BIRDS CAPEIMULQIDAE CHOEDEILES HENETI. 



153 



As a summary of the whole subject, I am inclined to think that all the varieties described 



belong to one species, varying somewhat with the locality, those from the Atlantic and, perhaps, 



Pacific regions being darkest, without much mottling ; those from the interior province, or from 



the Missouri to the Rocky Mountains, being much more varied, with a tendency to pale grayish 



tints in northern localities, and reddish in more southern, the latter of smaller size. In this 



generalization I would scarcely except the G. henryi. The G. texensis is, however, quite 



different. 



List of specimens. 



CHOEDEILES HENRYI, Gas sin. 



Western Night-Hawk. 



Chordeiles hemt/i, Cabsik, Illustrations,*!, Jan. 1855, 333. 



Sf. Ch. — F«male similar to C. virgmiamis, but the upper parts much more mottled and more rufous, 

 Hab. — Rocky Mountains of New Mexico. 



The specimens hitherto collected of this species are Hot sufficiently perfect to admit of a 

 satisfactory description. The characteristics can only be given by comparison with G. virginianus, 

 as already described. 



The skin upon which this species was based by Mr. Oassin is a female in very poor condition 

 (6690,) and much stretched, which may account for its having been described as larger than 

 C. virgimcmus. This is scarcely the case, as shown by the comparative measurements of the 

 two. There is no undoubted specimen of the male bird in the collection before me from Texas, 

 the only large one, with a decidedly w;hite patch on the throat, lacking the white marks on the 

 end of the tail. 



This species is conspicuously different from Pennsylvania specimens of G. virginianus in the 



very great amount of mottling on the upper parts, which exhibit nothing of the dark tones 



prevailing in the last mentioned skins. The predominent tint of the mottling is a yellowish 



rusty, brightest, and the blotches largest, on the scapulars. The under parts are yellowish 



20 b 



