SUBFAMILY ACRIDINAE 75 
mens, will serve to distinguish the species occurring within our area: 
a Tegmina conspicuously shorter than the abdomen, often no longer than the 
pronotum; furcula usually feebly developed. 
b Cerci of male, beyond the middle, tapering or subequal, not expanded at tip 
and never styliform 
c Subgenital of male short and broad, its apical breadth equaling or even 
surpassing the length of its lateral margin; prozona longer than broad; 
furcula feebly developed scudderi 
ce Subgenital of male narrower than long, subpyramidal, broadly and roundly 
elevated at apex; furcula well developed dawsont 
bb Cerci of male expanded apically, the tip at least broader than the middle, 
spatulate or subspatulate 
c Mesosternal interval of male quadrate or subquadrate; subgenital of male 
distinctly narrower than long; cerci of male stout fasciatus 
cc Mesosternal interval of male nearly (or sometimes more than) twice as 
long as broad 
d Subgenital plate of male short and broad, the apical breadth equaling 
or surpassing the length of the lateral margin; lobes of furcula longer 
than broad blatchleyi 
dd Subgenital plate of male distinctly narrower than long, often narrowing 
apically; furcula a pair of short, approximate, rounded lobules; 
posterior margin of pronotum distinctly emarginate in middle 
gracilis 
aa ‘Tegmina nearly or quite as long as the abdomen, or even exceeding this; the 
furcula usually well developed 
b Cerci of male rapidly expanding from base to middle, short and not expanded 
apically; furcula of minute, triangular denticles occidentalis 
bb Cerci of male tapering from base toward middle, generally long and 
slender 
c Cerci of male, beyond the middle, either slender or tapering, never 
bifurcate at tip 
d Subgenital of male as broad as the marginal length or nearly so; its 
apical margin notched; cerci relatively broad, nearly equally so 
throughout; mesosternum of male with a central swelling anterior to 
the lobes 
e Tegmina extending behind the posterior femora by not more than the 
length of the pronotum; prozona of male quadrate or subquadrate; 
cerci of male usually nearly twice as long as broad atlantis 
ce Tegmina extending behind the posterior femora by the length of the 
pronotum or more; prozona of male strongly transverse; cerci of 
male not more than half as long again as broad _ Spretus 
dd Subgenital of male variable but usually narrower than long, its apical 
margin entire; cerci usually long 
e Subgenital of male as broad, or nearly as broad, at apex as at base, 
generally elevated apically 
f Interval between mesosternal lobes of male longer than broad, 
much narrower than the lobes 
g Cerci of male very feebly incurved apically; subgenital of male 
relatively broad; hind tibiae red : dawsont 
gg Cerci of male strongly and abruptly incurved apically; subgenital 
of male relatively narrow, though short gladstont 
ff Interval between the mesosternal lobes of male quadrate or even’ 
transverse and but little narrower than the lobes; cerci scarcely 
or not at all narrowed on apical half, far surpassing supra-anal 
plate; furcula minute fasciatus 
ce Subgenital of male conspicuously narrower at apex than at base, 
rarely elevated apically above lateral margins ; never notched; cerci 
of male narrowed distally . 
f Distal half of male cerci much less than half as broad as extreme 
base: mesosternal interval of male twice as long as broad; 
tegmina usually well developed femur-rubrum 
f Distal half of male cerci distinctly more than half as broad as 
the extreme base; mesosternal interval of male scarcely, if at all, 
longer than broad; tegmina usually not attaining the tip of the 
