132 PROCEEDiyGS OF THE NATIONAL MUSEUM. vouxx. 



nnm of male in front of lobes with a central swellinj^. f(»rniin>; a Miint 

 tubercle (5. irtahensis series). 



/«'. Apical margin of siibgcnital plate of male entire;' lobes of fiir- 

 cnla not exceptionally broad; snb^^enital [date greatly but not excess- 

 ively prolonged 

 »'. Interval between mesostemal lobes of male more than twice as 

 long as broad; of female a little longer than broad ; male cerci ni(»re 

 than twice as long ns broad; apical margin of subgenitai plate of 



male, as seen from behind, snbtrnncate IS. hniueri (p. Wl). 



i-. Interval between uiesosternal lobes of male much less than twice 

 as long as broad; of female transverse; male cerci less than twice 

 as long as broad ; apical margin of subgenitai plate of male, as seen 



from behind, rounded 19. exrehns (x». lOfJ), 



h-. Ai»ical niiirgiii of subgenitai plate of male deeply notched on either 

 side of the middle; lolies of furcula exce])tionally bntad, stibequal 

 throughout; subgenitai plate excessively prolonged. 



20. utahensis (p. IfiT). 

 /-. Apical margin of subgenitai plate of male mesially notched; mesoster- 

 nura of male in front of lobes with a central swelling, forming a blunt 

 tuber<le (G. Spretus series). 

 _(/'. Tegmina extending beyond hind femora, if at all, by not more than 

 the length of the ]>ronotum, generally by mu.'h less than that; prozona 

 of male quadrate or very feebly transverse; cerci of male generally 

 almost or ([uite twice as long as broad. 

 h^. Cerci of male regularly subfalciforuj, both margins being uni- 

 formly and distinctly curved rathe' than bent, and more than twice 



as Icmg as median breadth 21. alaakamia (it. 169). 



Ii-. Cerci of male nearly straight as viewed laterally, or slightly bent 

 upward in apical half, rather than curved, 

 i'. Cerci of male distinctlv more than twice as long as median 

 breadth, the a])ical half subeipial but narrower than the basal half. 

 j\ Hind tibiae normally pale glaucous; when red, pale red. 



kK Larger, robust; median carina usually as distinct between 

 the sulci as on the anterior portion of the prozona. 



22. affinis (p. 171). 

 A:-. Smaller, slender; median carina usually obsol«'t«' or sub- 

 obsolete between the sulci 23. intcymediits (p. 172). 



j-. Hind tibiae bright red 24. hUituratna (p. 171). 



i\ Cerci of male not more than twice as long as median breadth, 

 the ax>ical half not only narrower than the basal half, but itself 

 tapering throughout, obliciuely truncate beneath ; hind tibiae 

 usually red. 

 j'. Tegmina brief, not nearly reaching the tips of the hind femora; 

 apical margin of subgenitai plate of male greatly elevated. 



25. defectns (p. 177^. 

 j-. Tegmina reaching, generally considerably surpassing, the tijis 

 of the hind femora; apical margin of subgenitai plate of m:ile 



moderately elevated 26. atlanis (p. 178i. 



j3f2. Tegmina extending beyon«l hind femora by the length of the prono- 

 tum or n«'arly as much, often by the length of the head and pronotum 

 combined; prozona of male generally strongly transverse; cerci of male 

 not more than half as long again as broad 27. spretus (p. 184). 



' It is occasionally fissured mesially (perhaps in drying) but not properly notched 

 or bilobed. 



