350 FAMILY VI. ACRIDID.E. THE LOCUSTS. 



late concavity, female; foveolre present as small rounded or oval 

 pits ; frontal costa prominent but scarcely sulcate above the ocel- 

 lus, less convex and more strongly sulcate below it; antennae of 

 male usually half or more the length of body; disk of pronotum as 

 in generic key, the surface flat or nearly so; median carina low, 

 of equal height throughout, usually cut only by the last trans- 

 verse sulcus ; prozona one-third to one-half as long again as rneta- 

 zona, the latter with surface finely and densely punctate, its hind 

 margin obtusely angulate or bluntly rounded ; lateral lobes ver- 

 tical, longer than deep, the lower margin with its front half 

 strongly ascending; tegmina and wings variable in length, but in 

 our species always much longer than the pronotum; hind femora 

 of average stoutness, equalling or more usually surpassing the 

 tip of abdomen ; subgenital plate of male short, of subequal width 

 throughout; valves of ovipositor strongly exserted, the edges of 

 upper ones crenate, of lower ones smooth. 



Kirby (1910, 50.")) recognizes seven species, some of which are 

 synonyms. Two species and two varieties or races occur in our 

 territory. The genus is very close to Mclointplus and seems to be 

 connected with it by the variety P. a. paroxyoides Scudd. How- 

 ever, the species have a fades which is easily recognizable after a 

 slight acquaintance, this being due largely to the slender, straight, 

 parallel form. 



KEY TO EASTERN FORMS OF I'AROXYA. 



a. Body shorter, of female rarely over 28 mm.; antennae of male shorter 

 than hind femora; tegmina at least as long as abdomen, male, often 

 slightly shorter, female. 



b. Inner upper face of hind femora nearly uniform in color, not or 



indistinctly barred with fuscous; form more slender, typical 

 of the genus. 15G. ATLAXTICA. 



bb. Inner upper face of hind femora with three fuscous bars and 

 outer face often trifasciate with pale and dark bars (Fig. 122) ; 

 form stouter, much resembling that of Melanoplus. 



156a. PABOXYOIDES. 



aa. Body longer, of female usually 30 or more mm.; antenna^ of male 

 longer than hind femora; tegmina variable in length. 



c. Tegmina normally as long as abdomen, male, often slightly 



shorter, female; furcula relatively slender, subcylindrical, their 

 inner margins not attingent; cerci of male with tips broadly 

 rounded ; sides of apical margins of subgenital plate not ele- 

 vated. 157. CLAVVLK;ER. 

 cc. Tegmina covering at most two-thirds of abdomen; furcula stouter, 

 more depressed, their basal halves attingent (PI. IV. t ) ; cerci 

 with tips subtruncate, feebly emarginate; sides of apical mar- 

 gins of subgenital plate elevated and somewhat flaring. 



157a. HOOSIERI. 



