280 PROCEEDINGS OF THE ACADEMY OF 



results of value. In these particulars I am now no better prepared than at 

 any other time ; since but comparatively few specimens have reached me from 

 its localities, and all its types are to be seen only in European museums. But 

 having been compelled while studying the fauna of California to institute 

 comparisons between some of its members and those of the Mexican provin- 

 ces, to determine questions of distribution, I some time ago drew up a few 

 descriptions of forms, which I now think are new. These, together with 

 notes upon two bats from Aspinwall and Maracaibo, I propose to submit un- 

 der provisional names. Should any or all of them prove to be old species, 

 their descriptions can, without confusion, be appended to the original meagre 

 diagnoses, and may thus add to what little we know of these obscure animals. 



o. Inter femoral membrane relatively small ; each joint of tail a third shorter than 

 each of p ; terminal joint of tail exserted. Color of membranes and auricle blackish. 



V. mcndus, n. s. 



Fur above long and silky, and obscurely tri-colored ; basal third mottled grey- 

 ish-brown, with border toward skin whitish-grey ; apical third blackish-fawn, with a 

 tip of decided light dirty yellowish-brown. This tip hue is more marked toward 

 coccyx, and everywhere mingles with the blackish-fawn, so that the prevailing color 

 is seen to be mottled brown fawn, flecked with the lighter shade just men- 

 tioned. Beneath fur more bi-colored, base being blackish, with a faint white 

 line at root; tip being pale grey, verging to a whiter shade at pubis, where it is 

 almost uni-colored. The fur here also extends in a sparse degree nearly to the 

 region of the elbow. Head .less clothed than the other species. Base of foot 

 claws sparsely furnished with glistening brown hair. Auricle upright, nar- 

 row ; tragus subulate. External basal lobe of ear obscurely quadrate, rolled 

 inward at upper free border; tip of auricle bluntish ; external border very 

 slightly emarginate. Phalangeal callosity prominent, brownish. Wing mem- 

 brane to base of phalanges of toes ; small whitish tubercle at fibular side of ancle ; 

 membrane over calcareum also whitish. Membrane very small; interfemoral 

 membrane triangular; joints to the tail nine, the last free; nostrils oblique, pal- 

 mate ; lower border thin, upper border swollen. Teeth. Central incisors 

 placed obliquely to the dental arch, bicuspid, internal the larger ; lateral 

 placed at right angles to dental arch ; cusps of equal length ; molars |, most 

 probably in adult Inferior incisors overlapping ; lateral incisors quadrilobed. 



Measurements. 



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



" " body ll'" Height of auricle 5' 7/ 

 " " tail I'M-'" " " tragus 3 7// 



" " humerus l // -2 /// 2d joint index finger J _" 



" " thumb 1\'" Expanse 6 // -6 /// 



Young 9, No. 5#47, Museum of Smithsonian Institution. Alcohol. 

 Maracaibo, Ven. 



V. concisnus, n s. 



Fur above silky ; prevailing hue obscure chestnut -ft am. Indistinctly bi- 

 colored, basal half being brownish-black. Upper portion of interfemoral membrane 

 sparsely covered with fur of the same color. Beneath fur more distinctly 

 bi-colored, the basal half or two-thirds being as above; apical portion, hoicever, being 

 light greyish-brown, verging to yellow toward region of pubis and russet about the 

 neck. Head woolly, of nearly the same color as the fur of the back, somewhat 

 lighter, and in one specimen nearly uuicolored. The basal third of posterior 

 Burface of auricles furnished with unicolored light greyish-brown hair. 

 Upper lip yery faintly whiskered. Auricle erect, bluntish at tip ; internal 

 basal lobe acute, less so, however, than V. subulatus. External border very 

 faintly scooped out; external basal obscure, turned inward at upper border; 



[Aug. 



