60 THE: ACRIDIIDAE OF MINNESOTA 
Psinidia fenestralis Serv. 
Psinidia fenestralis is primarily an insect of sandy places and is 
commonly found only on sandy margins of streams or sandy fields, 
associated with the sand bur, Cenchrus carolinianus. The wing colora- 
tion varies from orange to light shades of coral-red and rarely speci- 
mens are taken with the colored area yellow. The flight differs from 
that of Trimerotropis in being low and direct, but is not as swift as in 
Mestobregma. The male has a faint aerial stridulation. The colora- 
tion of this insect is such that when on its normal habitat of almost 
clear sand, with scattered vegetation and a background of broken 
lights and shadows, its detection is almost impossible. We have often 
been unable to see the insects even when within a few inches of them, 
except by the movements or by the shadows they cast. The species oc- 
curs throughout eastern Iowa in sandy localities, but has as yet been 
taken only in the southeastern part of Minnesota, along the Mississippi 
River at Red Wing, Lake City, and Winona. 
TRIMEROTROPIS Stal. 
Trimerotropis is medium or large in size; the body compressed. 
The pronotum compressed before the middle and narrower anteriorly 
than behind, its median carina low, especially on the metazona and 
broken before the middle by two wide notches; lateral carinae rounded 
and indistinct. Head slightly exceeding the prozona in width; vertex 
longer than broad with lateral carinae distinct, gradually converging, 
and continuous with the sides of the frontal costa, which is strongly 
sulcate, at least below ; median carinae of vertex faint or obsolescent ; 
foveolae small and shallow but distinct and triangular. Tegmina 
longer than the abdomen in both sexes; wings with the basal area yel- 
low, outwardly bounded by a curved black or fuscous band. The 
genus reaches its greatest development in the West and we have within 
our borders but two species, which may be separated by the following 
characters: 
Tegmina minutely maculate, the spots not aggregated into groups or bands extend- 
ing across the surface; frontal costa sulcate as strongly below as above the 
ocellus; hind tibiae yellow maritima 
Tegmina fasciate usually with solid and well-defined bands; frontal costa sulcate 
above the ocellus for a short distance only; hind tibiae red or orange 
citrina 
Trimerotropis maritima Harr. 
Trimerotropis maritima is very distinctly a lover of open, sandy 
areas and occurs in some abundance on the sandy flats of the Mis- 
sissippi and other streams in the southeastern part of the State. It is 
