80 



PACIFIC COAST AVIFAUNA 



No. 14 



tin County, several on July 20-21, li)()9, one secured -luly 21 (Saiuiders, IDlla, 

 p. 38) ; Poison, one heard July 26, 1915 (Saunders, l!)l(ie, p. So) ; rare at Bill- 

 in<i's (Thomas, MS). 



Cameron states that this species arrives in May and leaves in August. A 

 specimen from Miles City, dated May 11, 1902, taken by C. F. Hedges, is in the 

 collection of the University of Montana. 



This species nests in June, a nest being found by Cameron, June 26, 1907, 

 at Knowlton. He also states that the young fly by August 21, Silloway states 

 tluit this species nests early in June in Fergus County. 



161. Chordeiles virginianus hesperis Grinnell 



Pacific Nighthav^^k 

 An a])undant summer resident in the western half of the state, ranuing east 





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Fig. 18. Pacific Nigiitiiawk incuhatixg hei? k(;c;s. Nksi' ox a bed ok moss, .\k\i{ Heetox. 

 Photo by A. D. DuBois. 



to llie western edge of the prairie region. Replaced by soDicKi eastward. Th(> 

 easternmost places where this form has ])e('n rc^ported ai'c .MiTk liivei-. Sun River 

 and Great Falls in the breeding season, and Johnson Lake, Valley County, in 

 migration (Oberholser, 1914, j). 50). Reported conunon or abundant in all pai'ts 

 of the state except the iiig Hole Basin, whei'e it is rare, only one hii'd being seen 

 in a season's work (Forrest, 1914, p. 195). 



This species is one of the latest birds to arrive in spring, the date usually 

 being in the first week of .lunc it leaves in late August or cai'lN' Scptcnibcf. 



