26 THE ACRIDIIDAE OF MINNESOTA 
Fergus Falls, Detroit, Ada, Crookston, Pipestone, Redwood Falls, 
Lake of the Woods, Bemidji, Biwabik, and Vermillion Lake. 
MECOSTETHUS Fieb. 
Insects of large or medium size, slender, and more or less com- 
pressed, for the most part brownish or yellowish in coloration and 
very local in habitat. The vertex is horizontal, sometimes slightly 
declivent, produced anteriorly to the eyes for a distance considerably 
greater than the width of one of the eyes; disk of vertex rather broadly 
triangular and acute or obtuse at apex; median carina distinct, stronger 
anteriorly ; lateral carinae rather strong; lateral foveolae minute, shal- 
low, and widely separated, visible from above, though sometimes al- 
most obsolete. The antennae are as long as the head and pronotum 
together in the female and much longer in the male. They are filiform 
though sometimes somewhat depressed basally. The disk of the 
pronotum is plane with all the carinae distinct, the median cut at or in 
advance of the middle. The lateral carinae are also cut at or before 
the middle, usually by two sulci. The anterior margin of the pronotum 
is truncate or very broadly angulate, the posterior margin very ob- 
tusely angulate. The tegmina are well developed in both sexes, the 
posterior femora long and moderately slender. The subgenital of the 
male is acutely produced and nearly horizontal. 
Our species may be separated as follows: 
Prozona shorter than the metazona; lateral carinae strongly sulcate and divergent 
from the first sulcus to the posterior margin 
Scapular area of the tegmina with a pale streak; intercalary vein of male 
with very obscure low teeth : lineatus 
Scapular area of tegmina without a pale streak; intercalary vein of male with 
sharp, elevated, minute, closely set teeth gracilis 
Prozona not shorter than the metazona; lateral carinae nearly straight and very 
gently divergent platypterus 
Mecostethus lineatus Scudd. 
Mecostethus lineatus is a very rare insect and has been reported 
from but few localities, ranging from New England to northern In- 
diana, Illinois, and Iowa. It is an unusually trim and attractive locust, 
rather large in size and, while its general coloration is rather somber, 
the touches of coral-red tend to make it a very handsome insect. The 
general color is a rather dark brown but a narrow yellowish line 
extends from behind the eye to, and sometimes more or less distinctly 
along, the lateral carinae of the pronotum. This line is bordered below 
by a rather broad dark streak. In most specimens there are also one 
or two oblique, anteriorly descending, yellow lines on the face and 
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