NO. 1530. THE DECTICIN^ OF NORTH AMERICA— CA UDELL. 289 



lr>. Lateral lobes of the pronotum not well developed (figs. 54, 56); anterior tibiae 



of the female rarely with more than one dorsal spine Afeloplnn, p. 368 



Lateral .lobes of the pronotum well developed (tig. 60, etc.); anterior tibijf of 

 both sexes with more than one dorsal spine 16 



16. Elytra of the female not projecting beyond the pronotum, of the male rarely 



projecting one-half the length of the pronotum 17 



Elytra of the female projecting somewhat beyond the pronotum, oi the male 

 projecting one-half or more than- one-half the length of the pronotum. 



Idiosldfu.'i, p. 373 



17. Size large, pronotum 12 mm. or more in length; pronotum with distinct lateral 



and median cariii;e on tlie posteri(jr half; posterior femora less than two and 

 one-half times as long as the pronotum; ovipositor curved lightly upward. 



Anabrus, p. 351 

 Size smaller, pronotum 8 mm. or less in length; pronotum without carinte on 

 the posterior half; posterior femora more than two and one-half times as long 

 as the pronotum; ovipositor usually more noticeably curved upward. 



Ercmopedes, p. 330 



18. Posterior femora short, less than twice as long as the pronotum 19 



Posterior femora long, twice or more, usually much more than twice as long as 



the pronotum 21 



19. Pronotum posteriorly truncate, the lateral cariiue dull, straight, posteriorly some- 



what divergent Penmahrus, p. 362 



Pronotum posteriorly rounded, the lateral carina' sharp, inirved outward mesi- 

 ally 20 



20. Posterior tibias with two apical spines beneath; pronotum with low but persis- 



tent median carina; posterior femora much swollen basally, there more than 



twice as broad as apically Aglaothora.r, p. 290 



Posterior tibi;o with four apical spines below; pronotum with the median carina 

 distinct only posteriorly; posterior femora less swollen basally, there less than 

 twice as broad as apically Phujiostira gilldtei; p. 392 



21. Posterior tibi;e with two apical spines below; pronotum as in figs. 2 and 4. 



Aglaothorax diabolicus, p. 294 

 Posterior til )ia' with four aj^ical spines below ; pronotum not as in figs. 2 and 4 . . 22 



22. Lateral lobes of the pronotum declivent, slightly so in Steiro.rys; posterior femora 



three or more times as long as the pronotum, much swollen in the basal half; 



ovipositor curved upwards or straight. 24 



Lateral lobes of the prothorax perpendicular, or almost so; posterior femora little 

 if any more than twice as long as the pronotum 23 



23. Po.sterior femora very little swollen in the basal half; ovipositor curved down- 



wards Phigiostira, p. 388 



Posterior femora^ conspicuously swollen in the basal half; ovipositor curved up- 

 wards Platydek, p. 403 



24. Lateral cariiife of the pronotum bowed inward in the anterior half, posteriorly 



divergent, the disk of the pronotum considerably broader behind than at the 

 middle of the anterior half (fig. 79); median carina scarcely indicated even pos- 

 teriorly Iilionotiis, p. 394 



Lateral cariuie of the pronotum parallel, or nearly so, sometime slightly conver- 

 gent in the anterior fifth (fig. 83), the disk little broader behind than else- 

 where; median carina distinct and percurrent 25 



25. Elytra well developed, overlapping above and projecting about one-half the 



length of the pronotum in both sexes 26 



Elytra of the female forming slightly projecting lateral pads, widely separated 



above ,., Steiroxys, p. 404 



Proc. N. M. vol. xxxii— 07 19 



