57 
On Birds from British Guiana. 
The second addition to the Colombian avifauna is a specimen 
f of Oncostoma olivaceum, Lawr. The genus Oncostoma has 
hitherto been believed to be confined to Central America; 
the discovery of O. olivaceum at Bucaramanga therefore is a 
fact of considerable interest. The skin sent from Bucara¬ 
manga differs a little from a typical specimen of O. oliva¬ 
ceum kindly lent to me for comparison by Mr. Sclater. The 
former is of much larger dimensions and has a somewhat 
narrower bill; the upper parts of the body are of a darker 
olivaceous, especially on the top of the head, where the 
dark basal markings of the feathers are more apparent. 
Further, the upper breast is more conspicuously striated with 
dusky, and the yellowish wing-bands (formed by the terminal 
spots of the larger and middle wing-coverts) are much clearer 
and broader.; the legs, too, are darker. 
Knowing that similar differences in size and colour are to 
be found in specimens of the allied O. cinereigulare , I do not 
think the specimen from Bucaramanga ought to be separated 
specifically or subspecifically from true O. olivaceum. A 
larger series is necessary to settle this point definitely. 
O. olivaceum from Panama (mus. P. L. Sclater) : al. 41 \ 
millim., caud. 30, rostr. 11J, tars. 14 J. 
O. olivaceum from Bucaramanga: al. 49 millim., caud. 38 
rostr. 12|, tars. 14. 
The third addition to the avifauna of Bucaramanga is a 
young male in transition plumage of Euphonia nigricollis 
(Vieill.), about which no remark is needed. 
Muenden, November 1885. 
4-- XI .—A List of the Birds obtained by Mr. Henry Whitely in 
British Guiana. By Osbert Salvin, M.A., F.R.S., &c. 
[Continued from 1 The Ibis/ 1885, p. 439.] 
380. PlCUMNUS MINUTE'S. 
Pipra minuta, Linn. Syst. Nat. i. p. 340? 
Picumnus minutus, Cab. in Schomb. Guiana, iii. p. 714. 
Camacusa, Merume Mountains, Roraima (3500-4000ft.). 
