Vol. XIX, pp. 1 15-120 September 6, 1906 



PROCEEDINGS 



OF THK 



BIOLOGICAL SOCIETY OF WASHINGTON 



_ ^ 



DESCRIPTIONS OF SOME NEW FORMS OF OLIGOMY- 



ODIAN BIRDS. 



BY ROBERT RIDGWAY. 



By permission of the Acting Secretary of the Smithsonian Institution. 



Coryphotriccus gen. nov. {Tyrannidx) . 



Type, Pilangus albovilallus Lawrence. 



Similar to Pilangus but bill relatively much shorter and broader (ex- 

 posed culmen little if any longer than tarsus and much le.ss than twice the 

 width of bill at frontal antiyo), and rictal bristles nuu-li weaker; still more 

 closely related to Cmmpitts, but exposed culmen equal to or slightly longer 

 than tarsus, instead of much shorter. 



{Kopv<pri, the crown ; tpLkkos, a small bird.) 



Todirostrum cinereum coloreum subsp. nov. 



Type, No. 33,350, Am. Mus. Nat. Hist., adult male, Corumba, Matto- 

 grosso, southwestern Brazil, March 17, 1886; H. H. Smith. 



Similar to T. clneretua cinereum (Linnseus) but larger, back more exten- 

 sively and clearly olive-green (the hindneck sometimes olive-green), v^^hite 

 tips to rectrices more extensive, yellow of under parts brighter, and yellow 

 margins to greater wing-coverts and inner secondaries paler. 



Southwestern Brazil (Province of Mattogrosso.) 



Atalotriccus pilaris venezuelensis subsp. nov. 



Type, No. 73,454, adult male, Am. Mus. Nat. Hist.; San Antonio, Ber- 

 nuidez, Venezuela, July 15, 1896; W. H. Phelps. 



Similar to .1. ]>ilaris ])ilaris but larger and coloration darker, with pileum 

 decidedly darker and duller in color than back. 



Venezuela. 



Rhynchocyclus klagesi sp. nov. 



Type, No. 75,587, Am. Mus. Nat. Hist., adult female, Maripa, Venezuela, 

 May 9, 1901 ; S. M. Klages. 



Similar to E. sulphurescens (Spix) but much smaller and coloration 

 slightly darker ; wing, 52 ; tail, 44 ; exposed culmen, 1 1 ; tarsus, 15 ; middle 

 toe, 8. 



Venezuela (Maripa). 



26— Proc. Biol. Soc. Wash., Vol.. XIX, 1906. (115) 



