870 BIBDS OF ILLINOIS. 



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

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

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



Chordeiles virginianus henryi (Cass.) 



WESTEBN NIGHTHAWK. 



Chordeiles henryi Cn»t>. Ilhistr. li. Cul Tox. &>■. ISS.'.. iS9.-lUlBD. B. N. Km. 1858. 153. 

 9iS!; vd. 1860 17; Cut. N. Am. B. 1W9. No. 115. 

 Chordeiles popehte var. henrui .\i.i.en.— B. B. Jk K. Hint N. .\m. B. 11. \X7t. 4''4. pi. 46, 



ag.i. 



Chordeiles popelue henryi Rroow. Nom. N. .\m. B. 1881. No. 33<n.— 2d Chock List, 1882, 



No. 4tK). 

 Chordeiles viroiniantis var. /ip)in/i CouES. Key, 1872. 181.— Chpc-k List. 1871, No. 267(i. 



Had. Westorn United States (except Pacific coast north of San Francisco?*. 

 SuBsr. Chab. Similar to true C. ciroinianus, but much paler and grayer, often with 

 much bulTy mottling. 



This form, which is of occasional occurrence hi Ilhnois, is in 

 habits and notes a counterpart of the ordinaiy easttm bird. In the 

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

 mon summer resident. 



