ORTHOPTERA. 163 



have received a specimen from Dr. D. S. C. H. Smith, of Sut- 

 ton, Massachusetts. 



II. Antenyice 22-jointed ; eyes hardly prominent, top of the 

 head not horizontal between them, but curving towards the front, 

 with a very slightly projecting ridge; ivings smaller than in 

 those of the preceding group. 



6. Tetrix lateralis. Black-sided grouse-locust. 



Pale brown; sides of the body blackish; thorax yellowish 

 clay-colored, shorter than the wings, but longer than the body; 

 wing-covers with a small white spot at the tips; male with 

 the face and the edges of the lateral margins of the thorax 

 yellow. Length from ^^ to -^^ of an inch. 



This species was first described by Mr. Say under the name 

 of Acrydinm laterale* I have taken it from the middle of 

 April to the middle of May. It varies in being darker above 

 sometimes. 



7. Tetrix parvipennis. Small-winged grouse-locust. 



Dark brown; sides blackish; thorax clay-colored or pale 

 brown, about as long as the body; wing-covers with a small 

 white spot at the tips; wings much shorter than the thorax; 

 male with the face and the edges of the lateral margins of the 

 thorax yellow. Length from ^^ to more than 2^^^ inch. 



This species is much shorter and thicker than the Tetrix 

 lateralis. I have taken it in April and May, in the perfect 

 state, and have found the pupae near the end of July. 



The habits of the grouse-locusts are said to be absolutely 

 the same as those of other locusts. They seem, however, to 

 be more fond of heat, being generally found in grassy places, 

 on banks, by the sides of the road, and even on the naked 

 sands, exposed to the full influence of the sun throughout the 

 day. They are extremely agile, and consequently very difficult 

 to capture, for they leap to an astonishing distance, considering 

 their small size, being moreover aided in this motion by their 

 ample wings. The young, which are deprived of wings, are 



* American Entomology. Vol. I. plate 6. 



