Cory—The Genus Rhynchocylus. 223 
Range: Northeastern Peru (Pebas);? central Peru! (La Merced; Chan- 
chamayo); eastern Ecuador (Rio Napo); southern Colombia (Florencia)? 
This well marked race differs from R. f. flaviventris in having the upper 
parts decidedly darker (more olive green and less yellowish green); lores 
yellowish olive (without rusty tinge); lesser and median wing coverts green- 
ish like the back; throat and breast yellowish green, like the sides, becom- 
ing clearer yellow on middle of belly. Wing 56; tail 48 mm.? 
This form is close to R. f. borbe and resembles it in coloration of lores and 
wing coverts, but it differs in its slightly more greenish upper parts and 
decidedly more greenish throat and chest (not clear olive yellow as in 
borbe). 
Rhynchocyclus flaviventris borbe Hellmayr. 
Bhynchocyclus flaviventer borbe Hellmayr, Verh. zool.-bot. Gesell. Wien, 
liii, 1903, p. 208 (Borba, Rio Madeira, Brazil). 
Range: Northwestern Brazil (Lower Rio Madeira; Borba; Marmellos¢ 
and Monte Verde, Rio Purus).§ 
This form is similar to R. f. viridiceps from northeastern Peru, but differs 
in its clear olive yellowish throat and chest (not light yellowish green as in 
viridiceps). 
1According to Hellmayr (Novit. Zool., XVII, 1910, p. 296) two specimens from La 
Merced, central Peru (preserved in the Branicki Museum) are larger, and may prove to be 
a different form. Wing 60); tail 494 and wing 6334; tail 53 mm. 
2Chapman Bull. Amer. Mus. Nat. Hist., XXXVI, 1917, p. 436. 
3Measurements from specimen from Florencia in the American Museum of Natural 
History. The measurements of the type, as given by Sclater & Salvin (I. c.) are wing 2.2 
in.; tail 1.7in. J have not seen a specimen from Ecuador or Peru. 
4Hellmayr, Novit. Zool., XVII, 1910, p. 295. 
5Snethlage, Bol. Mus. Goeldi, VIII, 1914, p. 369. 
