582 



PIPISTRELLUS. 



Hypsugo Kolenati, Allgem. Deutsch. Naturhist. Zeitg., Dresden, 



neue Folge, n, 1856, pp. 131, 167-169. 

 Nannugo Kolenati, Allgem. Deutsch. Naturhist. Zeitg., Dresden, 



neue Folge, n, 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. 



A. 



B 



FIG. 108. PIPISTRELLUS HESPERUS. 



No. 35739 U. S. Nat. Mus. Coll. 

 z% times nat. size. Face enlarged 7 times. 



KEY TO THE SPECIES AND SUBSPECIES. 



Tragus curved forward. 

 General hue light yellowish gray; longest 



finger, 48-55.5 mm P. Hesperus 



General hue wood brown, longest finger, 47 mm . P. h. apus 



General hue darker and browner; longest 



finger, 45-47 mm P. h. australis 



Tragus straight. 



a. Back clove brown tinged with rusty, belly 



smoky gray P. vercecrucis 



b. Above reddish brown, beneath paler P. vagans 



c. Upper and lower parts cinnamon P. cinnamomeus 



PAGE 



582 

 583 



584 



584 

 584 



585 



553. Hesperus (Scotophilus), H. Allen, Mon. N. Am. Bats, 1864, p. 43. 



hesperus (Pipistrellus) , Elliot, Syn. N. Am. Mamm., 1901, p. 409. 



merriami Dobson, Cat. Chiroptr. Brit. Mus., 1878, p. 228. 

 WESTERN BAT. 



Type locality. Old Fort Yuma, San Diego County, California. 



