258 NORTH AMERICAN BIRDS. 



Dendroica olivacea, Scat. 



OLIVE-HEADED WAKBLEK. 



Sylvia olivacea, Giii.iUD, Birds Te.xa.s, 1.S41, 14, \\\. vii, tig. 2. — ScLATER, P. Z. S. 1855, 

 66. Sijlvicola olivacea, Ca.ssin, III. Biril.s Te.\a.s, etc. 1855, 283, pi. xlviii. Ilhimam- 

 phus olit<uxus, ScLATElt, P. Z. S. 1856, 291 (Cordova). Dendroica olivacai, ScLATElt, 

 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 tmniata, DuBUs, 

 Bull. Acad. Bru.\. XIV, 1847, 104. —Ib. Rev. Z. 1848, 245. Sylvicola tainiata, BoN. 

 Consp. 1850, 309. 



Sp. Char. Head aild 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-covert,i 

 wliite, foi-ming two bauds on the wing ; a third wliite patch at the bases of the primaries 

 (cKcept tlie outer two), and e.Kteniling forwards along the outer edges. Secondaries edged 

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

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

 band, and a broad stripe Irom 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. Lengtli, 4.')0 ; wing, 2.88 ; tail, 

 2.15 ; tarsu.s, .75. 



A female specimen (l-l.^^fiO). perhaps also in aulunuial (ihimage, has the saffron replaced 

 bj- clear yellowish, except on the top of head and nape, which are olivc-grcien. The lilack 

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



Hab. Mexico (both coasts to the southward) ; Ouatemala. 



Tliis s])ecies is friveii l>y Mr. Giraud as occumiig in Texas, but it is pos- 

 sible that lie 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, r.Ainn. 



BLACK-THROATED GRAY WARBLER. 



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

 Om. Biog. V, 1839, 57, pi. cccxcv. Vennivora niy. Box. ; Nutt. Sylvicola nig. 

 AuD. Bird.s Am. II, pi. xciv. Rhimanphus nig. Cab. 1850. Dendroica nig. Baird, 

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

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

 SucKLEY, P. R. R. Rep. XII, ii, 1859, 180. —Cooper, Om. Cal. I, 1870, 90. ^Sylvia 

 halseii, Giraud, Birds Texas, 1838, pi. iii, fig. 1, ? (suggested by Sclater). 



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

 black ; rest of under parts, a strijie on the side of the head, beginning acmtely just above the 

 middle of tlie 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 bauds ; quills 

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



/f ^. 



