If your season, your day, and your locality are all well chosen, you may reckon on a good six hours" work. At about four the b.u.t.terflies begin to lag, and then drop into their hiding places, one by one, till only a few of the late stragglers remain on the wing.
So far I have furnished some general instructions that may be regarded as preparatory to the start; but I will now give a few hints as to the mode of procedure when the day for field work has come.
First, see that you have secured _all_ your apparatus, and that it is in perfect condition. What is more annoying than to find, after you have travelled some miles to get to your hunting ground, that you have left your screw ferrule at home, or that the soldering of your metal Y is just giving way? If you are troubled with a short memory, it will be advisable to make out a list of every requisite for your field work, and keep this for reference on all field days.
Here is a list of your equipment for a day with the b.u.t.terflies. Net, ferrule or Y, stick, collecting box (the cork of which should be damped if the box is a metal one), a few "chip boxes" for live insects, killing apparatus, a good supply of pins of several sizes, a piece of string, needle and cotton, and your penknife.
You observe in this list one or two items not previously mentioned, since they hardly come under the category of apparatus, but a moment"s thought will convince you of their usefulness, especially in the case of a breakdown. If your net catches in a thorn--a very common occurrence--and a big rent is made, the needle and cotton will save you a deal of agony, and perhaps loss of temper. If your stick breaks under your exertions, the knife or the string may prove a most valuable companion. Your pins may be stuck in the cork of your collecting box, certainly the most convenient spot for immediate use; but you may also have a reserve store in a small pocket cushion, or arranged neatly on a strip of flannel which can be rolled up in the waistcoat pocket.
At last you are on the hunting ground, fully equipped but inexperienced, and at first find yourself just a little awkward in the use of your new gear. Your experience with the cap has been a very wide one, and you are possibly an expert at knocking down "Whites" in the streets and in your neighbour"s kitchen gardens. Now you have to wield the net, and coax your captives into your killing bottle; hence a slight feeling of incompetence at first.
You soon get over this, however, and within five minutes you may be seen furiously slashing away at all the poor b.u.t.terflies that come within range, common "Whites" and dingy "Browns" receiving as much attention at your hands as any rare gem that may happen to cross your path.
How different are the movements of an experienced collector! He walks stealthily along the route he has chosen, apparently taking but little notice of the majority of b.u.t.terflies that approach and pa.s.s him. He has already secured his "series" of nearly all the species, and is carefully on the watch for the gems that are required to complete his cabinet. His actions are slow and deliberate rather than rash; and he trusts more to his eyes than his legs.
The beginner may take to his field work quite to his own satisfaction, and may travel homeward with a feeling of great pride over his first day"s catch; but yet there are a few points in which a little advice may not be quite out of place, particularly so with regard to the management of the net, and the killing and pinning of the insects.
Most of the b.u.t.terflies may be caught on the wing, and it is far better to net them in the air than to sweep them off the herbage and flowers.
If these are rather low, you should strike the net smartly _upwards_ from below them, but of course this movement is impossible with insects that happen to be almost above your reach. If a b.u.t.terfly is busily engaged in searching out its sweet food, flying from flower to flower, don"t think of giving chase, but follow it up stealthily, and you will sooner or later get an opportunity of striking at it while in the air.
Sometimes, however, you will see a powerful flier making a straight dash across your field, taking no notice whatever of the fragrant blossoms, but evidently engaged on some important errand. If such happens to be a species you require, then you must run for it, but you will probably be satisfied with only a few chases of this kind, particularly if the sun is very hot, and the ground diversified with clumps of furze, heather, "molehills," and ditches.
There are times when your only plan of netting a b.u.t.terfly is to sweep it from a flower or leaf on which it has settled. If the vegetation is very low, you have simply to bring the net down upon it, and then, holding up the apex of the net with the other hand so as to give it room to fly, you can inclose it by grasping the lower part of the net as soon as the b.u.t.terfly has fluttered upward. If the herbage is tall it is advisable to strike either upward or sideways at the insect, starting it from the leaf or flower on which it rests; for if you bring _down_ the net you will have to inclose the whole or part of the plant on which the b.u.t.terfly has settled--a procedure that often ends in a torn net, or in the insect becoming damaged through being rubbed against the plant.
