102 BULLETIN 43, UNITED STATES NATIONAL MUSEUM. 



as head and body, ample, couvex on sides; interfemoral membrane is 

 sparsely liaired to ankles above. 



The npi)er first and second njiper premolars are invisible from with- 

 ont; ears furred at basal one-half; tragus witli distinct spine at upper 

 border of the basal notch, and crenulated near tip. In all the forms 

 the hair on the interfemoral membrane almost to the ankle; forearm, 

 30'" ; hair deep black at base ; light golden yellow to light brown above ; 

 white beneath. 



The following list includes the specimens of this subspecies in the 

 collection of the Agricultural Department : 



27054 9 Yega.s VaJley, Nevada. 



27055 9 Pabrnmp Valley, Nevada. 



270.56 <? Colorado Eiver, Lincoln County, Nev. 



27059 S Death ^'alley, California. 



27060 ^ Dea^i Valley, California. 

 27058 ^ Death Valley, California. 



27061 ^ Death Valley, California. 

 27051 ^ Amargosa Eiver, California. 



30731 9 East Fork Keweak River, California; dark chestnut brown above, 



light buff beneath. 

 30730 9 Ihid. 



In specimen No. 2786 9 and No. 2787 S collected by E. Coues at Fort 

 Whipple in 1802, the outer margin of the ear scarcely concave, first 

 scallop not sharply defined above; external basal lobe thick, rigid, 

 sharply incurved. All parts of body and of membranes delicate, 

 facial i)roportions slender, nose pointed. Interfemoial membrane above 

 sparsely haired almost to ankle; post calcaral well developed ; apici 

 calcaral long, i^rojecting. Tail 19'" to ankle; 17'" from ankle to tip; tip 

 not exsert. Tail in 2780 straight to within three segments of end, 

 then it is abruptly flexed. In 2787 it is curved throughout as in Ves- 

 pertiUo generally, and the apici-calcaral not projecting; post calcarals 

 absent. 



Here, in two examples, tlie contrast as to the lobes about the calcar 

 and the shape of the tail is marked. The degree of hairiness on the 

 upper surface of the interfemoral membrane is the same in the two 

 sexes. I can not distinguish this form by any valid character from a 

 group of specimens (five in all, 18770 to 18780, all females) in the col- 

 lection of the Agricultural Department, from Oracle, near Tucson, Ariz. ; 

 one of these, No. 18778, is taken as a basis for the following notes: 



Basal lobe not thickened at free border, scarcely incurved; the post 

 calcaral lobe a mere hem ; the membranes are not black; the glands 

 on the side of the face swollen, ovate mouth cleft, not reaching the 

 posterior canthus; the thumb 4'" long; the foot 5'" long; the head and 

 trunk 38'"; the tail 35"" long, longer than body; forearm 30'". 



These examples are nearly identical with skins of E. Cones from Fort 

 Whipple. Very light chestnut brown above, white beneath the jaw; 

 tragus semipyriform ; lateral incisor small and parallel to central 

 interfemoral membrane, milky in front. This group of individuals 

 exhibit characters combining those of T". albescens and V. nitidus. A 



