INTRODUCTION. XXXI1 
‘the stigma is yellow or brown. These 
wings are hooked when the insect flies ; 
they form but one horizontal surface by 
means of aseries of little hooks disposed 
at their margin. 
To each of the three lower parts of 
the corslet are attached a pair of legs. 
‘They are connected by a moveable piece, 
long and conical, which we may term the 
hip. The posterior legs are the longest ; 
they are each divided into three principal 
parts —-the thigh, the leg, and the foot 
or tarsus; the latter is formed of five 
conical pieces, of unequal length, arti- 
culated together, and more or less hatry ; 
the tarsus is terminated by two hooks, 
between which lies a round substance, 
which we may regard as the sole of the 
foot. We remark, at the extremity of 
the leg, properly so called, a spine or spur, 
‘straight, strong, and smooth ; that on the 
anterior feet is slightly curved, and co- 
vered with stiff hair, where it is con- 
nected to the foot. The first piece of 
the tarsus, which is opposite the spur, 
presents a considerable curvature. It i 
a 5 
