=Myotis californicus mexica.n.u.s= (Saussure)
California Myotis
1890. _V[espertilio]. mexica.n.u.s_ Saussure, Revue et Mag.
Zool., Paris, ser. 2, 12:282, July, type from an unknown locality, but Dalquest (Louisiana State Univ. Studies, Biol.
Ser., 1:49, December 28, 1953) restricted the type locality to the "desert (warmer part) of the state of Mexico, Mexico."
1897. _Myotis californicus mexica.n.u.s_, Miller, N. Amer.
Fauna, 13:73, October 16.
_Distribution in Tamaulipas._--Western mountains of state in pine-oak forest.
Only ten specimens of this species, five from Nicolas, two from Miquihuana and the other three, each from a different locality, have been reported from Tamaulipas. The specimen examined from 14 miles north and six miles west of Palmillas, a young female that still has deciduous incisors, was obtained on July 24. Of the five specimens from Nicolas, which represent the largest series of _M. californicus_ ever reported from eastern Mexico, some were caught in mist nets and others were shot over a water-hole.
_Measurements._--Five skins and four skulls from Nicolas afford the following measurements: 86.0 (80-94); 39.0 (36-41); 7.4 (7-8.5); 13.7 (13.5-14.0); length of forearm, 33.0 (31.8-34.2); weight, 3.6 (3-4) grams; greatest length of skull, 13.9 (13.8-14.1); least interorbital constriction, 3.2 (3.1-3.3); breadth of braincase, 6.5 (6.4-6.5); length of maxillary tooth-row, 5.2 (5.1-5.3); breadth across M3, 5.1 (5.0-5.3).
_Records of occurrence._--Specimens examined, 6: Nicolas, 56 km. NW Tula, 5500 ft., 5; 14 mi. N, 6 mi. W Palmillas, 5500 ft., 1.
Additional records: San Jose (Dice, 1937:249); Miquihuana (Miller and Allen, 1928:160); La Joya de Salas (Goodwin, 1954:5).
=Myotis nigricans dalquesti= Hall and Alvarez
Black Myotis
1961. _Myotis nigricans dalquesti_ Hall and Alvarez, Univ.
Kansas Publ., Mus. Nat. Hist., 14:71, December 29, type from 3 km. E of San Andres Tuxtla, 1000 ft., Veracruz.
_Distribution in Tamaulipas._--Tropical part of state, presently known only from two localities.
For taxonomic remarks concerning this bat see Hall and Alvarez (1961:72).
_Records of occurrence._--Specimens examined, 5, from 8 km.
W, 10 km. N El Encino, 400 ft.
Additional record: Cave in canyon of Rio Boquillas, 8 km. SW Chamal (Goodwin, 1954:6).
=Pipistrellus subflavus subflavus= (F. Cuvier)
Eastern Pipistrelle
1832. _V[espertilio]. subflavus_ F. Cuvier, Nouv. Ann. Mus.
Hist. Nat. Paris, 1:17, type locality restricted to 3 mi. SW Riceboro, Liberty Co., Georgia, by W. H. Davis, Jour. Mamm., 40:522, November 20, 1959.
1897. _Pipistrellus subflavus_, Miller, N. Amer. Fauna, 13:90, October 16.
_Distribution in Tamaulipas._--Presently known only from three localities, but probably occurs in most of eastern part of state.
Specimens examined are intermediate in color and measurements between _Pipistrellus subflavus subflavus_ and _P. s. veraecrucis_, but the color resembles that of individuals of _subflavus_ from Kansas more than that of specimens of _veraecrucis_ from Las Vigas, Veracruz.
The two males from eight kilometers west and 10 kilometers north of El Encino represent the southernmost record of the subspecies.
_Measurements._--External measurements of two males (58849, 58848) from 8 km. west and 10 km. north of El Encino and a male (60296) from Rancho Pano Ayuctle are, respectively, as follows: 78, 81, 83; 36, 38, 36; 10, 10, 9; 11, 11, 11; length of forearm, 33.1, 32.0, --; length of tibia, 14.6, 13.4, 13.0. Some cranial measurements of the two specimens from northwest of El Encino are: greatest length of skull, 12.8, 12.9; breadth of braincase, 6.5, 6.5; length of maxillary tooth-row, 4.0, 4.1.
