28 



ORTHOPTERA. 



the extreme base of the tegmina densely reticu- 

 late, the intercalary vein distinct Gymnes, Scudder. 



ee. Head obscurely or not at all conical ; never, unless very 



feebly, ascending ; eyes seldom prominent ; face as 



seen from the side straight throughout or uniformly 



rounded, never angularly bent inward at the ocellus ; 



wings, as a rule, clear or apically faintly fuliginous. 



/. Head somewhat ascending; antennae of very unequal 



length in the two sexes ; pronotum with no lateral 



carinas, the median carina obsolete on the prozona; 



scapular area of $ tegmina conspicuously expanded 



so as to make the costal margin sinuate .... Bootettix, Bruner. 



ff. Head generally salient, rarely at all ascending; 



antennae subequal in the two sexes ; scapular ar>f a 



of £ tegmina slightly or not at all expanded. 



g. Antennae distinctly flattened (save in Amblytro- 



pidia), generally rather short ; fastigiurn of vertex 



usually rounded and without distinct lateral 



costulation, or, if distinct, then with a distinct 



median carina, generally continuing over the 



occiput, where it is sometimes accompanied by 



a pair of submedian carinse ; face rather strongly 



oblique; lateral carinse of pronotum usually 



parallel, sometimes converging mesially but 



without any or only the faintest constriction of 



the body of the pronotum. 



h. Disk of pronotum more or less clepsydral, the 



lateral carina? converging near the middle. 



i. Apical spurs on inner side of hind tibiae very 



unequal in length. 

 j. Antennae apically clavate ; lateral carinse of 

 pronotum subparallel; tegmina generally as 



long as the abdomen Eritettix, Bruner. 



jj. Antennse apically attenuate, though blunt; 



lateral carina? of pronotum considerably 



arcuate ; tegmina abbreviate. 



k. Hind margin of pronotum angulate or 



rotundo - angulate ; prozona but little 



longer than metazona Mesochloa, Scudder. 



hh. Disk of pronotum equal or subequal, the lateral 

 carina? being strictly parallel or diverging only 

 (and slightly) on the metazona. 

 i. Scapular area of tegmina in both sexes some- 

 what dilated, subhy aline, regularly areolate 

 with oblique veinlets. 



