BANGS AND PENARD: SURINAM BIRDS. 47 



tion should stand. We have not seen specimens from the Lower 

 Amazon, but assume that they are the same as those from Guiana. 

 The Surinam bird is considerably smaller than birds from Colombia 

 and Bolivia. Its cheeks are much more naked in appearance because 

 the little cheek-feathers are much thinner, the barbs being more 

 restricted to the base of the shaft. In the Guiana bird the wing- 

 measurement varies from 226 to 233; in Colombian and Bolivian 

 birds from 242 to 250. The larger form which ranges from Bolivia 

 through Colombia to Panama should be known as 



73a. Ara severa castaneifrons Lafresnaye. 

 Type-locality. Bolivia. 



74. DiopsiTTACA hahni (Souance). 

 Two specimens, one adult 9 and one young cf , Altonaweg, May. 



75. Eupsittula pertinax chrysophrys (Swainson). 



Eight specimens, both sexes, Vicinity of Paramaribo, Rijsdijkweg, 

 and Overtoom, April, May, and September. 



Ridgway (Birds of North and Middle America, 1916, 7, p. 163) 

 considers E. aeruginosa (Linne) a subspecies of E. pertinax (Linne). 

 Chapman (Bull. Amer. mus. nat. hist., 1917, 36, p. 257), however, 

 considers E. aeruginosa a distinct species, in which case our bird 

 would be called Eupsiitula aeruginosa chrysophrys (Swainson). 



76. Pyrrhura picta picta (P. L. S. Miiller). 



Ten specimens, both sexes. Vicinity of Paramaribo, January, 

 March, and July. 



77. PsiTTACULA passerina passerina (Linne). 



Four adults, both sexes, Vicinity of Paramaribo, May, June, and 

 December. 



