582 PIPISTRELLUS. 
Hypsugo Kolenati, Allgem. Deutsch. Naturhist. Zeitg., Dresden, 
neue Folge, 11, 1856, pp. 131, 167—169. 
Nannugo \xolenati, 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 LO) GE SPECIES AND) SUBSPECIES: 
A. Tragus curved forward. 
a. General hue light yellowish gray; longest PAGE 
ee NTS PNE Pe 7 ER P.hesperus 582 
b. General hue wood brown, longest finger,47mm.P.h.apus 583 
finger, 48-55.5 mm 
c. General hue darker and browner; longest 
Met: ASA manos, he oe Ne ae re a P.h. australis 584 
B. Tragus straight. 
a. Back clove brown tinged with rusty, belly 
Smokey STay: sok Piet at ae es See P. verecrucis 584 
b. Above reddish brown, beneath paler......... P. vagans 584 
¢, Upperand lower parts cinnamon>...-> - P. cinnamomeus 585 
553. hesperus (Scotophilus), H. Allen, Mon. N. Am. Bats, 1864, p. 43. 
hesperus (Prptstrellus), Elliot, Syn. N. Am. Mamm., 1901, p. 409. 
merriamt Dobson, Cat. Chiroptr. Brit. Mus., 1878, p. 228. 
WESTERN Bat. 
Type locality. Old Fort Yuma, San Diego County, California. 
