PIPISTRELLUS. 



583 



Geogr. Distr. Lower California, Mexico, to western Texas. 



Genl. Char. Size small; ear reaching to nostril, short and rounded 

 at tip ; tragus curved forward at tip ; end of tail free of membrane. 



Color. Light yellowish gray, hairs plumbeous at base; between 

 fourth and fifth finger, the border of wing membrane is whitish; ears, 

 face muzzle, and membranes black. 



FIG. LXXXVI. PIPISTRELLUS HESPERUS. 



No. 10851 Field Columbian Mus. Coll. Trifle more than twice nat. size. 



Measurements. Total length, 72.8-79; tail vertebrae, 28-34.5; 

 tibia, 11-12.8; foot, 5-6; forearm, 28-32.5; thumb, 4; longest finger, 

 48-55.5; ear from meatus, 10-12.4; width of ear, 8.6-9.6; tragus, 

 4.6-5.4. Skull : occipito-nasal length, 1 1 ; zygomatic width, 7 ; width of 

 braincase, 6; occipital depth, 4. 



. apus (Pipistrellus) , Elliot, Pub. Field Columb. Mus., in, 1904^ 



p. 269. Zoology. 

 SWIFT BAT. 



Type locality. Providentia Mines, State of Sonora, Mexico. 



Genl. Char. About the size of P. hesperus, but quite different in 

 color, and with a larger foot. Larger than P. h. australis, the exact 

 color of which is not known. 



Color. Upper parts wood brown, base of fur blackish; under 

 parts pinkish brown; nose, space before and around eyes, wing, and 

 tail, membranes, feet, and ears black. 



Measurements. Total length, 72; tail vertebrae, 31.7; foot, 6.3; 

 forearm, 30.5; thumb, 4; longest finger, 47; ear from meatus, 10. 

 Skull: occipito-nasal length, 10.5; zygomatic width, 8; interorbital 

 constriction, 3; width of braincase, 6.5; palatal length, 5; post-palatal 

 length, to anterior rim of foramen magnum, 4; length of upper tooth 



