100 U. S. NATIONAL MUSEUM BULLETIN 205 



Type Locality. — Old Fort Yuma, Imperial County, Calif., on right bank of 

 Colorado River, opposite present town of Yuma, Ariz. Range. — Intermontane 

 region of United States from south-central Washington south to Catavifia in 

 northeastern Baja California, and from southeastern California eastward to 

 southern Utah and northward in Utah to Tooele County (Durrant, Univ. Kansas 

 Publ. Mus. Nat. Hist., vol. 6, p. 51, Aug. 10, 1952) . 



Pipistrellus hesperus merriami (Dobson)f* 



1886. Vesperugo merriami Dobson, Ann. Mag. Nat. Hist., ser. 5, vol. 18, p. 24, 

 August 1886. 



1913. Pipistrellus hesperus merriami Grinnell, Proc. California Acad. Sci., 

 ser. 4, vol. 3, p. 279, Aug. 28, 1913. 



Type Locality. — Red Bluff, Tehama County, Calif, (not Locust Grove, Lewis 

 County, N. Y., as supposed by Dobson, op. cit., p. 125) . Range. — California 

 west of Sierra Nevada ; Sacramento Valley, San Joaquin Valley, and Coast Range 

 from San Francisco Bay south to San Diego County (Hall and Dalquest, Univ. 

 Kansas Publ. Mus. Nat. Hist., vol. 1, No. 26, p. 597, Jan. 20, 1950) . 



Pipistrellus hesperus australis Millerf * 



1897. Pipistrellus hesperus australis Miller, North Amer. Fauna No. 13, p. 90, 



Oct. 16, 1897. 

 1904. Pipistrellus hesperus apus Elliot, Field Colomb. Mus. Publ. 90, Zool. 

 Ser., vol. 3, p. 269, Mar. 7, 1904. (Providencia Mines, Sonora, Mexico. 

 Regarded by Burt, Univ. Michigan Mus. Zool. Misc. Publ. 39, p. 25, Feb. 15, 

 1938, as a synonym of Pipistrellus hesperus merriami. ) 

 Type Locality. — Barranca Ibarra, Jalisco, Mexico. Range. — Central Arizona 

 south to Jalisco, and including southern half of Baja California (Hall and Dal- 

 quest, Univ. Kansas Publ. Mus. Nat. Hist., vol. 1, No. 26, p. 597, Jan. 20, 1950) 



Pipistrellus hesperus potosinus Dalquest* 



1951. Pipistrellus hesperus potosinus Dalquest, Proc. Biol. Soc. Washington, 

 vol. 64, p. 105, Aug. 24, 1951. 



Type Locality. — Presa de Guadalupe, San Luis Potosi, Mexico. Range. — 

 Known only from western and central parts of San Luis Potosi, but probably 

 ranging over eastern part of Mexican Plateau. 



Pipistrellus hesperus maximus Hatfield* 



1936. Pipistrellus hesperus maximus Hatfield, Journ. Mamm., vol. 17, No. 3, 

 p. 261, Aug. 17, 1936. 



Type Locality. — Dog Spring, Hidalgo County, N. Mex. Range. — Southern 

 New Mexico, western Texas and probably adjoining parts of Mexico (Hall and 

 Dalquest, Univ. Kansas Publ. Mus. Nat. Hist., vol. 1, No. 26, p. 598, Jan. 20, 

 1950) . 



Pipistrellus hesperus santarosae Hatfield* 



1936. Pipistrellus hesperus santarosae Hatfield, Journ. Mamm., vol. 17, No. 3, 

 p. 261, Aug. 17, 1936. 



Type Locality. — Santa Rosa, Guadalupe County, N. Mex. Range. — In so far 

 as known, northern New Mexico and western Colorado. 



