134 PROCEEDINGS OF THE NATIONAL MUSEl'M. VOL.XX. 



ft 1 . Supraanal plate regularly triangular with straight margins; sub- 

 geiiital plate with a postmarginal tubercle at apex (8. Impudicus 



series) 36. impudicus (p. 204). 



ft 2 . Supraanal plate with sides more or less irregular or sinuate by 

 lateral compression or by the depression of the apical half of the 

 plate; subgenital plate with no postmarginal tubercle though some- 

 times with the margin itself apically thickened. 



1 1 . Interval between mesosternal lobes of male distinctly longer, 

 generally much longer, th:tn broad and much narrower than the 

 lobes; metastemal lobes attingent or subattingent in the male (12. 

 Dawsoni series). 



f. Subgenital plate of male broad, at least as broad as long; 

 cerci incurved feebly and gently or not at. all ; hind tibiae red. 



50. dau-soni (p. 227). 



j' 2 . Subgenital plate of male rather narrow, narrower than long, 

 although short; cerci abruptly incurved apically; hind tibiae 

 yellow. 



k ] . Tegmina only attaining the tip of the hind femora; supra- 

 anal plate of male suddenly depressed in apical half; furcula 

 . slightly developed, shorter than last dorsal segment. 



51. fjlaclstoni (p. 229). 



k : . Tegmina considerably surpassing the tip of the hind femora; 

 supraanal plate of male not apically depressed; furcula well 

 developed, about one-third as long as the supraanal plate. 



52. palmeri (p, 230). 



1 2 . Interval between mesosternal lobes of male quadrate, almost or 

 a little transverse and but little narrower than the lobes; meta- 

 stemal lobes of male only approximate (17. Fasciatus series). 



J 1 . Cerci no slenderer or hardly slenderer on apical than on basal 

 half, far surpassing the supraanal plate; furcula very slight, not 



so long as last dorsal segment 77. fasciatus (p. 267). 



j 2 . Cerci much slenderer on apical than on basal half, shorter than 

 the supraanal plate; furcula long and slender, reaching the mid- 

 dle of the supraanal plate 78. boreal! 8 (p. 270). 



/ 2 . Subgenital plate of male conspicuously narrower at apex than at base 

 (generally only half as wide), rarely at all elevated at apex above the lateral 

 margins and never notched ' : cerci always distinctly narrowing on basal 

 half, the upper angle of the apex prolonged and often subacumiuate (19. 

 Femur-rubrum series). 



(f. Distal half of male cerci much less than half as broad as the extreme 

 base; interval between mesosterual lobes of male nearly or quite twice 

 as long as broad ; tegmina usually surpassing the hind femora. 



h l . Pronotum marked above with light carmal streaks on a dark 



ground ; tegmiua dark olivaceous green 81. plitmbetM (p. 276). 



ft-. Pronotura uniform in coloring above; tegmina dark fuscous. 



1 1 . Furcula not reaching or scarcely reaching the middle of the 

 supraanal plate 82. femur-mbrum (p. 278). 



1 2 . Furcula extending considerably beyond the middle of the supra- 

 anal plate 83. propinquus (p. 285;. 



g~. Distal half of male cerci distinctly more than half as broad as the 

 extreme base; interval between mesosterual lobes of male scarcely if at 

 all longer than broad; tegmina usually falling far short of the tips of 

 the hind femora. 



1 Except in M. monticola, where it is very broadly and shallowly notched by the 

 tubercular elevation of the lateral extremities of the apical margin. 



