470 Report of the Department of Entomology of the 



some habits of the nymphs. 



Feeding habits. — During the daytime the nymphs are very 

 inactive and remain for the most part hidden in a curled leaf, with 

 the antennae stretched out in front and usually projecting beyond 

 the edge of the leaf as if to detect the approach of any intruder. 

 At night they are very active and crawl about to feed. They show 

 signs of restlessness as evening advances and continue on the move 

 throughout the night. 



Molting. — When a nymph prepares to molt it first fastens its 

 claws firmly in the bark or in the tissues of a leaf, extends the antennae 

 backward, and arches up the back. The skin splits along the dorsal 

 median line of the head and thorax. The head is bent down and 

 the thorax works out through the split. The fore and middle legs 

 are pulled out and exercised, while the palpi and antennae are still 

 held in the skin. The hind legs are pulled upward and forward. 

 The antennae are partly pulled out by straightening the body, and 

 then they are grasped by the mouth and worked out in the same 

 manner as noted in the process of hatching. When the hind legs 

 are free the nymph grasps the support and pulls out the hind part 

 of the abdomen. Later the skin is eaten by the insect if in the 

 meantime the discarded remnant has not been consumed by some 

 other cricket. 



MUSICAL STRUCTURES AND SONG OF ADULT. 



The males begin to sing very soon after reaching the adult stage. 

 In doing so they raise the front wings perpendicular to the body, 

 with the inner edge of the right lapped over the left, and vibrate 

 them rapidly in a transverse direction. The mechanism which 

 produces the sound is found near the base of the wing, the broad, 

 expanded distal part serving as a resonator to increase the volume 

 of sound. A short but prominent transverse vein, about one-fourth 

 way from the base, is modified beneath to form a minute filiform 

 rasp. It is about 2 mm. long and bears forty or fifty short teeth 

 inclined toward the opposite wing. Both wings have a rasp but 

 the right always laps over the left, the inner edge of which is thickened 

 at this point to serve as a scraper. From our observations the rasp 

 of the left wing and the scraper of the right wing are little if ever 

 used. 



