BIRDS OF NORTH AND MIDDLE AMERICA. 77 
e. White 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 wing-coverts larger. 
jf. Flanks and sides less extensively white, the black of abdomen relatively 
broader. (San Miguél Island, Bay of Panamé.) 
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).5 
gg. Smaller (wing 53-54.5, tail 46-49, tarsus 20-21). (Margarita Island, 
Venezuela.) 
Microrhopias grisea margaritensis, adult male (extralimital).¢ 
dd. General color of upper parts paler (hair brown or broccoli brown). (Main- 
land of Venezuela and Colombia.) 
Microrhopias grisea intermedia, adult male (extralimital).¢ 
cc. Sides of head (below eyes) and under parts buffy or whitish. (Adult females.) 
d. General color of upper parts darker (deep grayish brown); under parts dis- 
tinctly buffy. 
e. White tip to wing-coverts much smaller; under parts (except chin, upper 
throat, and under tail-coverts) deep buff or ochraceous-buff. 
Microrhopias grisea grisea, adult female (extralimital). 
ee. White tip to wing-coverts much larger; under parts paler buffy. 
Microrhopias grisea alticincta, adult female (p. 82). 
dd. General 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).¢ 
« Turdus griseus Boddaert, Tabl. Pl. Enl., 1783, 39 (based on Le grisin de Cayenne 
Daubenton, Pl. Enl., pl. 648, fig. 1).—[ Motacilla] grisea Gmelin, Syst. Nat., i, pt. 2, 
1789, 964.—Thamnophilus griseus Spix, Av. Bras., ii, 1825, 29, part, pl. 41, fig.’1 
(Paré).—F[ormicivora] grisea Cabanis, in Wicgm. Archiv fiir Naturg., 1847, pt. i, 
225.—Formicivora grisea Sclater, Proc. Zool. Soc. Lond., 1858, 238; Cat. Birds Brit. 
Mus., xv, 1890, 249.—Ellipura grisea Burmeister, Syst. Ueb. Th. Bras., iii, 1856, 67.— 
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 Humildez, 
Brazil; coll. W. Swainson).—M[yiothera] superciliaris Lichtenstein, Verz. Doubl., 1823, 
44 (Cayenne).—Formicivor[a] deluzae Ménétriés, Mém. Acad. Imp. Sci. St. Petersb., 
ser. 6, etc., i, 1835, 484, pl. 5, fig. 2 (Serra dos Org4oes, near Rio de Janeiro, Brazil; 
coll. Acad. St. Petersb.). 
> Formicivora tobagensis Dalmas, Mém. 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.). 
@ Flormicivora] intermedia Cabanis, in Wiegm. Archiv fir 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.—D[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). 
¢] 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) are 
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. 16, June 30, 1909, 387 (Las Barrancas, Orinoco R., Venezuela; coll. Mus. 
Brooklyn Inst.). 
