86 PACIFIC COAST AVIFAUNA No. 11 
259 (425) Aeronautes melanoleucus (Baird) 
WHITE-THROATED SWIFT 
Synonyms—Panyptila melanoleuca; Cypselus saxatilis; Micropus melan- 
oleucus. 
Status—Common summer visitant locally east and south of the northern 
humid coast belt, chiefly to mountainous portions of Upper and Lower Sonoran 
zones. Occurs on the Santa Barbara Islands and north along the coast to Santa 
Cruz County. Numerous interiorly throughout the San Diegan and desert re- 
sions; north less commonly along the Sierra Nevada as far as Mount Shasta (C. 
H. Merriam, N. Amer. Fauna no. 16, 1899, p. 117), and along the imner coast 
ranges to Mount Diablo, Contra Costa County (Cohen, Condor, v, 1903, p. 119). 
While nesting chiefly or altogether below Transition, the birds forage far and 
wide even over the highest peaks. Remains in varying numbers through the 
winter in the San Diegan district, where recorded at that season as far north 
as Ojai Valley, Ventura County (A. K. Fisher, N. Amer. Fauna no. 7, 1893, p. 
55); also Paicines, San Benito County, in January (J. and J. W. Mailliard, MS) 
and in the vicinity of Salton Sea, January (Van Rossem, Condor, xm, 1911, p. 
132). 
260 (429) Archilochus alexandri (Bourcier and Mulsant) 
BuAcK-CHINNED HUMMINGBIRD 
Synonym—Trochilus alexandri. 
Status—Common summer visitant to Lower and Upper Sonoran zones both 
east and west of the Sierran divide. Recorded as breeding west of the Sierras 
as far north as lower McCloud River, Shasta County (Townsend, Proce. U. S. Nat. 
Mus., x, 1887, p. 207). Apparently most abundant in the San Diegan district. 
East of the Sierran divide, breeds along the Mohave River (Coues, Proc. Acad. 
Nat. Sci. Phila., 1866, p. 56), along the Colorado River (J. Grinnell, Univ. Calif. 
Publ. Zool., xm, 1914, p. 143), and in. Owens Valley (Bendire, Life Hist., m, 
1895, p. 198), and reeorded, perhaps casually, north to Honey Lake and Camp 
Bidwell, in the extreme northeastern corner of the state (Henshaw, Rep. Wheeler 
Surv., 1879, p. 312). Noted in the coast region of west-central California casu- 
ally north to the San Francisco Bay region: Haywards, Alameda County (J. G. 
Cooper, Amer. Nat., x, 1876, p. 90); San Geronimo, Marin County (J. Mail- 
lard, Condor; xv, 1913, p. 43). Winters sparingly on the Colorado Desert: 
Palm Springs, December (J. Grinnell, Condor, v1, 1904, p. 42). 
261 (430) Calypte costae (Bourcier) 
Costa HuMMINGBIRD 
Synonyms—Atthis costae; Trochilus costae; Selasphorus costae. 
Status—Common summer visitant to the Lower Sonoran zone, in the San 
Diegan district northwest to Santa Barbara (J. Mailliard, MS), on the Colorado 
and Mohave deserts, and, northeast of the Sierras, through the Panamint Moun- 
tains and Owens Valley (A. K. Fisher, N. Amer. Fauna no. 7, 1893, p. 56). 
Rare north of the 35th parallel west of the Sierras: recorded casually from 
