BANGS AND PENARD: SURINAM BIRDS. 39 



landisch-Guiana, 1881, p. 164) lists R. hamatus and R. leucopygus, 

 but it is not certain that the specimens were correctly named since 

 R. sociabilis does not appear in the same list. Cabanis (Schomburgk's 

 Reisen in Br. Guiana, 1848, 3, p. 736) records it from British Guiana 

 without description, but omits R. sociabilis altogether, hence it is not 

 clear whether he referred to R. hamatus or R. sociabilis, Chubb (Birds 

 of British Guiana, 1912, 1) does not include it in his list, and throws 

 Schomburgk's R. hamatus into synonymy under R. sociabilis. F. P. 

 and A. P. Penard do not include it in their work on the birds of Guiana. 



Apparently this species has no brown young plumage. Two 

 specimens, obviously immature, have the general gray coloration of 

 the adult. The tail, however, is crossed by conspicuous, white bars, 

 two in 247^ and four in 479.^ The upper and under tail-coverts are 

 narrowly tipped with whitish; the primaries, except tips, are barred; 

 the wing-coverts, secondaries, and some of the feathers on the lower 

 parts, are narrowly tipped with dirty white. \ 



A third specimen, 447,^ nearly fully adult, has the remains of the 

 bars on the tail and a slight whitish freckling at the base of the first 

 primary. The fully adult bird is almost uniform slate-gray, except 

 the tail, the ends of the primaries, and the tips of the secondaries, 

 which are black. 



36. Chondrohierax uncinatus (Temminck). 



Four specimens, both sexes, adult -and immature. Vicinity of 

 Paramaribo, March and May. 



One bird, 456 S is evidently very old, the usual white barring of the 

 lower under-parts being practically obsolete. 



37. Harpagus bidentatus (Latham). 



Three specimens, Vicinity of Paramaribo, and Javaweg, February, 

 April, and July. 



38. Ictinia plumbea (Gmelin). 



Three adults. Vicinity of Paramaribo, Wanaweg, and Overtoom, 

 March, and April. 



1 Penard Coll. 



