BIRDS OF NORTH AND MIDDLE AMERICA. 7 
SCYTALOPUS ARGENTIFRONS Ridgway. 
SILVERY-FRONTED SCYTALOPUS. 
Adult male.—Forehead and superciliary region silvery gray (no. 6 
or no. 7 gray ®); rest of upper parts plain sooty black, the feathers 
of rump tipped, more or less distinctly, with dark rusty brown or 
chestnut; sides of head, anterior portion of forehead, chin, throat, 
and chest plain deep slate color or blackish slate, the color usually 
darker around eye (especially between eye and the silvery gray of 
superciliary region); slate color of chest gradually changing to paler, 
or slate-gray, on breast, this into light silvery gray (sometimes 
tinged with fulvous) on abdomen; sides rather darker slate color 
than ‘hest; flanks, anal region, and under tail-coverts sooty black, 
the feathers conspicuously tipped or terminally margined with deep 
rusty brown or russet; maxilla brownish black, mandible more 
brownish; legs and feet deep horn brownish (in dried skins) ; length 
(skins), 102-114 (107.5); wing, 51.5-54 (52.9); tail, 34.5-40 (35.8); 
culmen, 11-12 (11.6); tarsus, 20-21 (20.8); middle toe, 16.5-17.5 
(17.1).° 
Adult female-—Similar to the adult male but gray U-shaped 
frontal and superciliary mark obsolete or entirely wanting; 
feathers of all the upper parts broadly but indistinctly margined 
with dark brown; gray of under parts confined to chin, throat, and 
chest, the whole sides, flanks and under tail-coverts very broadly 
margined with russet, changing to buffy cinnamon on abdomen; 
bil, etc, as in adult male, but mandible lighter brownish; 
length (skins), 109-112 (110.5); wing, 50-52 (50.8); tail, 40-41.5 
(40.7); culmen, 10.5-11.5 (11); tarsus, 19.5-21 (20.3); middle toe, 
16.5-17.5 (17).° 
High mountains of Costa Rica (Volcén de Irazti; Volcan de Pods; 
Coliblanco) and western Panama (Boquete; Volcan de Chiriquf). 
Scytalopus argentifrons Ripaway, Proc. U. S. Nat. Mus., xiv, no. 869, Oct. 31, 
1891, 475 (Volcan de Irazti, Costa Rica; coll. U. S. Nat. Mus.); xvi, 1893, 613 
(additional specimens described).—Satvin and Gopmav, {Biol. Centr.-Am., 
Aves, ii, 1892, 246.—Banas, Proc. New Engl. Zool. Club, iii, 1902, 48 (Boquete 
and Volcén de Chiriquf, Panam4, 5,000-7,000 ft.) —CarrikER, Ann. Car- 
negie Mus., vi, 1910, 594 (Ujurras de Térraba, Volc4n de Irazi, La Estrella 
de Cartago, and Volc4n de Turrialba, Costa Rica; crit.; habits) —Frrry, 
Pub. 146, Field Mus. N. H., orn. ser., i, no. 6, 1910, 271 (Coliblanco, Costa 
Rica). 
eer argentifrons SHaRPE, Hand-list, iii, 1901, 5. 
@ Ridgway’s Nomenclature of Colors (ed. 1886,) plate 2. 
6 Five specimens from Costa Rica. An adult male from Boquete, Panama, meas- 
ures: Wing, 51.5; tail, 40; tarsus, 20.5; middle toe, 17. 
¢ Three specimens, from the Volcan de Irazt, Costa Rica. 
