BULLETIN IftUBEUM 01 COMPARATIVE I <«.\. 



Brabourne and Chubb (Birds of South America, 1912, 1, p 316 

 list both P. atricapillus (Merrem) and P. marginalia (Lichten t< 

 I'm the former they give the distribution Ecuador, Ea I Peru, and 

 Guiana; and for the latter Bast Brazil. Prom t! ematic po i- 



tion of these names in their list, we judge that these authors considered 

 atricapillus a form of the marginatus and not <•! the polyohopterm 

 group, l>iit, so far as we know, they have not given any res 

 rejecting the names in the sense used by Berlepsch. 



\\ e have examined a fairly large series of P. marginatum from \ arious 



parts of its range, and find much individual variation. Dark speci- 

 mens with or without mottled hacks may he found from the same 

 localities as paler specimens with uniform gray backs. Skins From 

 Bahia, Para, Venezuela, and the Peruvian Amazons, can he readily 

 matched, in color, in a large series from French Guiana. 



We believe that a northern form of Pachyrhampkus marginatum is 

 separable only by its smaller size, hut the difference is sufficient to 

 warrant recognition. The two forms are: — 



1. Pachyrhamphis marginatus marginatus (Liehtenstein). 



Todus marginatus Liehtenstein, Vera, doubl., 1823, p. ~>\ (Bahia). Type. — 



Berlin Museum, adult 9 . 

 Pachyrynchus attrifrons Swainson, Aniin. in menag., 1838, p. 289 ("Brazil" — 



we designate Bahia). Type. — Originally in Swainson collection, cT. 

 Pachyrhynchus swainsonii Jardine and Selby, Qlust. orn., 1829, 2, add. [4J, 



no, (3 ("Brasilia" — we designate Bahia). Type. — Originally "in Museo 



Doni. Swainson, et Gulielmi Jardine, Baronetti," — 9. 

 Pachyrhampkus atricapillus (not of Merrem) of authors. 



Subspecific characters. — Adult cT similar to Pachyrham phus polychopterus 

 tristis (Kaup), and of about the same size, but hind neck gray; forehead with 

 a narrow but distinct whitish band; interscapular region partly black; under 

 parts pale gray. Adult 9 head reddish brown, contrasting with back. 



Measurements. — Male (eight specimens) — wing, 70.0-70.0 

 (73.2); tail, 51.0-56.0 (53.6); tarsus 17.0-18.5 (17.8); exposed cul- 

 men 12.0-13.0 (12.4). 



Female (one specimen) — wing, 70.5; tail, 52.0; tarsus, 19.5; 

 exposed culmen, 12.0. 



Range. — Eastern and southeastern Brazil. 



Specimens examined. — Brazil: Bahia (including trade skins), 



