Myrtle-Warbler 451 
to the nest, so as to cover up and prevent the incubation 
of the intruding egg. 
Black-throated Blue Warbler. Dendroica cerulescens. 
A.O.U. Checklist no 654—Colorado Records—Cooke 94, p. 183 
(error); 97, p. 114; 04, p. 57; H. G. Smith 96, p. 76; 08, p. 190; 
Chapman 07, p. 133. 
Description.—Male—Above slaty-blue, the middle of the back some- 
times a little speckled with black ; wings black, extensively edged with 
blue, a conspicuous white patch towards the base of the primaries, 
except the outermost; the primaries also extensively white on the 
inner web ; tail dusky, edged with blue, the outermost feathers with 
a large subterminal patch on the inner web; below, throat, sides of 
the head and flanks black ; rest of the under-parts white ; iris brown, 
bill black, legs dusky horn. Length 4-50 ; wing 2-60 ; tail 1-90 ; culmen 
-40; tarsus -65. 
The autumn and winter male is very similar, but has a brown bill 
and w buffy tinge on the white of the flanks. The young male has 
a slight greenish wash over the blue of the upper-parts and a slight 
white freckling on the black of the throat and flanks. The female 
is olive-green above, rather more bluish on the crown and tail; an in- 
complete whitish ring round the eye and a white patch at the base of the 
primaries ; below pale yellow. Size about the same as the male. 
Distribution.—Eastern North America, breeding from Hudson Bay 
and Newfoundland south to the mountains of Pennsylvania; on 
migration south, chiefly east of the Mississippi to southern Florida 
and the Antilles. , 
The Black-throated Blue Warbler is « rare straggler as far west as 
Colorado. It has only been twice met with, on both occasions by 
H. G. Smith. He obtained a female on the Platte River near 
Denver, May 24th, 1888, and very plainly observed, but did not obtain, 
w male at Wray on September 18th, 1903. 
Myrtle-Warbler. Dendroica coronata. 
A.O.U. Checklist no 655—Colorado Records—Aiken 72, p. 196; 
Ridgway 73, p. 176; Trippe 74, p. 232 ; Henshaw 75, p. 193; Allen & 
Brewster 83, p. 158; Cooke 97, pp. 19, 114; 04, p. 61; Henderson 03, 
p- 108; 09, p. 239 ; Chapman 07, p. 141; H. G. Smith 08, p. 190. 
Description.—Male—Above slaty-blue, streaked with black; patch 
on the crown, rump, and a patch on either side of the breast, bright 
yellow, the rump-patch palest; wings and tail dusky, with greyish 
edgings, the coverts broadly tipped and edged with white, forming 
a double wing-bar ; the three outer pair of tail-feathers with a large 
subterminal white spot on the inner web ; sides of the head black, with 
FF 2 
