222 Proceedings of the Biological Society of Washington. 
“Allied to R. sulphurescens, but differs in being olive grey above instead 
of green; the head somewhat darker and inclining to lead-colour; tail- 
feathers pale brown, edged with whitish; quills also pale brown, margined 
with olive-grey. The two bars on the wings, formed by the margins of 
the median and greater coverts, are white instead of yellow; the throat and 
chest olive-grey, not yellow; the middle of the abdomen whitish, in place 
of yellow; the under tail-coverts buff towards the ends; the under wing- 
coverts white instead of yellow. Bill black above, greyish white below; 
tarsi and feet bluish slate coloured; iris brown. Total length 5.2 inches; 
culmen 0.6; wing 2.55; tarsus 0.8.’ (Chubb J. c. orig. descr.) In the same 
paper Chubb records R. sulphurescens sulphurescens from the same lo- 
cality. 
Rhynchocyclus flaviventris flaviventris (Wied). 
Muscipeta flaviventris Wied. Beitr. Naturg. Bras. (3), ii, 1831, p. 929 
(Rivers Mucuri and Alcobaca, southern Bahia, Brazil). 
Rhynchocyclus flaviventris aurulentus Todd, Proc. Biol. Soc. Wash., XXVI, 
1913, p. 171 (Momotoco, Santa Marta, Colombia). 
Range: Northern and eastern Colombia (Santa Marta; Lower Magdalena 
region; Cucuta; “Bogota” region); Venezuela (Puerto Cabello; Tocuyo; 
Cumana; Rio Aurare; Caicara and along the middle Orinoco River, etc.); 
Trinidad; Tobago; British Guiana; northern and eastern Brazil (Amazonian 
region from about the Rio Branco, eastward to Rio Tocantins; Rio Ja- 
munda; Para; Jua and Quixada, Ceara, and southward to Rio Araguaya, 
Goyaz and Rio Mucuri, Bahia). 
In this group R. f. viridiceps and R. f. borbe appear, to be well marked 
races, but I am unable to separate the Santa Marta bird (aurulentus Todd) 
from the typical form. There is apparently considerable individual vari- 
tion (either seasonal or due to difference in age) in the coloration of the 
under parts and borders of wing coverts, and to a somewhat lesser degree 
the same may be said of the coloration of the upper parts. The brightest 
examples are from Ceara, although I can not distinguish them from some 
specimens from Santa Marta, and from both of these localities a few se- 
lected specimens are unquestionably brighter than any examples I have 
seen from Bahia. Most of the Bahia specimens are old skins and the single 
fresh skin is as brightly colored as most of the Santa Marta specimens. 
From the material before me the differences are slight and apparently not 
constant. ‘Two specimens from the Rio Branco show a slight tendency 
towards R. f. borbe, but are much nearer RA. f. flaviventris. 
I have examined 61 specimens of this form from the following localities: 
Colombia (Santa Marta region, Momotoco, Bonda, etc., 18; Lower Magda- 
lena River and Cucuta 5); Venezuela (Rio Aurare 2; Cumana 1; Suapure, 
Maripa and La Union 9); Trinidad 6; Tobago 3; Brazil (Bahia 7; Rio Branco 
region 5; Quixada and Jua, Ceara 5). 
Rhynchocyclus flaviventris viridiceps (Sclater & Salvin). 
Rhynchocyclus viridiceps Sclater & Salvin, P. Z. S. Lond., 1873, p. 280 
(Pebas, N. E. Peru). 
