PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 373 



Tiind back, rump, and upper tnil-coverts suffused with olive.; somewhat 

 rusty on the middle of the back ; the head, neck, and upper back gray, 

 forehead as liglit as the chin. Flanks pure gray without olive tinge. 

 In other respects the colors agree with the typical form, excepting that 

 the gray on the under parts is lighter and purer, and the rusty on the 

 Avings paler and more mixed with olive. 



Dimensions. — Length of the first primary, IS'""'; of the second, GG°"". 

 Wing, 105 ; tail to basal end of feathers, 101 ; tarsus, 21 ; middle toe 

 with claw, 19 ; exposed culmen, 11 ; and commissure, 18""". 



AY in g formula. — Distance from the tip of the longest primary to the 

 tip of the 1st, G3; 2d, IG; 3d, 4; 4th, 0; 5th, 1; Gth, 4; and 7th, IS-""". 



Hah. — Southwestern coast of Mexico and Guatemala. 



BemarlxS. — The chief differences between the typical ohscuriis and the 

 above-described race consist in the rather duller shade of the gray, and 

 the brighter color of the rusty in the former, and in the absence of the 

 rusty or olive wash on the fore part of the back and the flanks in the 

 latter. In many respects it comes very near to Myadestes elisabeth., but 

 is easily distinguishable from this species by having the wings more 

 rusty, and the upper head and fore part of the back pure gray. 



Myadestes obscurus var. insularis Stejneger. 



Mijiaclesles obscurus Lafr. apnd Baird, Rev. Amer. Birds, i, p. 430 Qjaj-/). — Lawr. 

 Proc. Bost. Soc. Nat. Hist. 1871, p. 277, and Extr. p. 19. 



Descr.— (CT. S. Nat. Mus. No. 37327.— ^ ad. Tres Marias Islands, 

 Jan., 18G5. (Jol. A. J. Grayson.) In color this race shows very great 

 resemblance to the foregoing, the olive-colored part of the back being 

 only a trifle more rusty. It differs, however, in having the light fore- 

 head decidedly tinged with olivaceous buff", as also the light malar 

 stripe ; besides, the flauks are slightly tinged with olive. The most 

 striking differences, howev^er, are the light buff edges on the tip of the 

 innermost secondaries, and the small, but very distinct and pure white 

 spot on the tip of all the tail feathers. Grayson (Lawr. 1. c.) gives 

 the color of the eyes and the feet as black ; but the latter are in the 

 three specimens before me clear umber brown. 



List of specimens examined, and their dimensions. 



