3G. SALPI>'CTES, 267 



eyebrow isabelline white, slightly tinged with rufous ; ear-coverts 

 aud sides of face dull white, the hinder part of the former dusky 

 brown ; throat and breast duU white, with mesial black spots and 

 streaks ; the sides of the upper breast ashy brown : sides of body 

 Hanks, and under tail-coverts cinnamon-buff, as also the axDlaries • 

 the under tail-covcrts broadly barred with black ; under win^- 

 eoverts buffy white, with dusky spots and bars ; quills dusky brown 

 ashy whitish along the inner web; '^bill dusky, the ed-es pale 

 yeUow; feet dusky; iiis hazel" (Audubon). Total length 5-2 inches 

 cidmeu U-8, wing 2-7, tail 1-95, tarsus 0-9. (Mas. Salvhi and 



(jrodliHin.) 



The sexes are stated by Dr. Coues to be alike in coloration. 

 _ Obs. The Eock-^^ ren is a migratory bird, ranging to Guatemala 

 ^f f.f *^^- ^specimen collected by Mr. Salviu at the Cuesta of 

 LachiliD ^ era Paz, in Xovember, is identical with another from the 

 lellowstone Eivcr, obtained by Dr. Hayden in September 



On the other hand, two specimens from Mexico are remarkable 

 tor their much bghter coloration, and for the smallness of the white 

 n^^^ "llf"^ ''PP'''' '^'"■^''-® ""^^ the narrowness of the streaks below 

 Ihese differences do not appear to me to be the result of abrasion of 

 plumage to which the species is liable from its habits, but rather to 

 indicate a pale resident form in Mexico. This can only be de- 

 termined by a larger series than is at present available' These 

 Mexican birds may also be the young birds of the year in their 

 nrst-moultcd winter dress. 



T.-I"""lf "' ^""^^ plumage (49th parallel, July 21, 1S74 ; Dawson) 

 Ditters Irom the adult in the more uniform pliimage, absence of spots 

 on the upper surface and of streaks on the under ; wings and 

 tail much asm the adult ; head and neck uniform ashy brown with 

 the laintcst trace of cross bars ; back pale cinnamon, as well as the 

 rump and under tail-coverts, the upper back more distinctly barred 

 with dusky blackish brown; wing-coverts pale cinnamon, barred 

 like the back the greater coverts more broadly; scarcely an indi- 

 tion of an eyebrow, which is represented merely \>r a few light reddish 

 feathers ; eyelid also pale reddish ; ear-coverts a^hy whitish, washed 

 with pale reddish on the hinder margin ; under" surface of body 

 dull whitish, the sides of the body and under tail-coverts isabelline"- 

 the under wing-coverts and axiUaries of the same colour • nuills 

 dusky, with isabeUme margins to the inner webs. Total len"-th 5-4 

 inches, cidmen 0-7, wing 2-9, tail 2-35, tarsus 0-95 ° 



Obs. Young birds killed in August in Guatemala, by Mr Salvin 

 appear to have lost the freshness which characterized "the specimen 

 just described. Ihe plumage ismuchabraded and thebars on the unner 

 surface are very distinct, while they still retain the uniform head 

 Vu i ^ specimens are in full moult into the adult plumage. 

 The Rock-^\ ren is found along the Eocky Mountains, through the 

 highlands of Mexico to Guatemala. ' o ' i"o 



b. Jxn . .k. \\ est side of liocky J. K. Lord, Esq. fP 1 



Mountams. ^ l -j- 



