10 THE ACRIDIIDAE OF MINNESOTA 
in which the dorsum is unmarked, although commonly there are four 
dark spots arranged on the disk of the pronotum and occasionally a 
light-colored mid-dorsal line. This species was first noted by us at 
Cass Lake, July 24, 1912, when it was abundant in both adult and im- 
mature forms. It was most plentiful in a spot evidently flooded at 
times but not marshy. At that time it was simply moist soil covered 
with a turf of Trifolium repens among which were scattered plants of 
Polygonum, Mentha, and Parnassia. The insect was noted feeding on 
Trifolium and apparently also on algae, as Hancock has described un- 
der Tettix. It moves by short, low hops, not at all like the vigorous 
and surprisingly powerful hop of Tettix. The species has been taken 
at Pipestone, St. Anthony Park, Mahtomedi, Cass Lake, Bena, and 
Tower. 
TETTIX Charp. 
Tettix includes insects of relatively small size with the body more 
or less rugulose granulate. The vertex, when viewed from above, is 
wider than one of the eyes and, viewed laterally, more or less sinuate; 
the anterior border angulate, subconvex, or subtruncate; viewed lat- 
erally more or less produced before the eyes. Antennae stout, not 
reaching to the shoulders, and made up of from 12 to 14 joints. The- 
dorsum of the pronotum may be subcompressed, flattened, tectiform, 
subconvex, or slizhtly depressed. Pronotum truncate or but slizhtly 
subangulate anteriorly; posteriorly more or less attenuate and acute, 
the apical process sometimes abbreviate. Femora entire or with mar- 
gins more or less undulate; posterior tibiae slightly enlarged apically; 
carinae serrulate, short, and spinose. The first joint of the posterior 
tarsi distinctly longer than the third; pulvilli flat below or subspiculate. 
Most of the species of this interesting group occur in two forms, 
those of the common or extended form and those in which the pro- 
notum is more or less abbreviated. These, while evidently mere 
forms, have been given varietal names as shown in the table. The 
insects are all small and of obscure coloration, though in some forms 
there 1s a well-marked color pattern. The colors, however, are so va- 
riable as to be of no value in separation of species. 
Median carina of pronotum distinctly elevated, percurrent; the dorsum more 
or less tectiform 
Body slender; pronotal process posteriorly attenuate 
Vertex, viewed from above, obtuse angulate; frontal costa, viewed in profile, 
slightly sinuate granulatus 
Pronotum and wings abbreviate Var. variegatus 
Vertex, viewed from above, convex; frontal costa, viewed in profile, not 
at all sinuate luggeri 
Body more robust; pronotal process and wings shorter 
Median carina of pronotum distinctly percurrent, slightly elevated anteriorly; 
