262 NORTH AMERICAN BIRDS. 



cealed by white edges ; the sides streaked with black. Length, 5 inelies ; win<r, 2.58 ; 

 taU, 2.30. 



Hab. Eastern Province of United States; Greenland; Helisroland, Europe; sonth to 

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

 Mexico (everywhere in winter, Sit.vicbrast). 



Tlie autumnal male lia.s the black of tliroat ami 1 ireast obscured by whitish 

 tips. Females are yellowish-white beueath, tiuged with grayish towards the 

 tail. 



As shown in the generic chapter, D. vircns 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 CnARACTERS. TTppcr parts more or less olivaceons-jjreen, 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 j'cUow 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 ; crissuni unspotted. Jngulum some- 

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

 the eye, and a crescentic patcli of the same some distance beneath it . . virem:. 



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; lilack of tliroat restricted 



to front of neck occidenfalh. 



Prevailing color of upper parts black, with olivaceous 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 . chrysoparda. 



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

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

 black stripe thi'ough eye from lores, involving the ears, in which is a yellow- 

 ish crescentic patcli below the e3'e. 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 .... foiimseiirlit. 



Habits. — Tlie P.lack-tliroated Green Warliler, like nearly all the mem- 

 bers of tliis higlily interesting genus, has, to a very great degree, escaped tlie 

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

 passed through Penn.sylvania in its early spring migrations. He mentions its 

 frequenting the higher brandies of forest trees in search of the larvic of the 

 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 tlie 

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

 afterwards satisfied that a few remained aU the summer in the liigher grounds 

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



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



