Vol. 32, pp. 217-224 December 31, 1919 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



THE RELATIONSHIPS AND GEOGRAPHICAL DISTRI- 

 BUTION OF THE SPECIES AND RACES BELONGING 

 TO THE GENUS RHYNCHOCYCLUS. 



BY CHARLES B. CORY. 



The following brief synopsis of the species and subspecies of 

 the genus Rhynchocyclus is the result of an examination of ma- 

 terial in the Field Museum of Natural History, supplemented 

 by specimens borrowed from other museums in this country, 

 and represents the writer's present views on the valid forms of 

 this group. 



Genus Rhynchocyclus Cabanis & Heine. 



Rhynchocyclus Cabanis & Heine, Mus. Hein., ii, 1859, p. 56 (Type Mus- 

 cipeta flaviventris Wiedj. 



Rhynchocyclus sulphurescens sulphurescens (Spix). 



Platyrhynchus sulphurescens Spix, Aves. Bras., ii, 1825, p. 10, pi. 12, fig. 



I male. 1 

 Rhynchocyclus sulphurescens pallescens Hartert & Goodson, Novit. Zool., 



XXIV, 1917, p. 414 (Santa Cruz, Bolivia). 2 



Range: Southern Brazil (Minas Geraes; Rio de Janeiro; Parana; S. Paulo; 



southern and southwestern Matto Grosso; Santa Catharina); Paraguay 



(Sapucay; Puerto San Juan); Bolivia (Mapiri; Yacniba; Rio Tapacani; 



Monte de Basilio, Dep. Santa Cruz) ; Argentina (Prov. Jujuy and Misiones) . 



Rhynchocyclus sulphurescens assimilis (Pelzeln). 



Rhynchocyclus assimilis Pelzeln, Orn. Bras., 1869, pp. 110, 181 (Borba, 

 Rio Madeira type locality). 3 



iBut not fig. 2 female, which is supposed to represent Craspedoprion olivaceus olivaceus 

 Temm. (c/. Hellmayr, Abhandl. Ak. Wiss. Miinchen, XXII, 1906, p. 643). 



21 can not distinguish specimens from Santa Cruz, Bolivia (pallescens Hartert & Good- 

 son) from those from Sao Paulo and Santa Catharina, Brazil, although one Bolivian example 

 is somewhat paler. 



3According to Hellmayr (cf. Chapman, Bull. Amer. Mus. Nat. Hist., XXXVI, 1917, 

 p. 435). 



45— Pboc. Biol. Soc. Wash., Vol. 32, 1919. (217) 



