430 PROCEEDINGS OF THE NATIONAL MUSEUM. 



Description. — Tipper parts dull pront'.s brown, rather brighter on 

 the rump, where the feathers have nearly hidden roundish white mark- 

 ings; superior tail coverts hair brown, transversely marked with 

 blackish. Exposed surface of wings like the back; outer webs of sec- 

 ondaries and greater coverts paler, barred with fuscous; ])rimaiies 

 indented basally with butty. Middle tail feathers and proximal portion 

 of external webs of all the rest, save the outer pair, hair brown, regu- 

 larly baned with black; remainder of tail black, excepting the termi- 

 nal portion of the feathers — which, on the three outer pairs of feathers, 

 is grayish white, on the others hair brown — and the exterior webs of 

 the outermost pair, which are broadly barred with white. Superciliary 

 stripe white; lores and checks grayish white, somewliat mingled with 

 brownish; a dull Vandyke brown postocular stripe; sides of neck and 

 breast dull brownish gray; lower surface brownish white; the sides 

 and Hanks washed with gray; crissum regularly and strongly barred 

 with black; lining of wing grayish white. 



Young in firnt plumage. — Male; JSo. 142990, U.S.N.M., Biological 

 Survey collection; Ktzatlan, Jalisco, Mexico, June 23, 1892; E. W. 

 Nelson. Above dark grayish brown; the rumi> with concealed white 

 spots; upi)er tail-coverts faintly barred with blackish. Wing-coverts 

 and edgings to wing-cpiills like the back, those on the primaries of a 

 much lighter shade; bars on secondaries very faintly indicated. Mid- 

 dle ])air of rectrices hair brown, regularly barred with black; proxinuil 

 portion of external webs of all but outermost pair with same pattern 

 of coloration ; two outer pairs tipped with gray, and on distal portion 

 indented exteriorly with dull white; remainder of tail-feathers tipped 

 with hair brown; rest of tail black. Superciliary stripe white; lores 

 and cheeks brownish white, mixed with dark brownish; lower surface 

 brownish white, speckled anteriorly with dusky; Hanks and sides 

 washed with brownish gray; under tail-coverts washed with ochraceous 

 and barred with black. 



Mr. Ridgway has already called attention to the difference existing 

 between the birds from western Mexico (Jalisco) and those from Cali- 

 fornia,' but did not bestow a name upon the former, not being fully 

 satisfied with regard to their distinctness. Additional material, how- 

 ever, contained chiefly in the collection of the Biological Survey of 

 the Department of Agriculture, proves the Jalisco bird to be not only 

 different from the California races, but separable as well from bairdi 

 of Oaxaca and murinus of the Valley of Mexico. As there appears 

 to be no name which can be applied to this form, it is here described 

 as new. 



The characters which separate percnus from cryptus are longer wing 

 and culmen, much darker, duller color above, more conspicuous super- 

 ciliary stripe, and more heavily barred crissum. From eremophilns it 

 may be readily discriminated by its much darker, more reddish upper 



Manual of N. A. Binla, 1887, p. 551, footnote. 



