Fig. 1. Map showing the geographic ranges of species and subspecies of Pipistrellus.
1. [Pipistrellus h. hesperus] 5. [Pipistrellus h. santarosae]
2. [Pipistrellus h. merriami] 6. [Pipistrellus s. subflavus]
3. [Pipistrellus h. australis] 7. [Pipistrellus s. obscurus]
4. [Pipistrellus h. maximus] 8. [Pipistrellus s. veracrucis]

Pipistrellus hesperus hesperus (H. Allen)

Scotophilus hesperus H. Allen, Smithsonian, Miscl. Coll., No. 165, Vol. 7 (art. 1): p. 43, June, 1864.

Vesperugo hesperus True, Proc. U. S. Nat. Mus., 7:602, 1885.

Pipistrellus hesperus Miller, N. Amer. Fauna, 13:88, October 16, 1897.

Type locality.—Old Fort Yuma, Imperial County, California, on right bank of Colorado River, opposite present town of Yuma, Arizona.

Range.—Intermontane region of the United States from south-central Washington south to Cataviñá, Baja California, and from southeastern California eastward to southeastern Utah. Marginal occurrences (unless otherwise indicated, after Hatfield, Jour. Mamm., 17:258, 1936) are: Washington (Dalquest, Univ. Kansas Publ., Mus. Nat. Hist., 2:165, 1948): Maryhill; Vantage; Almota. Oregon: Watson. Idaho: 8 mi. W Rogerson (Davis, Mamms. Idaho, p. 120, 1939). Nevada: Middle Stormy Spring (Hall, Mamms. Nevada, p. 151, 1946). Utah: Goodridge. Arizona: 11 mi. NW Kayenta; Tinajas Altas. Baja California: Cataviñá; San José; Laguna Hanson. California: Dos Palmos Spring; Banning; Victorville; 12 mi. below (down river) Bodfish; Little Lake; 2 mi. S Benton Station. Nevada: 2 mi. NW Morgans Ranch; Deephole. Oregon: Princeton.