Order CHIROPTERA: Bats 



Family VESPERTILIONIDAE, Common Bats 

 SubfamUy VESPERTILIONINAE 



FORT YUMA BAT 



MYOTIS YUMANENSIS (H. Allen) 

 Vespertilio yumanensis H. Allen, Monogr. N. Am. Bats, p. tio, 



1864. 

 Vespertilio macropus H. Alle^ Proc. Acad. Nat. Sci. Phila., 



p. 288 (nee Gould, 1854) 1866. 

 Vespertilio nitidus (pedomorphic variety) H. Allen, Monogr. 



Bats N. Am., pp. 72-73, 1893. 

 Vespertilio albescens H. Allen, Monogr. Bats. N. Am. p. 87, 



(part, nee Geoff., 1805) 1893. 

 Vespertilio nitidus macropus H. Allen, Monogr. Bats. N. Am., 



p. 100, 1893. 



Description — Size small length 74-88min. ; forearm 32-37 

 mm. ; calcar distinct, considerably longer than free border of 

 interfemoral membrane, terminating at a well-marked lobule; 

 free border of uropatagium naked; ears moderate; wings 

 from base to toes, but on account of extent of web between 

 toes apparently from side of metatarus ; feet very large and 

 ong as compared with other small American species. 

 Ears: The ears are moderately long; laid forward they 

 reach straight for a short distance at base, then strongly 

 convex, and finally straight or even slightly concave just 

 below; tip. The tip is narrow and abruptly rounded off. 

 The posterior border is concave from^ the tip to the widest 

 part of the auricle, just below mid height, then strongly 

 convex to basal notch, which isolates a well-marked lobe. 

 The fur shows no peculiarities in distribution. On the mid- 

 dle of the ba,ck it averages about 6 mm. in length. Color 

 pale wood brown, varying to broccoli brown; belly dirty 

 whitish; the fur everywhere light plumbeous at base; ears 

 and membrane light brown; the uropatagium and wing 

 membranes edged with whitish. (Miller.) 



Distribution — Austral zones and lower edge of Transi- 

 tion zone from the southwestern United States to San Luis 

 Potosi and Michoacan, Mexico. In Utah specimens have 

 been taken at Provo. 



