Vol. 32, pp. 217-224 December 31, 1919 
PROCEEDINGS 
OF THE 
BIOLOGICAL SOCIETY OF WASHINGTON 
THE RELATIONSHIPS AND GEOGRAPHICAL DISTRI- 
BUTION OF THESPECIES 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 Wied). 
Rhynchocyclus sulphurescens sulphurescens (Spix). 
Platyrhynchus sulphurescens Spix, Aves. Bras., ii, 1825, p. 10, pl. 12, fig. 
I male.! 
Rhynchocyclus sulphurescens pallescens Hartert & Goodson, Novit. Zool., 
XXIV, 1917, p. 414 (Santa Cruz, Bolivia).? 
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) .* 
1But not fig. 2 female, which is supposed to represent Craspedoprion oli 8 
Temm. (cf. Hellmayr, Abhandl. Ak. Wiss. Miinchen, XXII, 1906, p. 643). 
21 can not distinguish specimens from Santa Cruz, Bolivia (pallescens Hartert & Good- 
gon) 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—Proc, Brox. Soc. Wase., Vou. 32, 1919. (217) 
14: isi 
4 
Fe . ae DW. ra ne 
