Carriker : List of the Birds of Costa Rica. 631 



Families DENDROCOLAPTID^E and FURNARIID^E. 



Key to the Costa Rican Species. 



a. Not spotted, streaked, or vermiculated above or below (except rarely a few 

 paler shaft-lines on throat); or if throat vermiculated, tail short and 

 black, variously colored, and with rectiices either stiff or soft. 

 b. Rectrices stiff and harsh, with more or less acuminate tips and shafts 

 projecting beyond vane of feather. 

 c. Tail comparatively short and sooty-black, rounded at end. 



d. Lower rump and upper tail-coverts rich ferruginous-chestnut; 



chest slightly paler than rump; abdomen rich clove-brown. 



e. Throat and sides of head ashy-gray, pileum decidedly darker 



than back. Sclerurus canigularis. 



ee. Throat ruddy-ochraceous; pileum scarcely darker than back. 



Sclerurus mexicanus. 

 dd. Rump and tail-coverts concolorous with back (rich seal-biown); 

 throat white, feathers edged with blackish; chest slightly fer- 

 ruginous, center of feathers paler. Sclerurus guatemalensis. 

 cc. Tail longer, not rounded, and some shade qf chestnut-brown, never 

 blackish. 

 d. Wings and tail same color (except tips of primaries dusky), some 

 shade of chestnut or cinnamon-brown. 

 e. Smaller (wing 72 mm.); wings, tail, and rump bright cinna- 

 mon-rufous; head and lower parts olive-gray. 



Sittasomus sylvioides. 

 ee. Larger (wing 100 to no mm.). 



f. Pileum and lower parts ruddy-brown; wings and tail 

 chestnut; tail 75 to 80 mm. 



Dendrocincla homochroa acedesla 



ff. Pileum, back, and lower parts olive-brown (darker above) 



wings and tail very dark chestnut-brown; tail 100 mm. 



Dendrocincla ridgwayi ridgwayi. 



dd. Wings (median portion of secondaries and tertials) light buffy- 



cinnamon; tail deep chestnut; back olive-brown; below dark 



ochraceous-brown. Dendrocincla anabatina saturata. 



bb. Rectrices soft, shaft not thickened or protruding. 



c. Wing-coverts bright cinnamon or chestnut-rufous. 



d. Tail blight chestnut or cinnamon-brown; back olive-brown. 

 e. Tail chestnut; lower parts grayish-olive; smaller (wing 

 65 mm.; tail, 75 mm.). 

 f. Crown and sides of head chestnut. 



Acrorchilus erythrops rufigenis, adult. 

 ff. Crown concolorous with black. 



Acrorchilus erythrops rufigenis, juv. 



ee. Tail cinnamon-brown; lower paits ruddy-ochraceous; larger 



(wing and tail 97 mm.). Philydor panerythrus. 



dd. Tail dark grayish-brown (cr slightly cinnamon on outer webs 



above); crown and nape chestnut. 





