INTRODUCTION. 
C. A third section consists of a single species, distinguished by the yellow, varied with 
crimson, of the whole of its under surface; by the deep crimson of the space between its 
shoulders, as well as of its upper tail-coverts; by the white of the upper part of its throat and 
of the sides of its head ; and especially by the absence of barbs from the feathers of the last- 
named parts, and of the head generally, the shafts being so spread out, on the upper part of the 
head particularly, as to have the flattened and curled appearance of ebony shavings. It is the 
6 . Pter. ulocomiis ; with the bill crimson, blue, purplish red, and yellow, in longitudinal 
masses. 
D. A fourth section of the Ara^aris may be distinguished by the birds composing it 
having the throat, breast, and belly of a single colour, different from that of the upper surface. 
In the first of the species comprised in it the colours of the hinder part of the trunk are 
singularly counterchanged, the upper tail-coverts being yellow, while the under are crimson; 
whereas in all the other Ara^aris in which these feathers differ in colour, it is the upper that 
are crimson, and the under that are yellow. The species are 
7. Pter. Jiypoglauciis ; with the under surface, except the tail-coverts and the hinder part 
of the neck, blueish grey. 
8. Pter. Bailloni ; with the under surface, sides of the face, and forehead yellow. 
E. In the fifth section of the Ara^aris are comprehended two species, in which the whole 
of the under surface, except the throat, is yellow or greenish yellow ; the upper tail-coverts 
are, as usual, crimson; and the head and neck are of a much darker colour than the rest of 
the body. The colour of the head and neck in the birds of all the preceding sections is 
similar in both sexes : in those of the present section, these parts are black in the males and 
brown in the females. 
9. Pter. viridis ; with the upper mandible yellow above and chestnut below, and the 
lower mandible black throughout, except at its base. 
10 . Pter. inscriptus ; with the bill yellow, black on its culmen, at its tip and base, and 
blotched with black along its cutting edges. 
F. The sixth section of the Ara^aris agrees with the preceding one in having the 
anterior part of the birds comprised in it of a darker colour than the remainder of the plumage, 
and in having those parts which are black in the males differently coloured in the females, 
except the back of the head in one species. The dark colour of the under surface extends 
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