2g2 NORTH AMERICAN BIRDS. 



cealed by white edges ; the sides streaked with black. Length, 5 inches ; wing, 2.58 ; 

 tail, 2.30. 



Hab. Eastern Province of United States ; Greenland ; Heligoland, Europe ; south to 

 Panama R. R. In Mexico, Xalapa, Cordova, and Oaxaca ? Cuba alone in West Indies. 

 Mexico (everywhere in winter, Sumichrast). 



The autumnal male has the black of throat and breast obscured by whitish 

 tips. Females are yellowish-white beneath, tinged with grayish towards the 

 tail. 



As shown in the generic chapter, D. virens is the type of a section of 

 olivaceous Warblers with black chin and throat. The following more elabo- 

 rate diagnoses of the group may facilitate its study, the species being quite 

 closely related : — 



Common Characters. Upper parts more or less olivaceous-green, with the 

 feathers streaked centrally with black (sometimes concealed). Sides of head yel- 

 low. Chin and throat black ; rest of the under parts, including inside of wings, 

 white, with or without yellow on breast. Wings with two white bands. Inner 

 web of lateral tail-feather almost entirely white from the base. 



Above bright olive-green with concealed black streaks ; tail-coverts ashy. 

 Sides conspicuously streaked with black ; crissum unspotted. Jugulum some- 

 times faintly tinged with yellowish. An obscure dusky-olive stripe through 

 the eye, and a crescentic patch of the same some distance beneath it . . virens. 



Above olivaceous-ashy (rump pure ash), with more distinct black spots. 

 Top and sides of head clear yellow, the feathers of the crown tipped with 

 black, or clouded with dusky plumbeous. No dark markings or stripes on 

 side of head. No distinct black streaks beneath ; black of throat restricted 



to front of neck occidenfaUs. 



Prevailing color of upper parts black, with oUvaceous edgings on the back ; 

 rump and upper tail-covert pure black. Sides and crissum streaked with 

 black. A simple black stripe through the eye ; no patch beneath it . chrysojjareia. 



Above olive-green. Upper tail-coverts ashy, with central black streaks. 

 Feathers of head above black, with olive-green edges. A broad olivaceous 

 black stripe through eye from lores, involving the ears, in which is a yellow- 

 ish crescentic patch below the eye. Black feathers of throat and chin edged 

 with yellow. Jugulum and sides of breast also yellow. Sides streaked 

 with black. No distinct black streaks on crissum .... townsench'L 



Habits. — The Black-throated Green Warbler, like nearly all the mem- 

 bers of this highly interesting genus, has, to a very great degree, escaped the 

 closer observations of our older ornithologists. Wilson only noticed it as it 

 passed through Pennsylvania in its early spring migrations. He mentions its 

 frequenting the higher branches of forest trees in search of the larvse of tlie 

 smaller insects that feed upon the opening buds, and describes it as a lively, 

 active bird, having only a few chirping notes. All had passed on by the 

 12th of May. Their return he was never able to notice, and he became 

 afterwards satisfied that a few remained all the summer in the higher grounds 

 of that State, having obtained several in June, 1809. 



Audubon met with this bird from Newfoundland to Texas, but never found 



