20 GIGLIOLI, ON PARASITICAL INSECTS FROM CHINA. 
The first joint is very thick and rounded, the convexity 
being outwards; on the basal portion of its inner side is 
a spine-like process; its proximal half is white, the rest 
chestnut-brown. The second and third joimts are much 
smaller, both bent, and forming an elbow with the first. A 
little behind the extremity of the third joint, on its outer 
side, are placed the two terminal pieces, which are the same 
as in the female, showing how the normal type is not alto- 
gether done away with. This last part performs the tactile 
functions which belong to the antenna, while the rest is used 
as a prehensile arm, and embraces the female during copu- 
lation. 
The eyes are prominent, lateral, and hemispherical, of 
moderate size. The mandibules are oblong, and bifid at 
their extremity, situated behind a large, rounded space, 
which is a suctorial apparatus. 
The thorax consists of two distinct segments, the pro- 
thorax and the metathorax; it is longer than the head, 
and gradually widens from above downwards; its sides are 
notched by a row of small tubercles. The metathorax is 
about three times as long as the prothorax, which sup- 
ports the anterior pair of legs. Dufour states that the 
inferior part of the metathorax is divided into three longi- 
tudinal portions in the males. These were not very distinct 
in the specimens I examined ; but the mesial dorsal groove, 
and the tuft of long, stiff, reddish hairs, directed back- 
wards on the anterior side of each of its posterior angles, 
were very distinct; each tuft consists of seven long sete; 
they are common to both sexes. 
The abdomen is longer than the head and thorax toge- 
ther; it is composed of nine segments, the last one being 
small and inconspicuous; in the male it forms a single 
truncated process, divided by a cleft, but not bifid; im the 
female it is deeply cleft, forming two processes, each pro- 
vided with two long setze, which had been broken off in my 
specimens. The inferior margin of each abdominal segment is 
bordered by a narrow white line. 
The anterior pair of legs are very short, thick, and strong, 
being evidently scansorial ; the middle and posterior pairs are 
much longer, especially the last; the cove are of moderate 
size ; the femora and tibie long and strong; the ¢arsi rudi- 
mentary, and terminated by two curved claws of equal size, 
and parallel. On the inner side of the distal extremity of 
the tiie in the anterior pair of legs is a pointed spine. 
This species is found on the Diomedea exulans and on the 
D. brachyura, and probably on the other species of Diomedea. 
