ff. Palpi feebly spatulate; apical cell of the wing narrowly open slightly before the tip; sternopleurals black, anterior bristle sometimes absent. H. ATRIPALPIS. Europe.
HaeMATOBOSCA Bezzi
dd. Vein R_{4+5} with setae at the base.[L]
e. Veins R_1 and R_{4+5} with setae at the base; two equally prominent sternopleural macrochaetae; arista with rays both above and below; palpi as long as the proboscis; apical cell of the wing wide open. L. TIBIALIS. (_Haematobia_ B. B. not R. D.). LYPEROSIOPS Town.
ee. Only vein R_{4+5} with basal setae; anterior sternopleural macrochaeta wanting; arista pectinate.
f. Palpi as long as the proboscis, the latter stout, with fleshy terminal labellae; apical cell narrowly open; sternopleural macrochaetae black. S. MACULOSA from Africa and related species from Asia. STYGEROMYIA Austen
ff. Palpi much shorter than the proboscis, the latter pointed at the apex, without fleshy labellae; apical cell of the wing wide open. S. CALCITRANS, the stable fly and related species. Widely distributed in both hemispheres (fig.
110). STOMOXYS Geof.
aa. Proboscis neither slender nor elongate, the labellae fleshy and not adapted for piercing.
b. Hypopleurae without a vertical row of macrochaetae. MUSCINae
c. Arista bare; distal portion of M_{1+2} broadly curved at the end; hypopleurae with a spa.r.s.e cl.u.s.ter of fine hairs. _S.
braziliana_, Southern States and southward. _Synthesiomyia_ B.
B.
cc. Arista pectinate or plumose.
d. Arista pectinate. _H. vittigera_, with the posterior half of the abdomen metallic blue. Mexico. _Hemichlora_ V. d. W.
dd. Arista plumose.
e. Middle tibia with one or more prominent setae on the inner (flexor) surface beyond the middle, or inner surface very hairy.
f. R_1 ends distad of the m-cu crossvein; M_{1+2} with a broad curve near its apical end. (= _Neomesembrina_ Schnabl. = _Metamesembrina_ Town). _M. meridiana._ Europe.
_Mesembrina_ Meigen
ff. R_1 ends proximad of the m-cu crossvein.
g. Eyes pilose, sometimes spa.r.s.ely in the female.
h. Female with two or three stout orbital setae; the hind metatarsus of the male thickened below at the base and penicillate. _D. pratorum._ Europe. _Dasyphora_ R.
D.[M]
hh. Neither s.e.x with orbital setae.
i. Abdomen without macrochaetae; arista plumose. _C.
asiatica._ Eastern Hemisphere. _Cryptolucilia_ B. B.
ii. Abdomen with strong macrochaetae; arista very short-plumose, nearly bare. _B. tachinina._ Brazil.
_Reinwardtia_ B. B.
gg. Eyes bare.
h. Body densely pilose; thoracic macrochaetae wanting; middle tibiae much elongate and bent; last section of M_{1+2} with a gentle curve. H. (_Mesembrina_) _mystacea, et al._, Europe and _H. solitaria_, N.
America. _Hypodermodes_ Town.
hh. Body not densely pilose.
i. Dorsocentrals six; last section of M_{1+2} with a gentle curve.
j. Inner dorsocentrals ("acrostichals") wanting; sternopleurals arranged 1:3. _P. cyanicolor_, _cadaverina_, etc. Europe and America _Pyrellia_ R. D.
jj. Inner dorsocentrals ("acrostichals") present; sternopleurals arranged 1:2. E. _latreillii._ North America. _Eumesembrina_ Town.
ii. Dorsocentrals five; inner dorsocentrals present; last section of M_{1+2} with a rounded angle; sternopleurals arranged 1:2. _P. cornicina_ Europe and America. (_Pseudopyrellia_ Girsch.) _Orth.e.l.lia_ R. D.
ee. Middle tibia without a prominent bristle on the inner surface beyond the middle.
[Ill.u.s.tration: 166. Pycnosoma marginale. (4.) After Graham-Smith.]
f. Squamula thoracalis broadened mesad and caudad as far as the scutellum.
g. Sternopleural macrochaetae arranged in an equilateral triangle; front of both s.e.xes broad; genae bare; dorsocentrals six, small; wing not rilled. (To COENOSINae). _Atherigona_ Rdi.
gg. Sternopleural macrochaetae when three are present, arranged in a right triangle.
h. Last section of M_{1+2} with a more or less rounded angle (fig. 163l).
i. Eyes of the male pilose or p.u.b.escent, of the female nearly bare; m-cu crossvein usually at or proximad of the mid-distance between the r-m crossvein and the bend of M_{1+2}. P. (= _Placomyia_ R. D.) _vitripennis_. _Plaxemyia_ R. D.
ii. Eyes bare; the m-cu crossvein always nearer to the bend of M_{1+2} than to the r-m crossvein.
j. Apex of the proboscis when extended reveals a circlet of stout chitinous teeth. P. INSIGNIS Austen, of India, bites both man and animals. (= _Pristirhynchomyia_.) PHILaeMATOMYIA Austen
jj. Apex of the proboscis without black teeth.
k. Eyes of male separated by a distance equal to a fourth the width of the head. House or typhoid fly. M. DOMESTICA L. Widely distributed. MUSCA L.
kk. Eyes of the male contiguous. E. CORVINA. Europe.
EUMUSCA Town
hh. Last section of M_{1+2} with a gentle curve (fig.
102).
i. Eyes pilose.
j. Claws in the male somewhat elongated; no orbitals in either s.e.x; antennae separated at the base by a flat carina; abdomen marked with red or yellow.
_G. maculata._ Europe and America. _Graphomyia_ R.
D.
jj. Claws short and equal in the two s.e.xes; two or three stout orbital macrochaetae in the female; R_1 scarcely produced beyond the r-m crossvein; eyes contiguous in the male. _P. obsoleta._ Brazil.
_Phasiophana_ Br.