582 PIPISTRELLUS. 
Hypsugo Kolenati, Allgem. Deutsch. Naturhist. Zeitg., Dresden, 
neue Folge, 11, 1856, pp. 131, 167-169. 
Nannugo Kolenati, Allgem. Deutsch. Naturhist. Zeitg., Dresden, 
neue Folge, 11, 1856, pp. 131, 169-172. 
Size small; skull delicate; braincase inflated; rostrum broad; 
ears longer than broad, tapering, tip rounded; tragus straight or 
curving forward; basal third of the back of interfemoral membrane 
hairy. 
Fic. 108. PIPISTRELLUS HESPERUS. 
No. 35739 U. S. Nat. Mus. Coll. 
2% times nat. size. Face enlarged 7 times. 
KEY TO THE SPECIES AND’ SUBSPECIES: 
A. Tragus curved forward. 
a. General hue light yellowish gray; longest PAGE 
PASEM AO 6G MOO. cies tans Wares eel ee ae peat P. hesperus 582 
b. General hue wood brown, longest finger,47 mm.P.h.apus 583 
c. General hue darker and browner; longest 
Anger 4 ea ering, alse sal ee P.h. australis 584 
B. Tragus straight. 
a. Back clove brown tinged with rusty, belly 
SIMOLY SRA Ws siete Ae an cee ete genes P. verecructs 584 
b. Above reddish brown, beneath paler......... P. vagans 584 
c. Upper and lower parts cinnamon....... P. cinnamomeus 585 
553. hesperus (Scotophilus), H. Allen, Mon. N. Am. Bats, 1864, p. 43. 
hesperus (Priptstrellus), Elliot, Syn. N. Am. Mamm., rgo1, p. 409. 
merriamt Dobson, Cat. Chiroptr. Brit. Mus., 1878, p. 228. 
WESTERN Bai. 
Type locality. Old Fort Yuma, San Diego County, California. 
EE 
