124 On neio South Americm Birds* 



POLlOLiEMA^ gen. nov. 



This form is readily distinguished in having the throat 

 nniform with the rest of the under surface. The bill, which 

 is long compared with the other genera of this group, has the 

 exposed culmen about equal in length to the hind toe and 

 claw. The wing is rounded, the third, fourth, and fifth quills 

 longest, the second about equal to the seventh. The tail 

 is short and nearly square, the outer feather on each side is 

 only very slightly shorter than the rest. The feet are small 

 and weak. The male and female are entirely different in 

 colour. I propose, therefore, that this form be separated 

 generically under the name of Poliolcema. 



Type, Myrmothenda cinereiventris, Sclater & Salvin. 



DiCHKOPOGON, gen, nov. 



The species which I propose to separate generically have 

 hitherto been associated with Hypocnemis of Cabanis, but 

 it differs altogether in colour as well as in its proportionate 

 measurements. The bill is small and narrow. The wing, 

 which is slightly pointed, has the third, fourth, fifth, and 

 sixth primaries longest, the second about equal to the eighth. 

 The tail, which is nearly square at the tip, is about two-thirds 

 the length of the wing. The legs and feet are proportion- 

 ately strong, the tarsus exceeds the length of the exposed 

 culmen by about two-fifths, Male and female quite different 

 in colour of plumage. 



This genus is based on Hypocnemis pcecilonota, Cabanis, 



Rhopias fu'Iviventris salnwni, subsp. n. 



Adult male. Differs from the adult male of R. f. fulvi- 

 vmtris (Lawr.) in being uniform olive on the top of the head, 

 back, and sides of face, instead of greyish brown ; upper 

 wing-coverts pale brown, not blackish ; tail paler; the white 

 on the throat more extensive; breast buff instead of slate- 

 grey ; abdomen and under tail-coverts paler and inclining to 

 buff; under surface of quills pale brown, not blackish brown. 



Total length 110 mm.; exposed culmen 12; wing 50; 

 tail 37; tarsus 17. 



Adult female. Differs from the adult female of E.f.fulvi- 

 rentris in being paler both on the upper and under surface. 

 Wing 50 mm. 



Hob. Colombia and Ecuador. 



The type, which is in the British Museum, was collected 

 by T. K. Salmon at Reined ios, Northern Colombia. 



