COSTA RICAN TITYRA 



dd. Throat without colored patch 



Querula purpurata, female 



cc. Smaller (sometimes very small), plumage not 

 uniform black. 



d. Plumage rufous or tawny. 



e. Small, length not over 141 mm. (5.55 in.); 

 rufous above, under parts tawny buff. .... 

 Pachyrhamphus cinnamomcus, sexes similar 



ee. Medium and large; under parts tawny. 



f. Medium, length about 196 mm. (7.75 in.) . 

 Lipaugus h. holerythus, sexes alike 



ff . Larger, length about 242 mm. (9.50 in.) . . 

 Lathria unirufa, sexes alike 



dd. Plumage not extensively rufous or tawny. 

 e. Small, olive above, pale yellow below 



Pachyrhamphus polychropterus cinereiven- 



tris, female 



ee. Plumage largely gray (or brownish gray in 

 female) and black. 



f. Larger, length about 178 mm. (7.00 in.); 

 head, wings and tail partly black. 



g. Base of bill and bare skin about eyes 



bright red Tityra 



semifasciata costaricensis, sexes similar 



gg. No red on head or bill :. 



Erator albitorques fraseri, sexes similar, 

 (female with patch of chestnut on side 

 of head.) 



ff. Smaller, length not over 150 mm. (5.80 in..) ; 

 top of head and back black, rump and 

 under parts slate gray Pachyrham- 

 phus polychropterus cinereiventris, male 



i. Tityra semifasciata costaricensis Ridgway 

 Costa Rican Tityra 



Length 195 mm. (7.70 in.); tail 69 mm. 

 (2.70 in.). 



338 



