THE GROUSE-LOCUSTS. 
187 
5. Tetrix sordida. Sordid Grouse-locust. 
Yellowish ash-colored; thorax with minute elevated black 
points; wings, in both sexes, rather longer than the thorax. 
Length from inch to nearly u 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. Antennce 22-jointed; eyes hardly prominent^ top of the 
head not horizontal between theni^ hut curving towards the fronts 
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 bodv blackish ; thorax vellowish 
clay-colored, shorter than the Avings, but longer than the 
body; wing-covers Avith a small AAdiite spot at the tips ; male 
Avith the face and the edojes of the lateral marmns of the tho- 
rax yellow. Length from to of an inch. 
This species AA^as first described by Mr. Say under the 
name of Acrydium later ale.* I liaA^e taken it from the mid¬ 
dle of April to the middle of ^-lay. It A^aries in being darker 
above sometimes. 
7. Tetrix parvipennis. (Fig. 82.) Small-winged Grouse-locust. 
Dark broAvn; sides blackish; thorax clay-colored or pale 
brown, about as long as the body; wing-coA’ers 
with a small Avhite spot at the tips ; Avings much 
shorter than the tliorax ; male AAuth the face and 
the edges of the lateral margins of the thorax 
yellow. Length from to more than 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 haA^e found 
the pupae near the end of July. 
* American Entomology', A'ol. I. Plate 5. 
[ Color and style of marking is of very little value in separating the species 
of Tetrix^ and the species described by Dr. Harris are probably all referable to the 
two species of Say. — Uhler.] 
