( 91 ) 



This specimen, which agrees perfectly with von Pelzeln's description, is of 

 particular interest, proving as it does that C. brevirostris is a very distinct species. 

 As far as I know, the types collected by Natterer were the only examples in . 

 existence. 



Onr Teffe' specimen, apparently an adult bird, differs from a large series of 

 C. rariegatus (Gm.) from British Guiana, Caura and Para by its considerably 

 shorter wings and much smaller, shorter bill. Besides this, there are very striking 

 differences in coloration. The top of the head, which is uniform slate-black in 

 C. variegatus, is chestnut rufous, each feather with two black cross-bands ; lores 

 and all the sides of the head are bright ferruginous (instead of blackish slate- 

 colour) ; the sides of the breast and abdomen, instead of being broadly barred with 

 black, show but a few narrow cross-lines, the lower flanks alone being regularly 

 banded. The chest is distinctly paler ferruginous than in C. rariegatus ; the back 

 including uropygium and upper tail-coverts is pale olive-brown with broad black 

 bands (instead of black with numerous, narrow ochreons cross-lines as in the allied 

 species) ; the ochreons bars on the upper wing-coverts are three to four times 

 broader, being about 3 to 5 mm., while in C. rariegatus they are not more than 

 1 mm. wide. 



In other respects, particularly in the pale brown legs and in the deep rufons 

 colour of the hindneck, sides of the neck and jngnlum, C. brevirostris agrees with 

 C. variegatus. Even young birds of the latter species are much larger than the 

 ? from Teffe, from which they differ — in addition to the characters given above 

 — by the presence of white spots on the foreneck and upper wing-coverts. 

 For the sake of comparison I append the measurements of several skins of 

 C. variegatus. 



Six adults from British Guiana and Caura Valley : wing 100 — 162 ; bill 

 29—33 mm. 



Two young birds from British Guiana and Para : wing 159, 158 ; bill 30, 

 32 mm. 



