BIRDS OF NORTH AND MIDDLE AMERICA. 81 
instead of rufous- or tawny-chestnut, the upper parts also slightly 
darker. 
Adult male—Length (skin), 109; wing, 49.5; tail, 46; culmen, 
12.5; tarsus, 16.% 
Adult female—Length (skin), 116-121 (118); wing, 48.5-51.5 
(50); tail, 45.5-52 (48.7); tarsus, 16.5; middle toe, 10.° 
Northwestern Colombia (Rio Truando) to western Ecuador 
(Babahoyo; Esmeraldas; Balzar Mts.; Sarayacu; Chimbo) and 
Cayenne. 
Formicivora consobrina Scuater, Proc. Zool. Soc. Lond., 1860, 279, 294 (Babahoyo, 
w. Ecuadé6r; coll. P. L. Sclater); Cat. Am. Birds, 1862, 183 (Babahoyo); Cat. 
Birds Brit. Mus., xv, 1890, 255 (Babahoyo, Esmeraldas, Balz4r Mts., and 
Sarayacu, Ecuadér; Pocune and Medellin, Antioqufa, and Bogoté, Colom- 
bia; Cayenne).—SciaTerR and Savin, Proc. Zool. Soc. Lond., 1879, 525 
(Pocune, Antioquia, Colombia).—BrruerscH and TaczanowskI, Proc. 
Zool. Soc. Lond., 1883, 565 (Chimbo, w. Ecuadé6r). 
[Formicivora] consobrina SctateR and Satvin, Nom. Av. Neotr., 1873, 72.— 
Suarez, Hand-list, iii, 1901, 26. 
D[rymophila] consobrina Ricumonp, Auk, xvi, Oct., 1899, 354, in text. 
Formicivora quixensis (not Thamnophilus quixensis Cornalia) Cassi, Proc. Acad. 
Nat. Sci. Phila., 1860, 190 (Rio Truando, n. w. Colombia). 
Formicivora boucardi (not of Sclater) Sarvin and Gopman, Biol. Centr.-Am., 
Aves, ii, 1892, 216, part (Rio Truando). 
MICRORHOPIAS GRISEA ALTICINCTA (Bangs). 
SAN MIGUEL ANTWREN. 
Similar to M. g. wntermedia* of Colombia and Venezuela, but adult 
male much darker above (deep grayish sepia, purplish slate color, or 
deep brownish slate instead of hair brown or broccoli brown) and 
more extensively black beneath, the adult female darker brown 
above and much more strongly buffy beneath. 
@ One specimen, from Rio Truando, Colombia. 
+ Two specimens. 
Locality. Wing, |) Tail), | Tet | Middle 
FEMALES. 
One adult female from Rio Truando, Colombia....................-..-- 48.5 45.5 16.5 10 
One adult female from Ecuad6r..-............202 2.0 2e cece eee ee eee eee 51.5 | [52?] 16.5 10 
Besides having a longer wing and, apparently, much longer tail than the Rio 
Truando specimen, that from Ecuadér has the white tips to the rectrices much more 
extensive. The specimens examined, however, are all imperfect, and a much 
better series would be necessary to show whether the Colombian and Ecuadorian 
birds are really different or not. 
¢See p. 77. 
81255°—Bull. 50—11—_6 