Whenever you capture a b.u.t.terfly by a sweep of the net through the air, you immediately turn the ring into a horizontal position, so that the bag of the net closes itself as it falls over the edge. This gives you an opportunity of examining the insect before you introduce your killing bottle. This is a very necessary precaution, for you are generally unable to judge of the condition of a b.u.t.terfly while on the wing, and in some cases you cannot even be certain of the species. If, then, you were to call the killing bottle into requisition for every capture you make, you would certainly find yourself taking the life of many an insect that is of no use whatever to you. Always examine your specimens at the moment they have been secured, at least as far as it is possible to do so, by looking through the gauze; and let your examination be as brief as possible, or some of the b.u.t.terflies that were at first in splendid condition will render themselves useless to you during their struggles to get away.
When satisfied that an insect is likely to be of value to you, keep it in the apex of the net by grasping the bag beneath it with the left hand, and then introduce the opened killing bottle with the other hand.
As a rule you will experience not the slightest difficulty in coaxing it into its trap, and then you quickly cover the mouth of the killing bottle with the gauze, then apply your left hand, using it as a temporary stopper for a few seconds, and now, the insect having been quieted, replace the cork.
A good killing bottle is almost instantaneous in its action, not only stupefying, but immediately killing the insects; and as soon as you are sure that each specimen is quite dead, you may pin it in your collecting box.
You must be cautious, however, on the one hand, that you do not take it out too soon. If you do you may find that it recovers from the mere stupefying effect of the poison, even after it has been pinned, and when you open your collecting box for the next b.u.t.terfly, you are horrified at the sight of the poor victim struggling to free itself.
On the other hand, don"t keep the insects in the killing bottle too long. If you do you will soon have a number, one lying on another, and all tumbled about together while you are on the chase. Of course, under such circ.u.mstances you are sure to damage them more or less.
Many collectors, although they may always use a killing bottle for moths, never employ one for b.u.t.terflies, but kill them by pinching the thorax. It is well to know how to do this, for it sometimes turns out to be a really quicker process than that we have just been considering; and, more than this, you can resort to it should you break or lose your bottle while in the field. It is done in this manner: Bring the two opposite sides of the net together, closing them on the insect so that it cannot flutter. If now the wings are brought together over the back, all is right, but if not, give it just a little room to flutter till you have the opportunity of closing the gauze upon it with the wings in the desired position. Now pinch the thorax smartly between the finger and the thumb, applying the pressure outside the net, but be careful not to squeeze the abdomen. In a moment you will find the insect quite dead, and not in the least damaged unless you performed the operation clumsily.
Now as to pinning. Hold the dead b.u.t.terfly between the finger and thumb of the left hand, and pa.s.s a pin of convenient size through the centre of the thorax above, and push it through so that the point appears centrally on the under surface. It is now ready for your collecting box.
So you work on till the sun begins to get low, and the b.u.t.terflies become fewer and fewer, till only a few stragglers of common species are to be seen. Still there are a few hours of daylight and perhaps even of bright sunshine before you, and if you are not weary with the work done, you may very profitably spend these hours in the collection and study of the habits of moths.
_Catching Moths by Day_
The reason for choosing the sunny hours for b.u.t.terfly collecting is obvious, all these lovers of brightness being then actively on the wing; and although many may be driven out of their hiding places by beating the herbage with the handle of your net, or even be searched out as they rest on stalks and leaves during dull days or at morning and evening twilight, yet such methods are comparatively tedious and unproductive.
Some moths also are lovers of sunshine, and while engaged in b.u.t.terfly hunting you will often meet with a moth flying briskly from flower to flower and taking its fill of both sweetness and brightness. Again, as you wade among flowery herbs in quest of b.u.t.terflies you will certainly disturb a number of moths, causing them to take a short flight in search of a safer spot. Thus you will almost invariably find a few moths among the contents of your collecting box even though you made no special effort to seek them out. But we shall now see how we may set to work to obtain a successful catch of moths at times when b.u.t.terflies are not so much in demand, or during the less brilliant hours of the day, when b.u.t.terflies are at rest.
The apparatus required for this work need not differ in any important respect from that recommended for b.u.t.terflies. The same net is used, any reliable killing bottle will do, and the pins and collecting box used for b.u.t.terflies are equally serviceable. But your mode of procedure is very different.
