12 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL.XX. 



v 



broad as, or nearly as broad as, the lobes themselves; of the i'emale distinctly 

 or strongly transverse, fully as broad as or (and generally) broader than the 

 lobes; metasternal lobes of male generally distinctly distant, occasionally 

 approximate; of the female generally more distant, the interspace in the latter 

 generally as wide as or wider than the frontal costa; tegniina typically 

 abbreviate. 



e l . Face almost vertical; eyes small, but prominent and widely distant; pro- 

 notum constricted in the middle, with deeply impressed transverse sulci, and 

 the lateral lobes not obliquely truncate apically in front; distinct lateral 



carinae 20. Dendrotettix (p. 91). 



e 2 . Face a little oblique; eyes rather large, not very prominent, and not 

 greatly distant; pronotum not, or but feebly, constricted in the middle, 

 with generally feebly impressed transverse sulci and the lateral lobes 



obliquely truncate apically on the anterior section 21. Podisma (p. 94). 



If 1 . Pronotum of subequal width, the sides nearly parallel ; subgenital 



plate of male normal... Podisma, s.s. 



/ 2 . Pronotum enlarging posteriorly, conspicuously in the female; sub- 

 genital plate of male exceptionally expanded, laterally tumid and elevated 



premarginally Eupodisma.] 



d 2 . Interspace between mesosternal lobes generally longer or much longer 

 than broad in the male, almost never (see Melanoplus montanus and M. borealis) 

 in the least broader than long even when the sides of the interspace are 

 posteriorly divergent; generally quadrate in the female but more variable 

 than in the other sex, sometimes as narrow as there, more often subtransverse, 

 occasionally in some short-winged forms (asin Melanoplus artemisiae, M. mililaris, 

 M. altitudinum and Asemoplus montanus) distinctly transverse; in both sexes 

 always distinctly, generally much, narrower than the lobes (except in the 

 females of the cases just cited, where they are barely narrower) ; metasternal 

 lobes of male generally attiugent or subattingeut, rarely only approximate; 

 of the female less distant than in the alternate category (A 2 b z c ] d r ), generally 

 approximate or subapproximate, the interspace generally narrower than the 

 frontal costa; typically the tegmina are completely developed. 

 L/^ 1 . Face almost vertical or a little oblique, its angle with the fastiginm 

 rarely less than 75; eyes rounded oval, never more, generally less, than 

 half as long again as broad; portion of metasternum lyiug behind the lobes 

 transverse, more than twice as broad as long; tegmina normally present. 



l . Tegmina always present; sides of first abdominal segment with a dis- 

 tinct tympanum. 



/0 1 . Fastigium of vertex plane or convex; eyes separated widely, the 

 space between them twice as broad as the frontal costa; pronotum 

 furnished with distinct percurrent lateral cariuae; tegmina abbreviate; 



cerci apically acuminate 22. Paratylotropidia (p. 117). 



g 2 . Fastigium of vertex more or less depressed or with elevated lateral 

 margins; eyes separated narrowly, at most but little farther apart than 

 the width of the frontal costa; pronotum with indistinct 1 or no lateral 

 carinae; tegmina fully developed or abbreviate; cerci variable, rarely 

 acuminate apically. 



'. In/erior genicular lobe of hind femora with at least a darker basal 

 spot or transverse band; cerci of male variable, often enlarging 

 apically. 



,^. Dorsum of pronotum rarely or never twice as long as the average 

 breadth, generally only half as long again even in the male, gener- 

 ally constricted more or less in the middle; antennae even when 

 longest (as in Melanoplus nitidus and M. packardii, for instance) no 



In a few species they are tolerably distinct. 



