136 PROCEEDINGS OF THE NATIONAL MrSEW. VOL xx. 



/ 2 . Subgenital plate of male very broad apically, nearly or quite as broad 

 as long, apically generally notched, thongb very feebly ; furcula rarely 

 (and then but little) more than a third the length of the supraanal plate; 

 hind tibiae usually red, but sometimes blue or green (21. Angustipennis 

 series). 

 #' . Hind tibiae red. 



ft 1 . Prozona of male subquadrate; tegmina very slender, subequal, 

 scarcely expanded on the costa; furcula of male with straight sub- 

 parallel forks 92. comptus (p. 302). 



h-. Prozona of male distinctly longitudinal, much longer than its basal 

 breadth ; tegmina of ordinary breadth and costal expansion, tapering; 

 furcula of male with arcuate, strongly divergent forks. 



93. coccineipes (p. 303). 

 <jr 2 . Hind tibiae glaucous. 



h l . Furcula of male not more than a third as loiig as the supraaual 

 plate; tegmina lightly maculate or immaculate. 



94. angustipennis (p. 305). 

 ft 2 . Furcula of male more than a third as long as the supraaual plate; 



tegmina usually heavily maculate 95. impiger (p. 306) . 



e 2 . Furcula of male slight, the projecting portion not longer or s ircely 

 longer than the last dorsal segment from which it springs. 

 f 1 . Subgenital plate of male broad, throughout broader than the extreme 

 base of the cerci ; apical portion of supraaual plate suddenly depressed 

 just beyond the middle; cerci moderately broad, not much narrowed in 

 the middle, more or less suddenly bent inward near tip, exteriorly sulcate 

 at apex (22. Packardii series). 



g 1 . Interval between mesosternal lobes of male nearly or quite twice as 

 long as broad. 



A 1 . Median carina of pronotum obsolete or almost obsolete on the pro- 

 zoua, distinct but low on the metazona; extremity of male cerci 

 nearly plane exteriorly or merely depressed within the margin ; forks 

 of furcula conspicuously divergent. 



1 1 . Prozona ordinarily with a broad median dark stripe, made more 

 conspicuous by the much lighter colors on either side, or else light- 

 brownish testaceous; antennae of male but little more than three- 

 fourths as long as the hind femora; hind tibiae blue or red. 



90. packardii (p. 309). 



1 2 . Prozona with uniform dingy coloring on disk ; antennae of male 

 almost aslong as the hind femora ; hind tibiae red. 97. foedus (p. 311 ). 



ft 2 . Median carina of pronotum tolerably distinct on the prozona, at 

 least anteriorly, distinct and moderately high on the metazona; 

 extremity of male cerci deeply sulcate exteriorly or else tumid; forks 

 of furcula parallel or only slightly divergent. 



1 1 . Larger species; narrowest part of interval between mesosternal 

 lobes of male narrower than the narrowest part of frontal costa; 

 sides of head and prozona rarely with any black band ; interval 

 between mesosterual lobes of female strongly transverse; hind fem- 

 ora red beneath ; hind tibiae stout 98. corpulent us (p. 313). 



1 2 . Smaller species; narrowest part of interval between mesosternal 

 lobes of male equal to the narrowest part of frontal costa; sides of 

 head and prozona with a black baud; interval between mesosterual 

 lobes of female subquadrate; hind femora yellow beneath; hind 

 tibiae slender 99. conspersus (p. 315). 



# 2 . Interval between mesosterual lobes of male subquadrate. 



100. compact u s (p. 316). 



