556 The University Science Bulletin. 



across the entire width of the sternum. The sternellum and the first 

 segment of the abdomen is completely hidden by them, and part of 

 the second and third segments of the latter are also covered. They 

 are contiguous along their inner margins, which fact, together with 

 their broad, basal attachment, gives them the appearance of great 

 rigidity. In shape they are roughly rectangular with their latero- 

 cephalic angle somewhat extended. 



The trochanter of the hind leg is similar to those of the first two 

 pairs of legs, in that it is an elbow-shaped segment and of the same 

 size as the others. 



The femur is a smooth, cylindrical-shaped segment, diagonally 

 attached to the trochanter. On its proximal lateroventral margin is 

 an obliciue protuberance (pi. LVIII, fig. 7), which, according to 

 Hansen (1890), occurs in all Cercopidae, but in no other Homoptera. 

 The knee joint is strengthened, as in the two anterior pairs of legs, 

 by the groove and side plates of the femur, which are very prominent 

 and show plainly in figures 7 and 8 (pi. LVIII). 



The tibia of the hind leg is greatly lengthened. Basally it is c^uite 

 narrow, but broadens to twice its width distad. Along its outer 

 margin it bears two large, thick spurs, which are of taxonomic im- 

 portance in distinguishing the family. The second of these is ap- 

 proximately twice the size of the first in both length and thickness. 

 The distal end of the tibia bears two rows of thick, sharply pointed 

 spines. The average number of spines, after counting twenty speci- 

 mens, was seven on the top row and eight on the lower. These spines 

 are shiny black at the tip and from between each two of them arises 

 a long, silken hair which is twice the length of the spines. 



The tarsus is composed of three segments, the first two of which 

 are similar in shape to the tibia, being narrow at the base and 

 spatulate at the tip. They also bear a row of spines on their distal 

 ends, which are like those of the tibia in shape and color but which 

 are only half as large. The average number of spines on the first 

 segment is seven, and on the second, nine to eleven. The distal 

 segment of the tarsus is swollen but not spatulate. 



THE ABDOMEN. 



The number of segments in both the male and female abdomens 

 is eleven plus a telson. From a dorsal and lateral view the abdomen 

 is not visible, since the sloping tegmina completely hide it. It can, 

 of course, be easily seen from a ventral view, but owing to the en- 

 larged hind legs, especially the coxae, and the fact that its segments 