_Records of occurrence._--Specimens examined, 3: 8 km. W, 10 km. N El Encino, 400 ft., 2; Rancho Pano Ayuctle, 6 mi. N Gomez Farias, 300 ft., 1.
Additional record: Matamoros (H. Allen, 1894:128).
=Pipistrellus hesperus potosinus= Dalquest
Western Pipistrelle
1951. _Pipistrellus hesperus potosinus_ Dalquest, Proc.
Biol. Soc. Washington, 64:105, August 24, type from Presa de Guadalupe, San Luis Potosi.
_Distribution in Tamaulipas._--Probably occurs throughout southwest part, but presently known only from Joya Verde.
The specimens reported herein were shot in July in a canyon that contained some standing water. According to the field notes of the collector (Schaldach), individuals of this bat in Tamaulipas flew later, in his experience, than bats of the same species in Sonora, Arizona and Coahuila, not emerging until it was almost fully dark.
_Pipistrellus hesperus_ from Tamaulipas is identified as _P. h.
potosinus_ owing to the dark color, but the averages of some measurements differ slightly from those given by Dalquest (1951:106) for _potosinus_ as follows: tail and ear shorter; foot larger; condylobasal length and cranial breadth less.
_Measurements._--Average and extreme external and cranial measurements of five males from Joya Verde are: 73.2 (70-75); 27 (26-28); 7 (7); 12.4 (12-13); length of forearm, 31.0 (29.5-31.5); greatest length of skull, 12.4 (12.2-12.8); condylobasal length, 11.8 (11.4-12.3); breadth of braincase, 6.3 (6.0-6.5). Corresponding measurements of three females (60204, 60209, 60210) from the same locality are: 72, 78, 76; 27, 33, 35; 7, 7, 7; 12, 12, 12; 31, 31, 32; 12.3, 12.9, 13.5; 11.7, 12.2, --; 6.0, 6.6, 6.1.
_Records of occurrence._--Specimens examined, 8, from Joya Verde, 35 km. SW Cd. Victoria, 3800 ft.
=Eptesicus fuscus miradorensis= (H. Allen)
Big Brown Bat
1866. _S[cotophilus]. miradorensis_ H. Allen, Proc. Acad.
Nat. Sci. Philadelphia, 18:287, type from Mirador, Veracruz.
1812. _Eptesicus fuscus miradorensis_, Miller, Bull. U. S.
Nat. Mus., 79:62, December 31.
_Distribution in Tamaulipas._--Southern part of state, north at least to Miquihuana.
Specimens from Miquihuana, Palmillas, and Nicolas were shot in flight at dusk; those from the Sierra de Tamaulipas were collected in a mist net. Five females, all taken in June, were lactating.
Judging from Hall and Kelson"s (1959:185) distribution map for the species, two subspecies, _E. f. fuscus_ and _E. f. miradorensis_, possibly occur in Tamaulipas, the former in the north and the latter in the south. Comparison of specimens presently available from the state (all from the southern part) with typical individuals of the two subspecies mentioned reveal that they resemble _miradorensis_ to a greater degree than _fuscus_ and they accordingly are a.s.signed to the former. In measurements, the Tamaulipan specimens agree closely with _miradorensis_; in color, some resemble _miradorensis_ but others approach _fuscus_, possibly indicating intergradation between the two subspecies in the material at hand. Probably _E. f. fuscus_ will be found in the northern part of the state.
_Measurements._--Average and extreme measurements of nine females from the Sierra de Tamaulipas and three males, two from Miquihuana (55137, 55138) and one from Palmillas (55139), are respectively: 121.3 (111-127), 115, 107, 115; 51.9 (50-56), 50, 45, 52; 10.9 (9.5-11.0), 10, 10, 11; 17.8 (17-18), 18, 18, 18; length of forearm, 49.6 (48-52.6), 48.9, 49.1, 49.1; length of tibia, 18.8 (18.2-19.3), 20.5, 17.3, 18.0; condylobasal length, 18.9 (18.5-19.3), 19.3, --, 18.8; zygomatic breadth, 13.1 (12.7-13.5), --, 13.0, 13.3; interorbital constriction, 4.2 (3.7-4.4), 4.0, 4.3, 4.1; length of maxillary tooth-row, 7.3 (7.1-7.5), --, 7.2, 7.2.
Five lactating females weighed 20 (17-23) grams, and three males 17.5 (17-8) grams.