ILLUSTRATIONS OF ORNITHOLOGY. 
Mr. Srrickianp sends us the descriptions of the four following 
birds :— 
«TJ am indebted to BE. Wilson, Esq., for the loan of several birds 
which he lately purchased at Paris, with the locality ‘Pérou’ in- 
scribed on the labels. They are all closely allied representatives 
of Brazilian forms, and I therefore have no doubt that they come 
from Bolivia, or some other region on the eastern slope of the 
Peruvian Andes. The west side of the Andes is inhabited by many 
peculiar generic forms, indicating a distinct zoological region, and 
rarely produces species so closely allied to Atlantic American ones 
as those now before us. Four of these interesting birds I now 
proceed to describe :”— 
MONASA FLAVIROSTRIS, Srricknann. 
CLosELy allied to the well known Monasa tranquilla of Brazil, 
but differs in its smaller size, the greener tint of the plumage, and 
in the beak being yellow instead of red, 
Plumage black, with a greenish gloss, becoming obscurely cine- 
reous on the belly ; covers of the ulnar portion of the wing white, 
forming a longitudinal streak when the wing is closed; beak wax- 
yellow ; feet and claws black. 
Total length, §.5; beak to front, 1.8; to gape, i.4; wing, 4.9; 
medial rectrices, 4.3; external, 3.7; tarsus, 7; middle toe and 
claw, ii}. r 
Inhabits Peru, 
