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



necticut Locustidcc, and the ovipositor which is sword-shaped. 

 The ocelli are usually wanting. 



The mouth-parts are well developed, with long, pointed 

 mandibles. The stridulating or musical organ of the male is 

 situated at the base of the tegmina. Each tegmen is furnished 

 with a small transparent area, the upper one being crossed by 

 a vein with minute, file-like teeth on the under side. The sound 

 is made by rubbing these teeth on the upper side of the lower 

 wing cover. Each species of Locustidcc has a distinct note by 

 which it is possible to distinguish it, and many have two calls, 

 one of which they use during the day and the other at night. 

 The ear of the katydid, when present, is situated on the front 

 leg near the basal end of the tibia, and consists of an oval cavity 

 covered with a transparent membrane. 



In the length of the antennae, the structure of the organs of 

 sound, and the auditory organs, the Locustidcc resemble the fol- 

 lowing family, Gryllidcc ; but the former differ in having the 

 sword-shaped ovipositor, and in the wing covers which slope 

 obliquely downward at the sides, while in the Gryllidcc the wing 

 covers are more flat dorsally, and are bent down over the sides 

 of the abdomen at nearly right angles. 



There are six sub-families of Locustidcc occurring in the 

 United States, five of which are represented in Connecticut. 



Key to Sub-families. 



1. Tegmina and wings present 2 



Tegmina and wings absent, or the former rudimentary 4 



2. Prosternal spines present ; vertex terminating in a 



sharp, flat spine, or produced upward and forward in 

 a rounded tubercle or prominent cone ; hind tibiae 

 without apical spines or with one on outer side only 3 

 Prosternal spines absent ; vertex rounded or deflexed, 

 without spine, tubercle, or cone ; tegmina always 

 shorter than wings ; hind tibiae with an apical spine on 

 each side phaneropterin^ p. 125 



3. Wing covers leaf-like, broadly expanded in the middle, 



concave within, longer than the wings ; vertex termi- 

 nating in a sharp, flat spine ; pronotum crossed by two 



distinct transverse sulci pseudophyllin^ p. 131 



Wing covers narrow, expanding but little if any in the 



