Vol. XXI, pp. 191-196 October 20,1908 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



DIAGNOSES OF SOME NEW FORMS OF NEOTROPICA] 



BIRDS. 



BY ROBERT RIDGWAY. 

 [By permission of the Secretary of the Smithsonian Institution.] 



fa 



1. Thryorchilus basultoi sp. nov. 



Type from Las Vueltas, Cordillera de Dota, Costa Rica; No. 209,935, 

 U. S. National Museum; adult female; May 21, 1908; Francisco Basulto. 



Differing from T. browni browni and T. browni ridgwayi in having the 

 pileum and hindneck and auricular area dark sepia or nearly clove brown, 

 strongly contrasted with the mummy brown of back, instead of concolor 

 with the latter; superciliary stripe much broader, pure white; white of 

 under parts much purer, and white markings on wings more conspicuous; 

 wing and tail decidedly longer, but bill much shorter and relatively 

 stouter. Length (skin), 95mm. ; wing, 52; tail, 32.5; exposed culmen, 

 LI. 5; tarsus, 22.5; middle toe, 15. 



Named in compliment to Don Francisco Basnlto, of Cienfnegos, Cuba, 

 to whom I am indebted for valuable assistance during my recent collect- 

 ing trip to Costa Rica. 



2. Coryphotriccus albovittatus distinctus snbsp. nov. 



Type from Rio Reventazon (near Guayabo Station), eastern Costa Rica; 

 No. 209,464, U. S. National Museum; adult male; March IS, 1908; Fran- 

 cisco Basnlto. 



Similar to C. albovittatus (Lawrence), from line of Panama Railway, 

 but decidedly larger; back, etc., much grayer olive; yellow of under parts 

 paler (light canary yellow instead of nearly lemon yellow) ; and blackish 

 area on side of head much broader. Length (skin), 155mm.; wing, 87; 

 tail, 68; exposed culmen, 15.5; tarsus, 19; middle toe, 14. 



( THA MNOPHIL US DOLIA TUS. ) 



The geographic variations of this species, which inhabits the whole of 

 Central America and tropical parts of Mexico (except the Pacific slope of 

 the latter), together with Cayenne, Surinam, British Guiana, Venezuela, 

 Trinidad, and Tobago, have not been thoroughly worked out. It is very 



30— Proc. Biol. Soc. Wash., Vol. XXI, 1908. (191) 



