﻿74 



NORTH AMERICAN FAUNA. 



Average measurements of subspecies of MyoUs californicus. 



Subspecies. 



Locality. 



j2J CO 



ill 



californicus . 



ciliolahrum . 



mexicanus . 



California: Saratoga Springs. . . 



Death Valley . . 



Arizona: Oracle 



British Columbia: Massett 



Massett 



Kansas: Trego County 



Trego County 



Michoacan: Patzcuaro 



5cfcf 

 5 



5?? 

 Id' 

 9 



l$i 



5 



10 



77. 

 82 

 75 

 77 

 75 



80.2 

 81.5 



39 



38.8 



39 



34 



34.5 



34 



36.7 



38.: 



14.2 

 13.9 

 14.4 

 14 



13.8 

 15 



14 0 

 14.2 



31.3 4 

 31 4. 



32 

 32 

 32.1 



33 



4.1 

 4.2 



5 



4.3 

 6 



32.8 5.4 

 34. l! 4. 4 



58 

 55.4 

 57 

 54 

 54. 1 



14.2 

 12.9 

 14 



12.8 

 13.2 

 14 



14.6 

 14 



9.9 

 9.9 



10 



8 



9.5 

 9 

 10 

 9.G 



8 



8.3 

 7.5 

 7 



7.1 

 8.8 

 8.5 

 7.2 



' Type. 



MYOTIS NIGRICANS (Maximiliaa). 



1826. Vespertilio nigricans ^^Schinz, Thierreicli u. s. w., B. I, p. 179" Maximilian, 



Beitrlige zur Naturgesch. v. Brasilien, 11^ p. 266. 

 1878. Vespertilio nigricans Dobson, Catal. Chiroptera Brit. Mus., p. 319. 

 1893. VesjJertilio nigricans H. Allen, Monogr. Bats N. Am., p. 96. 



Type locality. — Fazenda de Aga, near tlie Iritiba River, southeastern 

 Brazil. 



Geographic distribtttion. — Tropical America, north to extreme south- 

 ern Mexico (Chiapas). Limits of range not known. 



General characters. — About the size of typical Myotis californicus^ but 

 with slightly larger foot and smaller ears; fur on back not distinctly 

 darker at base than at tip. 



Ears. — The ears are slightly smaller than in M. californicus^ but not 

 different in form. 



Membranes. — As in M. californicus. 



Feet. — The feet are relatively larger than in M. californicus, but smaller 

 than in If. yumaneyisis. Oalcar about as long as free border of uropa- 

 tagium, terminating in a small but distinct lobe; keel obsolete. 



Fur and color. — Fur short, that on middle of back averaging a little 

 less than 6 mm. in length, nearly unicolor on back but distinctly bicolor 

 on belly. Back clove brown (lighter than No. 2 on PI. Ill of Ridgway's 

 Nomenclature of Colors), the hairs just perceptibly darker at base and 

 with glossy tips, which in certain lights produce a slightly grizzled 

 appearance. Belly light broccoli brown, the basal half of the hairs 

 deep plumbeous. Ears and membranes blackish in dry skins. A series 

 of ten skins from Huehuetan, Chiapas, shows no variation in color. 



Slmll. — The skull of Myotis nigricans (figs, lie and 12a) is slightly 

 smaller than that of M. californicus, and has a shorter rostrum and 

 less frontal concavity in the dorsal outline. The differences are slight, 

 but very evident when series are compared. 



Teeth. — The teeth of Myotis nigricans do not differ appreciably from 

 those of M, californicus. 



