SYNONYMY AND CHAKACTEKS OP D. NIGRESCENS 263 



flew from tree to tree in their ceaseless migratory course. At 

 this time and place, they were not among pines, but in forests 

 of spruce and fir, and their flights seemed to be regulated some- 

 what by the presence or absence of these kinds of conifers. 

 Their motions were extremely rapid ; a moment spent in thread- 

 ing the mazes of the interlaced branches, — a few hurried sweeps 

 about the ends of the limbs, and they were off to the next tree 

 to repeat such actions till lost sight of in the density of the 

 forest. Their only note at this season was the chipping sound 

 which many Warblers utter. The writer concludes with the re- 

 mark, that though he obtained no evidence that the birds breed 

 in Arizona, he saw no reason why the mountain fastnesses 

 of that Territory should not offer a congenial summer home. 



Bflack-tliroated Gray "Warbler 



Dendroeca nlgrescens 



SylTla nlgrescens, Towns. Jonrn. Phlla. Acad. vii. 1837, 191 (Columbia Eiyer) ; viii. 183D, 



153.— roams. Narr. 1839, Sil.—Aml. OB. v. 1839, 57, pi. 395. 

 VermiTora nigrescens, Bp. CGL. 1838, il.—2futt Man. L 2d ed. 1840, 471. 

 SylTlCOla nigrescens, Aud. Syn. 1S39, m.—Aud. BA. IL 1841, 62, pi. 9t.—Bp. CA. i. 1850, 308. 

 MnlotiUa nigrescens, Gray, G.otB. i. 1848, 196. 

 Bliimanphiis nigrescens. Cab. MH. i. 1850, 20. 

 Dendroica nigrescens, £d. BN'A. 1858, 270.— &;. PZS. 1858, 295, 298 (Oaxaca).— Scl PZS. 1859, 



374 (Oaxaoa).— ffmrj/, Pr. Pliila. Acad. xi. 1859, 106 (New Mexico).- Beiaro. PEEB. x. 



1859, 40.— a <« S. NHWT. 1860, 180.— Bd. Ives'sEep. Colo.pt. tL 1861, i.—Bd. liev. 



AB. 1865, 186.— Sumich. Mem. Boat. Soo. i. 1869, 547 (Oiizaba,).— Aiken, Pr. Boat Soo. 



XV. 1872, 197 (Colorafio).- £. B. a B. NAB. i. 1874, 258, pi. 12, f. 8. 

 Dendrceca nigrescens, Sd. Gat. 1862, 30 (Oaxaca).— aoM««, Ibis, 1865, 163 (Arizona).- Ooucs, 



Pr. Phila. Acad, xviii. 1866, 69 (Arizona).— Sm?mJ. Opfv. K. Tet.-Akad. Foih. iii. 1869, 



610.— OoiMS, Ke.y, 1872, 98.— Coop. Am. Nat. Tiii. 1874, 10.- Ooue*, BNW. 1874, 55, 232.— 



nets. Pr. Boat. Soo. xvii. 1875, 357 (Cuba). 

 ? Sylvia palpebralis, Ornith. Oomm. Jonm. Phila. Acad. viL 1B37, 193 (descr. nnlia). 

 1 Sf iTicola tristis, Nutt. Man. i. 2d ed. 1840, 472 (acarceiy identifiable). 

 Sylvia lialseli, Gir. 16 Sp. Tex. B. 1841, fol. 11, pi. 3, f. 1 ( 9 ). 

 Sylvicola nigricans, Henry, Pr. Phila. Acad. vii. 1855, 309 (New Mexico). 

 Black-throated Gray [or Grey] Warbler, Authors. 



Hab. — Rocky MouutaiDS to the Pacific, United States; and south into 

 Mexico in winter. Not yet recorded north of the United States. Breeds in 

 suitable places throughout its United States range. Winters extralimital. 



Cn. SP. — ^ Supra cceruleocinerea, dor so medio nigra striato ; 

 capite toto et jugulo nigris, maculd ante oculum Jlavd, strigis post- 

 oculari et maxillari albis; infrh alba, lateribus nigro striatis. 



3 , adult : Above bluish-ash, the interscapular region, and usually also the 

 upper tail-coverts, streaked with black. Below, from the breast, pure white, 

 the sides streaked with black. Entire head, with chin and throat, black ; 

 a sharply-defined yeUow spot before the eye, a broad white stripe behind the 

 eye, and a long white maxillary stripe widening behind from the corner of 



