132 PROCEEDINGS OF THE NATIONAL MUSEUM. 



num of male in_ front of lobes with a central swelling, forming a blunt 



tubercle (5. Utahensis series). 



h l . Apical margin of subgenital plate of male entire; l lobes of fur- 

 cula not exceptionally broad; subgenital plate greatly but not excess- 

 ively prolonged 



1 1 . Interval between mesosternal lobes of male more than twice as 

 long as broad; of female a little longer than broad; male cerci more 

 than twice as long as broad; apical margin of subgenital plate of 

 male, as seen from behind, subtruncate 18. Iruneri (p. 164). 



1 2 . Interval between mesosternal 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 subgenital plate of male, as seen 

 from behind, rounded 19. excelsns (p. 166). 



h*. Apical margin of subgenital plate of male deeply notched 011 either 

 side of the middle; lobes of furcula exceptionally broad, subequal 

 throughout; subgenital plate excessively prolonged. 



20. utahensis (p. 167). 



/ 2 . Apical margin of subgenital plate of male mesially notched; rnesoster- 

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

 tubercle (6. Spretus series). 



g l . Tegmina extending beyond hind femora, if at all, -by not more than 

 the length of the pronotum, generally by much less than that; prozona 

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

 almost or quite twice as long as broad. 



h l . Cerci of male regularly subfalciform, both margins being uni- 

 formly and distinctly curved rather than bent, and more than twice 



as long as median breadth 21. alaskantts (p. 169). 



ft 2 . Cerci of male nearly straight as viewed laterally, or slightly bent 

 upward in apical half, rather than curved. 



i 1 . Cerci of male distinctly more than twice as long as median 

 breadth, the apical half subequal but narrower than the basal half. 

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



fc 1 . Larger, robust; median carina usually as distinct between 

 the sulci as on the anterior portion of the prozona. 



22. affinis (p. 171). 



fc 3 . Smaller, slender; median carina usually obsolete or sub- 

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



j 2 . Hind tibiae bright red 24. bilitumtits (p. 17-1). 



1 3 . Cerci of male not more than twice as long as median breadth, 

 the apical half not only narrower than the basal half, but itself 

 tapering throughout, obliquely truncate beneath; hind tibiae 

 usually red. 



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

 apical margin of subgenital plate of male greatly elevated. 



25. defect tt s (p. 177). 



j 2 . Tegmina reaching, generally considerably surpassing, the tips 

 of the hind femora; apical margin of subgenital plate of maJe 



moderately elevated 26. atJanis (p. 178). 



</ 2 . Tegmina extending beyond hind femora by the length of the prono- 

 tum or nearly as much, often by the length of the head and pronotum 

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

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



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

 or bilobed. 



