870 BIRDS OF ILLINOIS. 



the flat roof-tops of houses in cities, even in such densely populated 

 places as New York and Brooklyn. (See Louis A. Zerega, in Forest 

 and Stream, Vol. XVIII., No. 24, p. 467.) 



Cliordeiles virginianus henryi (Cass.) 



WESTEBN NIGHTHAWK. 



Chordeiles henryi Cass. Ulustr. B. Cal. Tex. &c. 1855, 239. BAIBD, B. N. Am. 1858, 153, 



922; ed. 1860 17; Cat. N. Am. B. 1859, No. 115. 

 Chordeiles popetue var. henryi ALLEN. B. B. & B. Hist. N. Am. B. ii. 1874, 404, pL 46, 



flg.4. 

 Chordeiles popetue henryi BIDGW. Nom. N. Am. B. 1881, No. 337a. 2d Check List, 1882, 



No. 400. 



Chordeiles virginianus var. henryi COUES, Key, 1872, 181. Check List, 1871, No. 267a. 

 HAB. Western United States (except Pacific coast north of San Francisco?). 



SUBSP. CHAB. Similar to true C. virginianus, but much paler and grayer, often with 

 much buffy mottling. 



This form, which is of occasional occurrence in Illinois, is in 

 habits and notes a counterpart of the ordinary eastern bird. In the 

 desert regions of the Great Basin the writer found it to be a com- 

 mon summer resident. 



