248 University of California Publications in Zoology [Vol. 10 



is no question as to the identification. The white-throated swift 

 (Aeronautes melanoleucus) , was frequently seen in the same 

 place, occasionally at the same time that the black swifts were 

 under observation, and there was never any difficulty in dis- 

 tinguishing the two species. 



The black swifts were noted only during a week of cloudy, 

 showery weather; presumably they fed at other times at too high 

 an altitude to be seen from the valley. 



Chaetura vauxi (Townsend) 

 Vaux Swift 



.Migrating birds, heading for the coast through San Gorgonio 

 Pass, were seen daily in some numbers at Cabezon. May 10 to 

 lii. Otherwise observed only at Vallevista, where a single bird 

 was seen August 29, doubtless in the return migration. 



Two specimens were taken, at Cabezon. May 10 and 11 (nos. 

 1711, 1712). 



Aeronautes melanoleucus (Baird) 

 White-throated Swift 



An abundant species throughout the San Jacinto Mountains; 

 seen at practically every point visited, and doubtless breeding in 

 suitable spots in all parts of the range. White-throated swifts 

 were seen riving over the meadows in Ilemet Valley, over the 

 extreme summits of San Jacinto Peak and Toro Peak, the two 

 highest points in the mountains, and over the desert, below Palm 

 Canon, Snow Creek, and Cabezon. They were particularly 

 numerous in and about Deep Canon, in June, the extremely high 

 and precipitous enclosing cliffs supplying an ideal summer 

 habitat. 



Three specimens were preserved: an adult female. Cabezon. 

 May 12 (no. 1713). an adult female. Kenworthy, June 3 (no. 

 2285), and an adult male, Kernel Lake, August 10 (no. 3002). 

 The last is in the midst of the annual molt. 



