A MONOGRAPH OF THK BATS OF NORTH AMEHTCA. 91 



the foroanii 33""", the tibin 17A"'"', tlie foot 7'""', tlie licad and Ixxly 

 41"'"', and the tail IV.)""". The central incisor sti<)ii<;]y iucliiied inward, 

 hiteral giving the appearance of divergin.ii' incisors. Ears scarcely 

 emarginate, external basal h)be higlier than broad, membranes bhiek, 

 Sluice beneath lower jaw not white. Tliis is the tyi)ical V. erotis of 

 the monograph. It would certainly be a distinct valid species if the 

 southern forms did not show teudeucies toward V. albescens. 



Var. ()))• Vespertilio albescens melanorhinus (Mciriiim). 



Vtupcriilio mt'laitorhinus MiTriani, N. A. Fauna, No. 3, 1890, IG. 



The following is an abridgment of the original descrii)tion of V. 

 melanorhinus: 



(llandular prominence between eyes and nose inconspicuous; tail a 

 little longer than head and body, the extreme tip projecting, ears 

 shorter than head, shallow external emargination ; tragus long and 

 slender, directed forward and outward ; convex at lower two-thirds, 

 and then rapidly becomes narrower, aud is sinuate and slightly con- 

 cave on upi)er third. Thumb about half as long as the foot. Foot 

 medium. Interfemoral membrane furred above to a little beyond the 

 middle of tibia; postcalcaral lobe small but distinct; upper part uni- 

 form, dull golden brown, except the lips and face below and in joint of 

 eyes, which parts are abruptly black; under part paler, palest pos- 

 teriorly. Ears, face, and niem'l)ranes black; underfur everywhere 

 blackish, allied to T". ciliolahrum, from which it differs in having shorter 

 ears and longer legs and tail, as well as in color. 



No. 18684, (^ , San Francisco Mountain, Arizona, forearm, 31"""; 

 thumb, 4"'"'; foot, 0"""; head and body, 41"'"'; tail, 41"""; tip delicate, 

 scarcely exsert. 



The following embraces a study of the type of V. melanorJiimis: 



Millimeters. 



First phalaux, third digit UH 



Second plialaux, third digit 10^ 



First phalanx, fourth digit 8 



Second phalanx, fourth digit 8 



First phalanx, tifth dipit 8 



Second phalanx, fifth digit 6 



Basal, half of auricle furred. Basal, three-fourths of fur above deep 

 black; apical fourth, bright shiny golden brown. The interfemoral 

 membrane thickly furred to knees and sparsely so almost to ankles. The 

 proportions of basal black diminishes toward the rump, but the hair 

 even on the interfemoral is obscurely bicolored. Basal, three-fourths 

 below black; apical, fourth white with a slight mixture of a tawny 

 shade. The interfemoral membrane ch»thed nearly to the knee with 

 the same character of hair as on the neck, chest, and abdomen; but the 

 basal proportion of black diminishes in ])ro])ortion. Under surface of 

 lower jaw not white. The prepuce blackish. 



