XVIII. BRIEF DESCRIPTIONS OF SOME NEW SPECIES 



OF BIRDS FROM COSTA RICA AND A RECORD 



OF SOME SPECIES NOT HITHERTO RE- 



PORTED FROM THAT COUNTRY. 



By M. A. Carriker, Jr. 



Genus FORMICARIUS Boddsert. 

 Formicarius castaneiceps sp. no v. 



Type, No. 28203, Carnegie Museum, adult J\ from Juan Vinas, 

 Costa Rica. Collected May 7, 1907, by M. A. Carriker, Jr. 



Similar to Formicarius rufipectus Salvin, but upper parts very dark 

 olive ; top of head and nape dark chestnut, sharply contrasted with the 

 back ; and with a distinct superciliary stripe of black. 



Above rich dark olive ; rump tinged with chestnut ; upper tail cov- 

 erts deep chestnut ; wings and tail dusky black, the former with a band 

 of fulvous at the base of the inner webs of the remiges ; under wing 

 coverts black, basally bright fulvous ; lores, superciliary stripe, sides 

 of head, chin and throat black ; crown, hind neck, sides of neck, breast, 

 and under tail coverts, rich chestnut, the crown darkest, the chestnut 

 of the breast paling into rich fulvous posteriorly, which color extends 

 medially to the vent ; sides of the abdomen and flanks clove brown ; 

 " iris hazel; feet dark brown; bill black." Measurements of type: 

 length (in flesh), 208 mm.; wing, 90 mm.; tail, 57 mm.; exposed 

 culmen, 23 mm.; tarsus, 42 mm. 



Genus SPOROPHILA Cabanis. 



Sporophila crissalis sp. no v. 



Type, No. 28966, Carnegie Museum, adult d\ from Buenos Aires 

 de Terraba, Costa Rica, collected August 23, 1907, by M. A. Carri- 

 ker, Jr. 



Above dull grayish olive, the secondaries and tertials edged with 

 the same color ; primary coverts black ; primaries dull black, edged 

 with ashy, the inner ones buffy white at the base of the outer webs, 

 forming a speculum ; tail dull black, indistinctly edged with olive ; 



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