34 THE ACRIDIIDAE OF MINNESOTA 
Wings blackish, with a light-colored marginal area Dissosteira 
Wings yellowish with a fuscous, arcuate median band Spharagemon 
Carina of pronotum cut by two transverse sulci 
Inferior margin of lateral lobes of pronotum oblique; posterior angle 
acute or produced 
Lateral canthi of metazona terminating at the principal sulcus or else 
there diverted; tegmina maculate with two large squarish fuscous 
areas Mestobregma 
Lateral canthi of metazona passing and not diverted by principal sulcus; 
proximal half of tegmina coriaceous; antennae long and _ basally 
flattened Psinidia 
Inferior margin of lateral lobes of pronotum horizontal posteriorly; an- 
teriorly oblique; posterior angle rounded or rectangulate 
Radiate veins of anal field of wing normal; hind tibiae unicolorous or 
but slightly paler basally Trimerotropis 
Radiate veins of anal field of wing distinctly incrassate; hind tibiae 
with dusky or blackish bands Circotettix 
ARPHIA Stal. 
Our species of Arphia are all insects of rather more than medium 
size with the body more or less compressed and of dull brown, fuscous, 
or sometimes luteous coloration. The vertex is horizontal, subtriangu- 
lar, triangular, or sometimes nearly pentagonal, the disk having a dis- 
tinct curved transverse impression behind the middle; the median ca- 
rina extends back from this impression and the lateral carinae are dis- 
tinct and well marked; foveolae are rather large, shallow, triangular, 
or rhomboidal. The antennae are rather long, being about the length 
of the head and pronotum together. The pronotum has the disk 
heavily granulate or rugose, the anterior margin broadly and obtusely 
angulate, the posterior margin also obtusely angulate. The pronotum 
is narrowed at the principal sulcus and considerably widened posterior 
to this; prozona very short; median carina very strong and cristiform, 
very faintly or not distinctly notched by the principal sulcus; the lat- 
eral carinae rounded, visible only on the metazona; lateral lobes of 
the pronotum deeper than long, anterior margin somewhat sinuate, 
posterior margin somewhat oblique, nearly straight though somewhat 
sinuate just below the humeri, and the lower corner rounded. Teg- 
mina ample, coriaceous, densely and irregularly reticulate; wings 
bright red or yellow through most of the field, with a dark curved bar 
extending from the costal margin to a point near the anal angle, which 
it does not meet. Near the costa there is, in most species, a more or 
less well-marked ray projecting toward the base of the wing, and the 
tip of the wing is usually clear or slightly clouded. Hind femora rather 
stout, the basal half compressed and dilated, strongly carinate above; 
hind tibiae are variable in coloration and often somewhat annulate. 
Our species are all of very similar general appearance and of nearly 
uniform size. Certain of the species are extremely closely related 
