414 NOVITATES ZOOLOGICAE XXIV. 1017. 



abdomen almost whitish, the latter certainly more yellow ; probably this form 

 differs again from superciliaris, as Ridgway (I.e.) also calls attention to the pale 

 underside of a Bolivian specimen. 



8. The jorms of Rhynchocyclus sulphurescens. 



1. Rhynchocyclus snlphuresceihs sulphurescens (Spis). 



Plalyrhynchus sulphurescens Spix, Av. Brasil. ii. p. 10. pi. xii. fig. 1 (1825 — "in sylvis Provineiae 

 Rio de Janeiro, Piauhy et flum. Amazonum." Terra typica: Rio de Janeiro). 



Wc have 3 (J, 2 § from Sao Paulo, collected by Hempcl, and 1 i from 

 Minas Geraes, collected by A. Robert. 



The crown almost uniform ^^ith the back, but slightly darker and some- 

 times tinged with grej'. Back bright olivaceous green. Wings: 68-70, 1 ? 665 

 mm. 



2. Rhynchocyclus sulphurescens assimilis (Pelz.). 

 Rht/nchocyclus assimilis Pelzcln, Orn. Brasil. p. 110 (1869 — Rio Negro, North Brazil). 



We have a series from Calama on the Rio Madeira, from TcfTe, Rio Solimoes, 

 and from Chamicuros, East Peru, and Xeberos, collected by Bartlett. 



These birds differ chiefly by the more slaty-grey crown and darker upper 

 surface. Wings from 62-71 mm. 



3. Rhynchocyclus sulphurescens pallescens subsp. nov. 



Upperside as in Rh. s. sulphurescens, but the green slightly brighter, under- 

 side considerably paler, more sulphur-yellow. Wings : 68" 5, 65, 63 mm. 



The Tring Bluscum has one specimen (evidently a male, but not sexed) 

 from Santa Cruz, Bolivia, 21.viii. 1889, No. 197, Gustav Garlepp coll. 

 (type of R. s. jxillescensl), and two skins, both sexed males, but smaller, col- 

 lected by J. Steinbach at elevations of 450 and 750 metres in the province of 

 Sara, Bolivia, in December 1905. 



4. Rhynchocyclus sulphurescens cherriei subsp. nov. 



Closely alUed to adult R. s. assimilis. but the crown of the head not so 

 slaty, more olivaceous, tinged with green ; vinder-surface paler, more sul- 

 phureous ; the yellow edges to the upper wing-coverts generally not so 

 conspicuous and some^^■hat narrower. Wings 62-68'5, the latter measurement 

 exceptional, generally only to 66 and 67 mm. The specimens with wings of 

 62 and 63 mm. probably all females, though partially sexed " males." Rh. s. 

 assimilis is larger, the wings of the males ranging up to 70 and 71 mm. 



Habitat : Cayenne, Surinam, British Guiana, Caura River, and Blaipures 

 on the Orinoco. 



Type: S ad. Cayenne, 2. xii. 1902. No. 1,001, Geo. K. Chcrrie and B. T. 

 Gault coll. "Iris pale greyish. Bill above black, below pale, nearly flesh- 

 colour." (Tring Museum.) 



Named after J. K. Chcrrie, who collected most of our specimens. 15 

 specimens compared. 



The specimen No. 11,407 from Maipures, Orinoco, has been erroneously 

 enumerated as Rh. poliocephalus in Nov. ZooL. 1902, p. 47. Both species occur 

 in the same places. 