As you walk towards your proposed hunting ground you will do well to examine the trunks of trees, old walls, and wooden fences. In this way you will meet with moths fast asleep, which are consequently easily taken. All you have to do is to hold the open killing bottle obliquely just below the insect, and then push it gently downward with a small twig or stalk. As a rule the moth will drop direct into the bottle and make no attempt to fly away; but some are very light sleepers, ready to take flight at the slightest disturbance; and when dealing with these you must be careful to bring the mouth of the killing bottle so closely round them that there is no room for flight except into the bottle itself. It is well, however, not to take long at this kind of searching, but to reserve as much as possible of your time for what you consider to be a very favourable locality.
Speaking generally, a good locality for b.u.t.terflies is a favourable one also for moths, and you will do well to give special attention to well-grown hedges, especially those that surround clover fields; also overgrown banks, the borders of woods, open s.p.a.ces in woods, the trunks of isolated trees, gravel pits, and old chalk quarries.
Walk beside or among the undergrowth of woods, or among the tall herbage of waste places, tapping the branches and twigs with the handle of your net as you go. Then, if your locality is well selected, you will rouse moths to flight at almost every stroke. Some of these will shoot upward among the lofty branches and disappear quite beyond your reach; others will fly rather low and somewhat heavily, giving you favourable opportunities to try your skill with the net; others, again, will fly only a yard or so, and alight on a neighbouring leaf, often remaining so quiet that the killing bottle is easily made to inclose them.
There are moths that show a decided preference for large trees. These may be seen hovering about high branches during the evening twilight, and sometimes even in sunshine. In many such cases the chance of a capture seems hopeless, but occasionally one will descend so low that a watchful collector is able to secure it by a sweep of the net.
If at any time you are in a locality by day where you suspect the presence of certain species of moths at rest among the upper branches of trees, such branches should be beaten if possible to dislodge the insects they may shelter. A long stick will often serve this purpose well, and, failing this, a few stones thrown among the branches may prove effectual. In the case of small and rather slender trees, a kick against the trunk will set the whole in vibration sufficient to surprise all the lodgers; and the same effect may be produced with larger trees by giving each a good sound blow with a mallet or some other suitable implement.
This or any other plan of "beating" for moths is much more conveniently worked by two collectors together than by one alone; for one engaged in beating the herbage cannot be at the same time fully on the alert with the net. If two persons are together, one may take the lead, armed with the beating stick only, while the other, only very slightly in the rear, is always ready to strike.
We have said that b.u.t.terflies should always be killed in the field, but this plan is not so universally adopted with moths. Many collectors carry a large supply of pill boxes when going out for the latter and then take as many as they possibly can by boxing them direct in these.
This method of "pill-boxing" is very simple in the case of the lazy and soundly sleeping moths. It is only necessary to hold the open box below the insect, and then cause it to fall by pressing the lid down gently on it from above.
Many of the moths so caught will remain quiet in the boxes and can be taken home alive without much fear of damage. All may then be killed at the same time by packing all the pill boxes in some vessel of sufficient accommodation, and shutting them in with a little chloroform, ammonia, benzole, or other suitable poison. The vapour will soon find its way through the pores of the pill boxes, but, in order to make its action speedy, each one should have a few perforations in the lid.
Whatever advantages this method may give to the collector who works at night, when the process of pinning would be more or less tedious, there is no necessity for its adoption during the day. The large number of pill boxes required is certainly far more bulky than the single collecting box that would accommodate all the day"s captures; and although most of the insects boxed alive may be none the worse for the shaking they get, and may not damage themselves by fluttering in their small prisons, yet there is often a little loss on this score.
If you do adopt the pill-boxing method, be very careful that you do not mix the occupied boxes with the empties; and unless you fix on some definite plan for the prevention of such an occurrence, you will often find yourself releasing a prisoner from a box you have just opened to receive a new-comer.
Suppose that you start with all your empties in your right pocket. Then each one, as soon as it is tenanted, might be placed in the _left_, with the name of the insect, or any particular concerning it you would wish to note, pencilled on the lid.
When examining the trunks of trees you will be continually meeting with specimens of very small Moths--_Pyralides_, _Crambi_, _Tortrices_, and _Tineae_--and at first may find some difficulty in boxing or bottling such small and delicate creatures. A gra.s.s stalk will enable you to tip some of them into your killing bottle, but some are so snugly packed in crevices of the bark that it is almost impossible to get them out without damage, even with a thin and slender stalk. But a sudden puff of wind from your mouth will often be sufficient to dislodge them and blow them into your net, and from this they are easily transferred to a box or bottle.
