64 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



closed are partly extended horizontally along the top of the 

 abdomen and partly deflected against the sides. The hearing 

 organ when present is situated on the side of the first basal seg- 

 ment of the abdomen. The fore and middle pairs of legs are 

 nearly equal in size. The hind pair are much longer, with the 

 femora greatly enlarged for leaping. The tarsi of all the legs 

 are similar three-jointed, with a pair of curved claws on the 

 tip of the apical joint. Between these claws, excepting in the 

 Tettigincc, is a small pad called the pulvillus or arolium. The 

 ovipositor consists of four horny plates, one pair curving upward 

 and the other pair curving downward. In the male the lower 

 appendage consists of a single plate. 



The males only are furnished with stridulating or sound- 

 producing organs. The sound is produced in two ways. In one 

 group the sound or call is made only when the insects are at 

 rest, and is produced by rubbing the inner surface of the hind 

 femora over the upper surface of the tegmina. 



" Landois has shown that in this group the inner surface 

 of the femur is furnished, along the lower margin, with a longi- 

 tudinal row of minute, lancet-shaped, elastic teeth, ranging in 

 number from 85 to 93, which are scraped across the veins of 

 the tegmina, thus producing a low, buzzing sound. Those which 

 stridulate in this manner mostly belong to the sub-families Tryx- 

 alince and Acridina. 



" The members of the sub-family CEdipodincs usually sound 

 their call during flight by rubbing together the upper surface 

 of the front edge of the wings and the under surface of the 

 tegmina, thus producing a sharp, crackling sound which has 

 been likened to that of burning stubble. By paying close at- 

 tention the observer can soon learn to know each species by its 

 peculiar call." Blatchley. 



Key to Sub-families. 



i . Size large ; pronotum not extending over the abdomen ; 



claws of tarsi with pads between them 2 



Size smaller ; pronotum extending back over the abdo- 

 men; claws of tarsi without pads (pulvilli) between 

 them TETTIGIN^ p. 65 



