370 



ZOOLOGY— BIRDS. 



In the whole extent of region traversed by the survey in Eustern 

 Arizona, this Whippoonvill was found common. It was especially numerous 

 near Camp Apache and in the White Mountains, and I have heard them, in the 

 latter part of August, for half a dozen miles, singing soon after dusk within a 

 short distance of each other. It begins to fly but a short time before dark, 

 and on this account is rarely met with and difficult to procure. Should a 

 beaten road chance to pass through the forest, it will be found to be a 

 favorite hunting ground. I have often noticed that they make their first 

 appearance in such a spot just before dusk, and remain in the neighborhood 

 during the early evening. Probably the well known abundance of flics 

 and insects which frequent such places affords an explanation of this habit. 

 The males continue their notes till very late in the season ; for I frequently 

 heard them during the first part of October, and even as late as the 17th. 

 Young birds differ from the adult in having a lighter, purer shade of ash 

 above and a suffusion of cinnamon over the back and wings. Below is a 

 general fulvous tint, especially noticeable on the throat patch. 



Fam. CYPSELIDAE: Swifts. 



PANYPTILA SAXATILIS (Woodh.). 



White-throated Swift. 



Acanthylis saxutilix, Wdodh., .Sitgroaves Exp. Ziiili & Col. Riv., 1854, (»^. 

 Panyptihi saxatilis, Couiis, Key N. A. Birds, ]S7l', 182.— Henshaw, Aij. Lye. Nat. Ili.st. 

 N. Y., xi, 1874, 8.— /rf., An. List Birds Utah, 1871,', "Wheeler's E.\ped., 



