CERTAIN PARASITIC INSECTS. 95 
Europe, which lives on the same bird, in the short second 
joint of the antenns, which are also stouter; and in the 
long head, the clypeus being much longer and more acutely 
rounded ; while the head is less hollowed out at the insertion 
of the antenne. The abdomen is oval, and one-half as wide 
as long, with transverse, broad, irregular bands along the 
edges of the segments. The mandibles are short and straight, 
two toothed. The body is slightly yellowish, and variously 
streaked and banded with pitchy black. 
Of three species of Lipeurus, figured on the plate, fig. 2 
represents a male of the louse of a crow, L. corvi, a new spe- 
cies. Its body is unusually broad, and is white, with pitchy 
black lines along the side of the head and thorax, a row of 
small blackish oval spots along the abdomen, and a pair of 
narrow black bands on each thoracic ring. The head is 
broad and triangular, with large, curved, long trabecule, and 
a prominence just behind the antennz. The latter are slen- 
der and simple, with the two basal joints moderately large, 
and of equal size and length; the three terminal ones are 
slenderer; the third and fifth are of nearly the same length ; 
the fourth is shorter, and the fifth ends in a rather sharp 
point. The mandibles are slender, acute, and much curved. 
The legs are rather stout, with two very small claws, and a 
small thumb-like tubercle opposed to them. 
Another species ( L. elongatus, n. sp., Pl. I, fig. 4, 9) 
is allied to the L. baculus and squalidus of Europe. It is 
white, with pitchy black patches along the sides of the abdo- 
men, and at the base of the legs. The head is pitehy black 
along each side. The two basal joints of the antenns are 
of the same length; the third joint is a little larger and 
longer than the fourth, while the fifth is a third longer than 
the fourth, and is barrel-shaped. The third species (L. gra- 
cilis, n. sp., Pl. I, fig. 6, d) has a longer and narrower head 
with the clypeus more expanded and larger, and the edge 
of the body is dark, but the band is not so wide as in ZL. 
elongatus. There are two conical trabecule, and the antenne 
