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NATURAL SCIENCES OP PHILADELPHIA. 283 



One individual 9- No. 5398 Mus. Smithsonian Institution. Alcohol. 

 Cape St. Lucas, Lower Cai. John Xantus. 



V. exilis, n. s. 



Fur : above, long, rich plumbeous two-thirds ; apical third pale russet yel- 

 low ; head and face surmounted with same ; conspicuous patch at basal half 

 interfemoral membrane. Venter same proportionate base of black ; apical 

 third paler yellow, running to white toward pubis ; small patch of same co- 

 lored fur at, base of interfemoral in front ; sparse hair runs on membrane 

 up to elbow ; thick labial fringe of dark brown hair running downward to 

 below level of lower jaw. Orbital wart also covered with prominent clump 

 of hair of same color. Auricle black ; external border slightly emarginate ; 

 internal basal acute; external basal prominent, equal sided; tragal lobe sa- 

 lient; nostrils scarcely elliptical; inferior border everted; lateral incisors 

 unicuspid; placed to central, as in other species; inferior incisors increasing 

 in thickness toward canines, lateral, most being obscurely quadrilobed (as in 

 other species ;) joints of tail nine, long, tip scarcely exsert. 



Measurements. 

 Length of head 6'" Length of foot 3'" 



" body l" Height of auricle G /// 



" tail V'V/r " tragus 2,\" f 



humerus 1"-A /// Length of 2d joint index finger ly" 

 thumb 2\'" Expanse *i\" 



One individual $. No. 5402 Mus. Smithsonian Institution. Alcohol. 

 Cape St. Lucas. John Xantus. 



V. TENUIDORSALIS, n. S. 



Fur very imperfect. Above, blackish basal two-thirds ; dark brown apical 

 third; below blacker basal two-thirds; reddish brown apical third; (belly 

 and membranes denuded.) Auricle and tragus as V. exilis. Nostrils very 

 elliptical ; thumb and foot barely large ; joint of tail nine ; tip not exsert. 



Measurements, 



Length of head 6$"/ Length of foot 2\" f 



" body 11"' " auricle 5"' 



" tail 1">3"' " tragus 3"' 



" humerus l"-3'" " 2d joint index finger V" 



" thumb 2'" Expanse 1"-1Q''J 



One individual 9- No. 5533 Mus. Smithsonian Institution. Alcohol. 



Cape St. Lucas, Lower Cal. John Xantus. 



V. YUMANENSIS. 



Auricle and tragus as 5402 ; external basal lobe quadrangular ; pale brown 

 nostrils. Sides of face swollen; joints of tail eight; tip not exsert. Fur: 

 Above, long, silky, basal two-thirds and black ; apical third pale russet 

 yellow, extending on to membrane from body one-third the distance to elbow. 

 A small patch of pale yellow hairs at basal half of interfemoral membrane. 

 Below, black at basal half, dirty white apical half; extending on membrane 

 nearly to elbow ; patch on interfemoral of smaller size than that above. La- 

 bial fringe thick, extending to below lower jaw. Warts also surmounted 

 with a prominent clump of hairs of a darker color. 



Measurements. 



Length of head 7'" Length of foot 2'" 



body 9"' Height of auricle Q'" 



1866.] 



tail l"-4'" " tragus 4" 



humerus l"-3 /// Length pf 2d joint index finger y" 



thumb 1\'" Expanse 9"-4'" 



