THE GROUSE-LOCUSTS. 
187 
5. Tetri x sordida. Sordid Grouse-locust. 
Yellowish asli-eolored ; thorax with minute elevated black 
points ; wings, in both sexes, rather longer than the thorax. 
Length from inch to nearly £ inch. 
I have taken this species both in May and September, and 
have received a specimen from Dr. D. S. C. H. Smith, of 
Sutton, Massachusetts. 
II. Antcnnm 22-jointed; eyes hardly prominent, top of the 
head not horizontal between them, but curving towards the front, 
with a very slightly projecting ridge; wings 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 tho- 
rax yellow. Length from to of an inch. 
This species was first described by Mr. Say under the 
name of Acrydium laterale.* I have taken it from the mid- 
dle of April to the middle of May. It varies in being darker 
above sometimes. 
7. Tetrix parvipennis. (Fig. 82.) 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 Fi «- 82 . 
shorter than the thorax ; male with the face and 
the edges of the lateral margins of the thorax 
yellow. Length from to more than 3 °, T inch. 19 
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. 
* American Entomology, Vol. I. Plate B. 
[ ^°^ 01 ft nd style of marking is of very little value in separating the species 
ot Tetrix, and the species described by Dr. Harris are probablv all referable to the 
wo species of Say. — Uiilish.] 