These few hints will prove sufficient to start you on moth-hunting expeditions during the daytime, and will enable you to make good use of the dull days and cloudy hours when the b.u.t.terflies are quiet; but we must now turn our attention to the night work of the entomologist, and see how we may attract and catch moths during their hours of work and play.
_Searching for Moths at Night._
It is a well-known fact that the night-flying moths are attracted by lights, a characteristic of these insects that it is difficult to explain. Their love of darkness is in many instances so decided that they absolutely refuse to take flight while the fading light of day still lingers on the horizon, and even display a great aversion to the rays of the moon; and yet these very same species will often rush madly into the fierce glare of a naked artificial light, or fly with an energy almost amounting to fury against the gla.s.s of a street lamp or lighted window.
Puzzling as this peculiar tendency is, we can profitably turn it to our own account by making it a means of luring a number of moths into our presence.
The simplest way of putting this mode of capture into effect is to post yourself at your open window, with net and cyanide bottle at hand, while the brightest light you can command casts its rays as far and as wide as possible into darkness outside. If you use an oil lamp for the purpose, let it stand just inside the window frame, or, if a jointed gas bracket happens to be situated beside the window, bend it round so that the rays may pa.s.s over a wide area outside.
Two such lights are sometimes a very decided advantage--one quite outside the window to attract the moths from all possible points, and then another near the middle of the room to invite them inside. Whether you use either one or two lights, always see that it or they are so surrounded by a screen that the moths cannot by any possibility rush into the flame. There is nothing better for this purpose than a covering of light gauze, for this is not only a barrier for the prevention of the suicidal tendencies of the insects, but it also gives a good foothold to those who would like to rest and enjoy the luminous feast.
You will soon begin to learn that moths, like ourselves, exhibit great differences in their ways of enjoying their festal moments. Some will satisfy themselves by flying _near_ the light in almost a straight course, hardly slackening their speed as they pa.s.s; or will, perhaps, make a hurried curve round the light and then pa.s.s on at once about other business. To catch these you must be always on the alert, with net in hand, ready to make a dash at the right moment. But many will make straight for the flame, and then, finding a barrier in the form of gauze or gla.s.s, will either flutter round and round as if dissatisfied with your attempt to save them from an untimely end, or else settle quietly on the screen to enjoy the brightness for a long period. The flutterers are usually easily covered by a gla.s.s or the open cyanide bottle, and as for those that settle down quietly, you can take them at your leisure.
It will not do for a collector to depend solely on this method of obtaining moths, but at times when either his duties or the bad weather keeps him at home it affords him a means of capturing a few specimens that otherwise would have been missed. He may be even so busily engaged in other matters that he cannot afford the time to stand and watch with net in hand, but the insects that fly into his room and dance round the gas jet or inquisitively examine the white surface of the ceiling are easily netted or boxed without much loss of time.
The chances of success at this kind of work will vary considerably with the aspect, the season, and the weather. If your window opens on a large flower or fruit garden, on a patch of wooded country with plenty of underwood, a piece of waste ground overgrown with rank vegetation, or a stretch of heath or moor, then you may expect a very large number of visitors; but if you are situated on a level and barren country, or in the dense atmosphere of a thickly populated district, you must not reckon on many intruders.
As regards the season, this is more extended than that of the b.u.t.terflies. A few species of moths may give you a call during the bleak nights of October and November, and also during the somewhat less dismal nights of February and March; but from April to September you may rely on a goodly number of captures. Of course you will not expect many of the "rarities" and "gems" to find you out; these are to be searched for in the open field in the manner to be presently described; but your lights will attract a large number of the commoner species of _Geometrae_ and _Noctuae_, the former _chiefly_ during the early summer, and the latter more or less throughout the season.
A little experience will show you that the atmospheric conditions form a very important consideration. The dark and warm nights are the most productive. Very little luck is to be antic.i.p.ated when the full moon is throwing down her silvery rays from a clear sky; nor will you see many while a cold east or north-east wind is blowing. Under these conditions many moths prefer to keep in the sheltered nooks where they slept away the sunny hours of the day. They love a warm and moist air such as calls forth the odours of the fragrant blossoms that provide their sweets, and show no dislike to a fine drizzling rain that you yourself would prefer to avoid. A pelting shower will generally keep them under cover, but they delight in the fresh and moist air that immediately succeeds the pa.s.sing storm.
[Ill.u.s.tration: FIG. 50.--FRAME OF NET FOR COLLECTING INSECTS ON LAMPS AND WINDOWS.]