258 NORTH AMERICAN BIRDS. 



Dendroica olivacea, Sclat. 



OLIVE-HEADED WARBLEE. 



Sylvia olivacea, Giraud, Birds Texas, 1841, 14, pi. vii, fig. 2. — Sclater, P. Z. S. 1855, 

 66. Sylvicola olivacea, Cassin, III. Birds Texas, etc. 1855, 283, pi. xlviii. Rhimam- 

 phus olivaceus, Sclater, P. Z. S. 1856, 291 (Cordova). Dendroica olivacea, Sclater, 

 P. Z. S. 1858, 298 (Oaxaca ; cold region). —Ib. P. Z. S. 1859, 363 (Jalapa). — Ib. 

 Catal. 1861, 31, no. 190. — Baird, Rev. Am. B. 1864, 205. Sylvia tceniata, DuBUS, 

 Bull. Acad. Brux. XIV, 1847, 104. —Ib. Rev. Z. 1848, 245. Sylvicola tmniata, Bon. 

 Consp. 1850, 309. 



Sp. Char. Head and neck all round, with jugulum, brownish-saffron, with a greenish 

 tinge on the nape. Rest of upper parts ashy. Middle and tips of greater wing-coverts 

 white, foiming two bands on the wing ; a third white patch at the bases of the primaries 

 (except the outer two), and extending forwards along the outer edges. Secondaries edged 

 externally with olive-green. Inner webs of quills conspicuously edged with white. Under 

 parts, except as described, white, tinged with brownish on the sides ; a narrow frontal 

 band, and a broad stripe from this through eye and over ear-coverts, black. Outer tail- 

 feather white, except at base and towards tip ; greater portion of inner web of next 

 feather also white, much more restricted on the third. Length, 4.60 ; wing, 2.88 ; tail, 

 2.15 ; tarsus, .75. 



A female specimen (14,3G9), perhaps also in autumnal plumage, has the saffron replaced 

 by clear yellowish, except on the top of head and nape, which are olive-green. The black 

 frontal and lateral bands are replaced by whitish, leaving only a dusky patch on the ears. 



Hab. Mexico (both coasts to the soutliAvard) ; Guatemala. 



This species is given by Mr. Giraucl as occurring in Texas, but it is pos- 

 sible that he may have been misled as to the true locality. It may, how- 

 ever, be yet detected along the southern border of the United States. 



Nothing is known of its habits. 



Dendroica nigrescens, Baird. 



BLACK-THROATED GRAY WARBLER. 



Sijlvia nigrescens, Townsend, J. A. N. Sc. VII, ii, 1837, 191 (Columbia River). —Aun. 

 Orn. Biog. V, 1839, 57, pi. cccxcv. Vfirmivora nig. Bon. ; Nutt. Sylvicola nig. 

 AuD. Birds Am. II, pi. xciv. EhimanpMis nig. Cab. 1850. Dendroica nig. Baird, 

 Birds N. Am. 1858, 270 ; Rev. 186. — Sclater, P. Z. S. 1858, 298 ; 1859, 374 (Oax- 

 aca ; high mountains in March). — Heermann, P. R. R. Rep. X, iv, 40. — Cooper & 

 Suckley, p. R. R. Rep. XII, ii, 1859, 180. —Cooper, Orn. Cal. I, 1870, 90. i Sylvia 

 lutlscii, GiRAUD, Birds Texas, 1838, pi. iii, fig. 1, 9 (suggested by Sclater). 



Sp. Char. Head all round, forepart of the breast, and streaks on the side of the body, 

 black ; rest of under parts, a stripe on the side of tlie head, beginning acutely just above the 

 middle of the eye, and another parallel to it, beginning at the base of the under jaw (the 

 stripes of opposite sides confluent on the chin), and running further back, white. A yellow 

 spot in front of the eye. Rest of upper parts bluish-gray. The interscapular region and upper 

 tail-coverts streaked with black. Wing-coverts black, with two narrow white bands ; quills 

 and tail-feathers brown, the two outer of the latter white, with the shafts and a terminal 



