138 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL.XX 



g' 2 . Furcula of male absent; apical margin of subgenital plate not ele- 

 vated above the lateral margins 119. collinus (p. 346). 



e~ 2 . Size medium or large; cerci of male rarely bifurcate or with an inferior 

 process (and then the insect is of large size, which it never is in the alter- 

 nate category, and the supraanal plate is distinctly shield-shaped, the apical 

 half tapering with much greater rapidity than the basal; or the furcula is 

 absent; or the interval between the mesostenml lobes of the male is three 

 times as long as broad, which it never is in the alternate category) ; supra- 

 anal plate of variable shape; furcula either absent or very minutely 

 developed; prosternal spine tisually long. 



f l . Interval between mesosternal lobes of male nearly, fully, or much 

 more than twice as long as broad ; of female generally longer than broad, 

 rarely quadrate ; prosternal spine generally long; tegmina usually clear, 

 or with a marked distinction in color between the dorsal and lateral areas, 

 or with the angle between the two marked by a conspicuous light-colored 

 stripe; head less prominent and with less prominent eyes in the male than 

 in the alternate category, the front margin of the pronotum in no way 

 flaring to receive the head. 



g l . Furcula of male entirely absent, or present only as a minute point 

 or bead ; hind tibiae usually yellow, but sometimes red (26. Robustus 

 series). 



h l . Tegmina fully equal to or surpassing the hind femora; hind tibiae 

 yellow. 



i ' . Cerci of male boot-shaped, the apical foot as long as the basal leg, 

 the apical margin deeply emarginate below ; markings of the outer 

 face of hind femora so run together as to be more longitudinal than 



transverse 120. diffcrentlalis (p. 349). 



i-. Cerci of male apically expanded only a little more above than 

 below, the apical margin regularly or almost regularly convex; 

 markings of outer face of hind femora transverse. 



121. robustus (p. 354). 



fr 2 . Tegmina somewhat abbreviated, not reaching the extremity of 

 the hind femora; hind tibiae red or reddish yellow. 

 i 1 . Apical margin of male cerci convex or augulato-convex. 

 j l . Tegmina distinctly and considerably spotted with fuscous on 

 the lateral face ; cerci of male nearly equal on proximal half, the 



apical margin convex 122. viola (p. 355). 



j-. Tegmina almost uniformly fuscous on lateral face ; cerci of male 

 distinctly tapering on proximal half, the apical margin broadly 



angulate 123. clypeatm (p. 357). 



i 3 . Male cerci apically forked, the apical border being deeply 



emarginate 124. furcatns (p. 358). 



g". Furcula of male distinctly present, though always very small, angu- 

 late, the angle rarely produced; hind tibiae never yellow, usually red, 

 rarely purplish and yellow at tip (27. Bivittatus series). 



7t l . Interval between mesosternal lobes of male distinctly more than 

 twice as long as broad; pronotum with conspicuous light-colored 

 lateral stripes on the disk, their outer margin at the position of lateral 

 carinae. 



i 1 . Cerci of male very much more expanded apically above than 

 below, the apical border slightly emargiuate below. 



j*. Hind tibiae clear red throughout 125. fcmoratus (p. 360). 



/-. Hind tibiae purplish basally, yellow, rarely reddish, apically. 



126. Innltatns (p. 363). 

 i : . Cerci of male apically expanded but little more above than below ; 



the apical border convex, with no emargiuatioii below 



127. thomaki (p. 368). 



