238 BULLETIN UNITED STATES GEOLOGICAL SURVEY. [Yol.Yl. 



Cooper considers it probable that this species winters in tlie canons, 

 thougli lie saw none at Fort Mojave until May, probably stragglers from 

 their favorite mountains. 



Cypseloides niger horealis (Kennerly) Eidgw. — Black Swift. 



This bird was found in the Yalley of the Truckee by Mr. Eidgway, 

 in a mutilated form, consisting of the sternum, wings, feet, and tail, 

 which were, as it is stated, the remains of an individual which had been 

 devoured by a hawk or an owl. This bird flies at great elevation, and, 

 as Dr. Cooper says, " like other swifts, flying habitually almost out of 

 sight, and rarely coming near the ground, except in cloudy weather, it 

 would very readily escape the attention of travellers in the West, how- 

 ever abundant it might be." 



Chcetura vauxi (Towns.) De Kay. — Yaux's Swift. 



"During our sojourn at the Truckee Eeservation, near Pyramid Lake, 

 in May and June, 1868, we saw, nearly every evening, but never until 

 after sundown, quite a number of small Swifts, which must have been 

 this species; but they always flew at so great a height that we found it 

 impossible to obtain a specimen in order to determine the species." — 

 (Ridgicay.) This bird is recorded from California by Dr. Cooper, and 

 Dr. Townsend also found it on the Columbia Eiver, and it is more than 

 probable that, from its geographical range, it may yet be found within 

 the State limits. 



CAPEIMULGID^. 



PJialwnoptilus nuttalU (And.) Eidgw. — Poor- will. 



This species, unlike the Eastern Caprimulgus vociferus, is, according 

 to both Mr. Eidgway and Dr. Cooper, an inhabitant of the sage-brush 

 country. I met with the bird several times, the first locality being in 

 the valley west of Hot Spring Cailon, on the road to Belmont. They 

 appeared rather frequently in the vicinity of Green Mountain district 

 and north of Mount Magruder. According to Mr. Eidgway, both sexes 

 incubate. 



Chordeiles popetue lienryi (Cass.) Allen. — Western Mghthawk. 



Was found south of Eureka, on the northern slopes of Prospect Hill. 

 Mr. Eidgway also found this species a common summer inhabitant over 

 the region traversed by him. 



Chordeiles acutipennis texensis (Lawr.) Eidgw. — Texan ll^ighthawk. 



The first of this species was observed by Dr. Cooper at Fort Mojave 

 on the 17th of April, soon after becoming quite numerous, hunting in 

 company after sunset, and hiding during the day on the ground under 

 low bushes. They flew like G. popetue, but sailed rather more in small 

 circles. 



