392 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



c. Throat l)lafk; under wing-coverts gray. {Dacnis caiiana.) 

 d. (ieiifral color bright cerulean or turquoise blue, changing to V)luish green; 

 throat deeper black. (Colombia to southern Brazil and Bolivia; Chiriqui?) 



Dacnis cayana cayana, adult male (p. 392) 

 dd. General color bright ultramarine or cobalt blue, changing to greenish blue; 

 throat dull greenish V)lack. (Isthnuis of Panama to Nicaragua.) 



Dacnis cayana ultramarina, adult male (p. 394) 

 cc. Throat l)lui8h green; under wing-coverts white. (Isthmus of Panama. ) 



Dacnis vignieri, adult male (p. 396) 

 bh. Under parts of body greenish black; thighs scarlet; wings entirely black. 



(Costa Rica to Colombia. ) Dacnis vennsta, adult male (p. 396) 



aa. No black on lores nor back; under parts of body yellowish green, or light buffy 

 grayish anteriorly passing into buffy or buffy yellowish posteriorly. (Adult 

 females and young. ) 

 h. Under parts yellowish green, the throat bluish gray; pileum greenish blue; 

 Aving-coverts, remiges, and rectrices edge<l with Ijright yellowish green. 

 <: More yellowish green, with head lighter and more greenish blue. 



Dacnis cayana cayana, adult female and young male (p. 392) 

 cc. Clearer green, with head deeper and less greenish blue. 



Dacnis cayana ultramarina, adult female and young male (p. 395) 

 bb. Under parts light buffy grayish anteriorly, passing into buffy posteriorly (the 

 abdomen more yellowish); wing-coverts plain greenish gray or olive, the 

 remiges and rectrices edged with same. 



Dacnis vennsta, adult female and young male (p. 397) 



DACNIS CAYANA CAYANA (Linnaeus). 

 CAYENNE DACNIS. 



Adult male. — Lores, po.stoculav .streak (of variable extent), chin, 

 throat, and l)ack, uniform l)lack; wings and tail black; middle wing- 

 coverts tipped with bright greeni.sh blue, greater coverts and tertials 

 broadly, secondaries and primaries (in part) narrowly, edged with the 

 same; rest of plumage ])right cerulean or turquoise blue viewed toward 

 the light, changing to bluish green when viewed from the light; bill 

 browMiish l)lack, the mandible more brownish (flesh}^ in life) basally; 

 iris reddish brown;' legs and feet brownish in dried skins, fleshy* or 

 bluish' in life; length (skin.s), 99.6-138.(5 (11;"). 1); wing, 61.2-68.6 (65); 

 tail, 41.7-48 (14.2); exposed culmen, 11.9-14 (13.2); tarsus, 15.7-16.8 

 (16.3); middle toe, 10.2-11.4(10.7).' 



Adult female. — Yellowish grass green, orighter on rump and upper 

 tail-coverts, rather lighter (approaching apple green) on under parts; 

 head dull greenish l)lue oi- bluish green (nile blue or beryl green), the 

 throat paler and grayer; lesser wing-coverts darker and duller green- 

 ish blue; bill and feet as in the male, but the former rather browner; 

 length (skins), 103.1-130.3 (116.6); wing, 57.2-68.6 (63); tail, 39.6-47 



' Forbes, Ibis, 1881, 330. 



■M:)'Orbigny, Voy. Am. Merid., Ois., 1839, 221. 



^ Fourteen specimens. 



