1913] Grinnell-Swarth: Birds and Mammals of San Jacinto 249 



Archilochus alexandri (Bourcier & Mulsant) 

 Black-chinned Hummingbird 



Seen at but a few points, and usually in limited numbers. 

 Single birds (adult males, and hence easily recognized) were 

 noted at Dos Palmos, the last week in May, at Strawberry Valley, 

 July 10, and at Hemet Lake, August 15. The only locality where 

 many were seen was at Hurley Flat, 3500 feet, situated on the 

 north side of the mountains, southwest of Cabezon. Here, on 

 May 9, they were numerous. 



Two specimens, both adult males, were collected, one from 

 Hurley Flat, May 9 (no. 1766), and one from Schain's Ranch, 

 June 21 (no. 1963). 



Calypte costae (Bourcier) 

 Costa Hummingbird 



By far the most abundant species of hummingbird in the 

 lower parts of the mountains, ranging upward to extreme upper 

 Sonoran, Schain's Ranch. 4900 feet, being the highest point of 

 record. They were fairly common in the brushy hills at Ken- 

 worthy, and also about Cabezon at the north base of the moun- 

 tains, but on the desert side of the range, at Dos Palmos and 

 Palm Canon, they fairly swarmed in places. Here, in May and 

 June, they were frequenting the thickets of desert willow (Chil- 

 opsis), at that time in full bloom. Most of the birds seen at 

 these latter points were young of the year. But very few 

 hummingbirds were seen at Dos Palmos upon our later visit, 

 in August. 



Nests were found at Cabezon. May 9, with eggs, May 14. 

 building. May 16, with young, and at Kenworthy, May 24, with 

 eggs. 



Thirty-seven skins of the species were collected, as follows : 

 Cabezon. six (nos. 1760-1765), Whitewater, two (nos. 2068, 

 2069), Banning, one (no. 2048), Schain's Ranch, thirteen (nos. 

 1842-1854), Kenworthy, three (nos. 2346-2348), Dos Palmos, 

 eleven (nos. 2545-2555), Palm Canon, one (no. 3086). 



