94 CERTAIN PARASITIC INSECTS. 
feathers of the Red-shouldered Hawk. It is honey-yellow, 
and the abdomen is whitish, with triangular chitinous plates 
on each segment, the two on the segment next to the last 
forming a continuous band. The head is longer than broad, 
with the trabecule (or movable horny process just in front 
of the antenne), as long as the two basal joints of the anten- 
ne, and extending to the middle of the second joint; the 
basal joint of the antenne is rather thick, and the second 
joint is as long as the two terminal ones. 
Another species ( Docophorus hamatus n. ep, P1. T; fie; 1j 
taken from the Snow Bunting ( Plectrophanes nivalis) by 
Mr. C. A. Walker, Feb. 10, 1869, is white and has a large 
triangular head, with a very narrow 
prothorax, not much more than one- 
half as wide as the head; the abdo- 
men is rounded oval, while the trabe- 
cule are very long and hooked. 
An undescribed species of Nirmus 
(N. thoracicus; Pl. I, fig. 5) found on 
the Snow Bunting, is a large white 
form with the prothorax remarkably 
large, and but slightly narrower than 
the head, which is triangular. A nar- 
row dark line extends along each side 
of the head and body. The trabe- 
culæ are large, placed near the front of the head, and the 
antennæ in our specimens appear to be remarkably short, 
Louse of Domestic Fowl, 
being only one-half as large as the trabeculæ and not reaching . 
to the outer edge of the head. "The abdomen is long, ovate. 
The common barn-yard fowl is infested by a louse that we 
may call Goniocotes Burnettii (Fig. 27), in honor of the late 
Dr. W. I. Burnett, a young and talented naturalist and phys- 
iologist, who paid more attention than any one else in this 
country to the study of these parasites, and made a large 
collection of them, now in the museum of the Boston Society 
of Natura] History. It differs from the G. hologaster of 
Tov vem mde a ce tg eur RUETNEE 
