62 



420. *Chordeiles virginianus (Gmelin) — Nighthawk. 



The nighthawks breeding along the Missouri and a little westward 

 are very clearly of this form, which occurs during migration over the 

 eastern half of the state, but is not nearly so abundant as is sennetti 

 westward. Arrives the second week in May, breeds in early June, 

 departs before the middle of September. Omaha, Peru, Beatrice, 

 Lincoln, West Point. 



420a. *Chordeiles virginianus henryi (Cassin) — Western Nighthawk. 



This rufous form is the commoner one in Sioux county, though speci- 

 mens nearer sennetti also occur there. During migrations it extends 

 eastward about half way across the state, nocking with sennetti. 

 Indian creek, Warbonnet canyon, Harrison — breeding. 



420c. *Chordeiles virginianus sennetti (Coues) — Sennett Nighthawk. 



This is the nighthawk of the whole western two-thirds of the state 

 except in Sioux county where it is mostly replaced by and runs into 

 henryi; it occupies this region to the complete exclusion of the other 

 forms during the breeding season. It is the nighthawk of the sand- 

 hills, where its conspicuous paleness makes its identity unmistakable, 

 but eastward it intergrades with virginianus and is more difficult to 

 distinguish. Antelope, Holt, Rock, Cherry, Dawes, Thomas, Dundy, 

 Red Willow counties. 



EXTRALIMITAL : 418a. P. n.nitidus Brewster,the Frosted Poorwill, 

 occurs as a summer resident in western Kansas and eastern Colorado, 

 and may reasonably be expected in extreme southwest Nebraska, 

 though there is as yet no specimen from that locality. 



Family MICROPODID^E— Swifts 



1. Sooty, paler below, the throat gray, wings black ; tail rounded, spine 



tipped Chimney Swift, 



1. Black, under parts except the sides white; tail forked, not spiny. . . . 



White-throated Rock Swift. 



423. *Chaetura pelagica (Linnaeus) — Chimney Swift. 



Eastern portions of state only, west along northern border to Ne- ' 

 ligh, O'Neill, Atkinson, and probably Long Pine, but rare west of the 

 98th meridian. Arriving third week in April, breeding the latter 

 part of May, and departing second week in September. Locally very 

 abundant. Omaha, Lincoln, Beatrice, Peru, West Point, Niobrara. 



425. *Aeronautes melanoleucus (Baird) — White-throated Rock Swift. 



Sioux, Scott's Bluff, and Dawes counties, common summer resi- 

 dent and breeder in the high perpendicular cliffs of that region. (See 

 Carriker, Proc. N. O. U., Ill, pp. 81-83.) 



Family TROCHILID^E— Hummingbirds 



1. Throat metallic red; males (2) — not wholly metallic red; females. . . . (4) 

 2. Tail forked; outer primary broad, end turned inward; back 



golden green Ruby-throated Hummingbird. 



