﻿90 



NORTH AMERICAN FAUNA. 



Ysabel, 8an Diego Connty, 18; Three Rivers, 7; Twin Oaks, 2; Yallecitas, San 

 Diego Comity, 3 ; Wliitewater, 1 (skiu) ; Yosemite Valley, 1 ; Old Fort Yuma, 

 1 (type). 

 Colorado: Grand Junction, 4. 



Lower California : San Fernando, 7 (Miller coll.). 



Nevada: Gold Mountain, Esmeralda County, 1; Paliranagat Valley, 1; Vegas 



Mountains, 1; Vegas Valley, Lincoln County, 1. 

 New Mexico: Dog Spring, Grnnt County, 7 (skins) ; Fort Wingate, 1; Grant 



County, 1 (skin). 



Texas: Cliinate Mountains, 1; El Paso, 4 (1 skin); Paisano, 5; Pecos River, 1. 

 Utah : St. George, 2. 

 Washinton: Almota, 1. 



General remarlcs. — Pqristrellus liesperus is readily distinguisliable 

 among i^ortli Americau bats by its dental forraula, small size, blunt 

 tragus, and i)allid color. It needs no comx^arison with any other species. 

 At the southernmost extremity of its known range a subspecies slightly 

 different from that occurring farther north has been differentiated. 

 Otherwise the species is remarkably constant in all its characters. 



PIPISTRELLUS HESPERUS AUSTRALIS subsp. nov. 



Tj/pe from Barranca Ibarra, Jalisco, Mexico; altitude about 3,000 feet. Adult 9 (in 

 alcohol), No. 52112, U. S. National Museum (Biological Survey collection). Col- 

 lected May 14, 1892, by E. W. Nelson. Original number, 2614. 



General characters. — Slightly smaller than true Pipistrellus hesperus; 

 fur shorter; color apparently darker and browner. 



JEars, memhranes, and feet. — As in the typical subspecies. 



Fur and color. — The fur is shorter than in specimens of true hesperus 

 taken in Ai>ril and May, but in distribution it shows no i^eculiarities. 



Color darker and browner than in specimens of true hes2)er us that 

 have been immersed in alcohol for a similar length of time. Until skins 

 of the southern animal are examined the actual color differences between 

 the two forms can not be determined. 



Measurements. — The measurements of the type and the averages of 

 four specimens from the type locality are given in the table of measure- 

 ments on page 95. 



Specimens examined. — Four, all from the type locality. 



General remarls. — Pipistrellus hesperus austraUs is a fairly well 

 marked subspecies characterized by slightly smaller size, shorter fur, 

 and darker color than in the typical form. The material by which it is 

 represented is so poor, however, that all the characters can not be 

 determined with certainty. 



PIPISTRELLUS SUBFLAVUS (F. Cuvier). Georgian Bat. 



1832. IVespertilio (jeorgianus F. Cuvier, Nouv. Ann, Mus. d'Hist. Nat., Paris, p. 16. 

 (Not determinable.) 



1832. Vespertilio stthflavus F. Cuvier, Nouv. Ann. Mus. d'Hist. Nat., Paris, p. 17. (De- 

 scription good. ) 



1835-41. Vespertilio erijtlirodactyhis Temminck, Monogr. de Mamm., II, 13me Monogv., 

 p. 238. 



1864. Scoto2)hUus georgianiis II. Allen. Monogr. N. Am. Bats, p. 35. 



