VOL. XIX, PP. 1 15-120 SEPTEMBER 6, 1906 



PROCEEDINGS 



OF THE 



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. (Tyrannidm). 



Type, Pitangus albovitaltus Lawrence. 



Similar to Pitangus but bill relatively much shorter and broader (ex 

 posed culmen little if any longer than tarsus and much less than twice the 

 width of bill at frontal antise), and rictal bristles much weaker; still more 

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

 than tarsus, instead of much shorter. 



7, the crown ; TPLKKOS, a small bird.) 



Todirostrum cinereum coloreum subsp. nov. 



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

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



Similar to T. cinereum cinereum (Linnaeus) but larger, back more exten 

 sively and clearly olive-green (the hindneck sometimes olive-green), white 

 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. 



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

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



Similar to A . pilaris pilaris 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 R. sulphurescens (Spix) but much smaller and coloration 

 slightly darker ; wing, 52 ; tail, 44 ; exposed culmen, 11 ; tarsus, 15 ; middle 

 toe, 8. 



Venezuela (Maripa). 



26 PROC. BIOL. Soc. WASH., VOL. XIX, 1906. (115) 





HI 



