124 BULLETIN ijO, UNITED STATES NATIONAL MUSEUM. 



PLANESTICUS NIGRESCENS (Cabanis). 

 SOOTY THRUSH 



Adult male. — General color uniform deep grayish sepia brown or 

 sooty, becoming black, or nearly so, on lores, orbital region, wings, and 

 tail, the last two slightly glossy; bill, eyelids, legs, and feet yellowish 

 (deep orange-yellow in life) ; iris very pale olive-gray or grayish white; 

 length (skins), 237-259 (250); wing, 136-147.5 (142.4) ; tail, 112-123 

 (117); exposed culmen, 20-22.5 (21.3); tarsus, 33.5-38.5 (36.7); 

 middle toe, 22.5-26 (24.3). « 



Adult female. — Similar in coloration to the adult male and not 

 always distinguishable, but usually slightly paler or browmer; orange- 

 yellow of bill, etc., less intense, and legs and feet duller yellow (dull 

 lemon yellow in life); length (skins), 238-257 (248.4); wing, 132.5- 

 140 (136.8); tail, 107.5-119.5 (113); exposed culmen, 20-23 (21.4); 

 tarsus, 35-37.5 (35.9); middle toe, 23-25 (23.8).'' 



Younc) .—Aho\e much as in adults, but more or less conspicuously 

 streaked from occiput to rump with light ochraceous or buffy, the 

 wing-coverts with terminal triangular spots of the same; under parts 

 light ochraceous or browmish buff, everywhere (except on throat) 

 heavily spotted with dusky. 



High mountain summits of Costa Rica (Volcan de Poas; Volcan de 

 Irazii; Volcan de Turrialba; Dota; Rancho Redondo) and Panama 

 (Volcan de Chiriqui). 



Turdus nigrescens Cabanis, Journ. fiir Orn., viii, Sept., 1860 (pub. Jan., 1861 ), 324 

 (Volcan de Irazu, Costa Rica; coll. Berlin Mus.). — Sclater, Cat. Am. Birds, 

 1862, 358 (Costa Rica).— Lawrence, Ann. Lye. N. Y., ix, 1868, 91 (Irazii 

 and Dota, Costa Rica). — Frantzius, Journ. fiir Orn., 1869, 290 (Volcan de 

 Irazu, Costa Rica, alt. 9,000 to 10,000 ft.).— Salvin, Proc. Zool. See. Lond., 

 1870, 180 (Volcan de Chiriqui, Veragua). — Boucard, Proc. Zool. Soc. Lond., 

 1878, 50 (Volcan de Irazu, Costa Rica, 6,000 to 10,000 ft. ; descr. nest and eggs; 

 habits).- — Salvin and Godman, Biol. Centr.-Am., Aves, i, 1879, 25, pi. 4. 



« Twenty specimens. 

 b Eleven specimens. 



Costa Rican specimens compare in average measurements with a series from Chiriqui, 

 as follows: 



There is apparently no difference in elevation. 



