230 
Dr, Kidd on the 
nearly equal in length to each other, and a tarsus, which con- 
sists of two long and an intermediate short joint ; the last 
joint terminated' by two curved spines. There are several 
sharp, hard, straight spines near the angle made by the 
union of the tibia with the tarsus ; some of which being 
directed downwards, give the insect a firmer hold in walking. 
The hind legs bear a general resemblance to the middle 
legs ; hut the coxa, femur, and tibia, the femur especially, 
are much larger and stronger ; the relative position of the 
parts with respect to each other is the same as that of the 
middle legs ; but their general direction, instead of being at 
right angles to that of the abdomen, is parallel to it. In 
addition to several sharp spines placed about the joint of the 
tibia and tarsus, and directed downwards as in the middle 
legs, there are four or five others placed at the back of the 
tibia near its lower extremity, and pointing slightly down- 
wards. The structure of the tarsus scarcely differs from that 
of the middle leg. These hind legs are evidently the great 
instruments of progressive or retrogressive motion. 
The wings. There are two pair of wings : the upper pair 
arising from each side of the first segment of the abdomen 
partially cover the lower pair, which arise from each side 
of the second segment. In several instances I found adher- 
ing to the body, in the vicinity of the roots of the wings, a 
minute parasytic insect of a light scarlet colour ; the number 
of these parasytic insects rarely exceeded eight or ten in the 
same mole-cricket, but in one instance .1 counted nearly 
forty.* 
The upper wings in the full-grown mole-cricket are not 
• Vide fig. 5 a. 
