BIRDS OF NORTH AND MIDDLE AMERICA. 77 



c. AMiite superciliary stripe narrower; white tip to wing-coverts smaller. 

 (Cayenne to eastern Brazil.) 



Microrhopias grisea grisea, adult male (extralimital).« 

 ee. White superciliary stripe broader; white tip to mng-coverts larger. 

 /. Flanks and sides less extensively white, the black of abdomen relatively 

 broader. (San Miguel Island, Bay of Panamd.) 



Microrhopias grisea alticincta, adult male (p. 82). 

 Jf. Flanks and sides more extensively white, the black of abdomen rela- 

 tively narrower. 

 g. Larger (wing 59.5, tail 52.5, tarsus 22). (Tobago.) 



Microrhopias grisea tobagensis, adult male (extralimital).^ 

 gg. Smaller (wing 53-54.5, tail 4G-49, tarsus 20-21). (Margarita Island, 

 Venezuela.) 



Microrhopias grisea margaritensis, adult male (extralimital).c 

 (Id. General color of upper parts paler (hair brown or broccoli brown). (Main- 

 Innd of A'enezuela and (Colombia.) 



Microrhopias grisea intermedia, adult male (extralimital).'' 

 cc. Sides of head (below eyes) and under parts bui'fy or whitish. {Adult females.) 

 d. General color of upper parts darker (deep grayish brown); under parts dis- 

 tinctly buffy. 

 e. \Miite tip to wing-coverts much smaller; under parts (except chin, ujiper 

 throat, and vuider tail-coverts) deep buff or ochraceous-buff. 



Microrhopias grisea grisea, adult female (extralimital). 

 ee. A\'hite tip to wing-coverts much larger; under jjarts paler buffy. 



Microrhopias grisea alticincta, adult female (p. 82). 

 dd. (ieneral color of upper parts paler (light grayish brown); under parts dull 

 white, tinged with buff on chest and sides. 



Microrhopias grisea intermedia, adult female (extralimital). « 



a Turdus griseus Boddaert, Tabl. PI. Enl., 1783, 39 (based on Le grisin de Cayenne 

 Daubenton, PL Enl., pi. 043, fig. 1). — [Motacilla] grisea Gmelin, Syst. Nat., i, ])t. 2, 

 1789, 904. — Thamnophilus griseus Spix, Av. Bras., ii, 1825, 29, part, pi. 41, (ig. 1 

 (Pard.). — F[ormicivora] grisea Cabanis, in Wiegm. Ai'chiv fiir Natm-g., 1847, pt. i, 

 225. — Fonnicivora grisea Sclater, Proc. Zool. Soc. Lond., 1858, 238; Cat. Birds Brit. 

 Mus., XV, 1890, 24d.— EUipura grisea BuTmeiHter, Syst. Ueb. Th. Bras., iii, 1850, 07.— 

 Drymophila grisea Richmond, Auk, xvi, Oct., 1899, 354, in text. — Formicivora nigri- 

 collis Swainson, Zool. Journ., ii, no. vi, July, 1825, 147 (catinga woods of Ilumildez, 

 Brazil; coll. W. Swainson). — M[ijiothera] superciliaris Lichtenstein, Verz. DoubL, 1823, 

 44 (Cayenne). — Formicivor[a] deluzae M^netries, Mem. Acad. Imp. Sci. St. Peters!)., 

 ser. 6, etc., i, 1835, 484, pi. 5, fig. 2 (Serra dos Orgaoes, near Rio de Janeiro, Brazil; 

 coll. Acad. St. Petersb.). 



& Formicivora tobagensis Dalmas, Mem. Soc. Zool. France, xiii, 1900, 141 (Tobago; 

 coll. Count Dalmas). — D[rymophila] grisea tobagensis Ridgway, Proc. Biol. Soc. Wash., 

 xxi, Oct. 20, 1908, 194, in text. 



<^ Drymophila grisea margaritensis Ridgway, Proc. Biol. Soc. Wash., xxi, Oct. 20, 

 1908, 194 (Margarita I., Venezuela; coll. U. S. Nat. Mus.). 



d F[ormicivora] intermedia Cabanis, in Wiegm. Archiv fiir Naturg., xiii, Bd. 1, 

 Heft 2, 1847, 225 (Cartagena, Colombia, and Aragua Valley, Venezuela; coll. Berlin 

 Mus.). — Formicivora intermedia Sclater, Cat. Birds Brit. Mus., xv, 1890, 250. — l>[ry- 

 mophila] intermedia Richmond, Auk, xvi, Oct., 1899, 354, in text. — Eriodora inter- 

 media Bangs, Proc. Biol. Soc. Wash., xii, June 3, 1898, 138 (Santa Marta, Colombia). 



« I have not seen adult females of M. g. tobagensis nor M. g. margaritensis. In 

 addition to the forms mentioned in the key, two others (apparently conspecific) aie 

 autoptically unknown to me: Formicivora orenocensis Hellmayr, Bull. Brit. Orn. 

 Club, xiv, Feb. 27, 1904, 54 (Altagracia, Orinoco R., Venezuela; coll. Tring Mus.), 

 and Formicivora cano-fumosus Cherrie, Mus. Brookl. Inst. Arts and Sci., Science 

 Bull., i, no. 10, June 30, 1909, 387 (Las Barrancas, Orinoco R., Venezuela; coll. Mus. 

 .Brooklyn Inst.). 



