Vol x~| Brewster on a Neiv Marsh Wren. 215 



1893 J 



instead of greenish; very much more green on sides of breast and body, 

 the white of the under parts, especially of the throat and jugulum, being 

 confined to a narrow central space; upper mandible light reddish at the 

 base instead of black as in cyaneicollis. 



Type, $ adult (No. 24,125, collection of William Brewster, Nacosari, 

 Sonora, Mexico, March 31, 1SS7, J. C Cahoon) : Top and sides of head, 

 with sides of neck, glittering blue ; remainder of upper parts rather dull, 

 dark, but shining green, somewhat obscured by drab on the rump and 

 upper tail-coverts; shoulders and wing-coverts green like the back but all 

 the quills dark hair brown with a faint gloss of purplish ; tail dark glossy 

 green, the outer pair of feathers broadly tipped with drab; under parts 

 Toiledwhite, the middle of the throat tinged with clayey buff (a stain, 

 probably), the feathers along its sides with large, crescent-shaped, sub- 

 terminal spots of blue; sides of the breast greenish blue; sides of the body 

 brilliant green ; bill (in the dried specimen) dull reddish brown or brown- 

 ish orange, lightest at the base, deepening to horn color at the tip. Wing, 

 2.07 inches; tail, 1.27; length of culmen from base, 1.02; from feathers, 

 .88; width of bill at base, .13. 



I have compared this specimen — which as far as known is 

 unique — with six Peruvian examples (including the type) of 

 cyaneicollis it) the collection of the British Museum. Although 

 in general coloring it bears a closer resemblance to this species 

 than to any other of the genus, Mr. Salvin is of the opinion that 

 its true relationship is with C. quadricolor ( = C. ellioti Berl). 

 From the latter, however, as well as from C. violiceps, it differs 

 very decidedly in the brighter green of the neck and back, in the 

 blue instead of purplish reflections on the crown, and in the blue 

 or greenish on the sides of the neck and body. It is smaller than 

 C. cyanocephala, with a shorter tail, and white instead of gray 

 under tail-coverts. 



DESCRIPTION OF A NEW MARSH WREN, WITH 



CRITICAL NOTES ON CISTOTHORUS 



MARIANA SCOTT. 



BY WILLIAM BREWSTER. 



In 188S Mr. W. W. Worthington sent me some odd-looking 

 Marsh Wrens from Sapelo Island, Georgia. They were evidently 

 not C. palustris, and as they agreed in several respects with Mr. 



