Skvua. NATATORES. CATARACTES. 523 
tail. Legs blotched with yellow; front of the tarsus 
scutellated, the back part reticulated with small pointed 
conical scales, giving it a roughness to the feel—Both 
sexes are alike. 
PiaTE 101. The bird of the year, in the natural size; from 
a specimen obtained on the coast of Northumberland. 
Head and neck clove-brown, with strie of pale yellowish- 
brown ; most conspicuous upon the ear-coverts and hind 
part of the neck. Back, wing-coverts, and scapulars, 
deep clove-brown ; the feathers being tipped with yel- 
lowish-white, inclining upon the ridges of the wings to 
yellowish-brown. Quills brownish-black, with the lower 
part of the inner webs and shafts white. Tail the 
same; the two middle feathers about half an inch longer 
than the rest, and sharp pointed. Under plumage pale 
clove-brown, undulated with yellowish-white and pale 
wood-brown. Legs having the posterior part of the 
webs and toes yellowish-white, the front part and claws 
black. 
In this, and a still farther advanced state, it answers to 
the Black-toed Guill of our authors. 
Genus PROCELLARIA, Zinn. PETREL. 
GENERIC CHARACTERS. 
Bix strong, straight, thick, subcylindrical; the upper 
mandible broader than deep at the base; tip distinct, com- 
pressed, arched, and hooked; lower mandible laterally fur- 
rowed, with a distinct, semi-truncate, and angulated tip, 
much compressed, and fitting into the hooked dertrum of 
the upper mandible. Tomia of both mandibles sharp; those 
of the upper slightly overlapping the under ones. Nostrils 
Te 
Young. 
