BIRDS OF PENNSYLVANIA. 
281 
lice, flies, spiders, ants and larvae. It is stated, however, that tliis 
species often feeds on small seeds and berries. 
Dendroica caerulescens (Gmel.). 
Black-throated Blue Warbler. 
Description {Plate 97, male and female'). 
Length about 5^ ; extent 8. 
Male adult. — Uniform blue above ; no white wing-bars but basal portion of 
primaries (other than first) white, forming a conspicuous patch ; lores, a narrow 
frontal line and plumage on sides of head, sides of breast, chin, throat and sides, 
deep black ; rest of under parts white ; outer tail feathers spotted on inner webs 
with white (these spots in female, and the young, in fall are much restricted). Bill 
blackish ; legs (dried skins) brownish, but in autumnal specimens are often much 
paler. 
Female. — Grayish olive-green above ; tail and wings, especially the former, with a 
bluish cast ; lores and ear-patches dusky ; a pale whiiish line from nostrils above and 
back of eye ; eyelids whitish; wliite patch on primaries as in male but smaller; 
white spots on tail feathers indistinct ; chin, throat, breast and rest of under parts 
dull (soiled) yellow. 
Habitat. — Eastern North America to the plains, breeding from northern New 
England and northern New York northward, and in the Alleghanies to northern 
Georgia ; West Indies in winter. 
The Black-throated Blue Warbler occurs generally throughout Penn- 
sylvania only as a passing visitor in the spring and fall. Dr. Yan Fleet 
has found this warbler breeding in Clarion and Clearfield counties, and 
Prof. A. Kock has observed it as a regular summer resident of Lycoming 
county. I liave repeatedly seen these birds in the mountainous regions 
in different sections of the central and northern parts of the state, and 
there can be no doubt but that they breed regularly in nearly all our 
higher mountainous regions. The female of this species, although con- 
siderably different from the male in his showy coat of blue, black and 
white, can always be known by the white patch at base of primaries. 
Dendroica coronata (Linn.). 
Myrtle Warbler. 
Description {Plate 98, male). 
Rump, crown and sides of breast yellow, in all plumages more or less distinct. 
Length (average of six specimens) male 6 inches ; extent (three specimens in flesh) 
9| ; wing 3 or a little less. Female somewhat smaller ; bill and legs black. 
Mate, in spring. — Above slate-blue, streaked with black ; two wing-bands white 
and inner webs of outer tail feathers spotted with same ; lores and sides of head, and 
most of breast and sides (except as above mentioned) black; chin, throat, eyelids 
and superciliary line, and. belly white. 
Female. — Similar but much duller. Autumnal specimens are chiefly brownish 
above, with blackish streaks ; below much lighter and quite thickly streaked. 
Habitat. — Eastern North America, chiefly, straggling more or less commonly 
westward to the Pacific ; breeds from northern United States northward, and winters 
