130 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL.XX. 



h 2 . Lobes of furcula broader than long; extremity of subgenital plate 

 of male elevated and considerably recurved ; interval between rneso- 

 sternal lobes of male nearly or quite twice as long as broad. 



105. texanua (p. 324). 



e*. Subgenital plate of male distinctly narrower than long, often narrowing 

 apically (24. Plebejus series). 



f l . Hind margin of pronotum distinctly though obtusely angulate; inter- 

 val between mesosternal lobes of female at least half as long again a> 

 broad; apical portion of anal cerci of male distinctly and sharply snlcaie 



exteriorly 106. plebejus (p. 326). 



/ 2 . Hind margin of pronotum rarely angulate, sometimes emarginate : 

 interval between mesosternal lobes of female (where known) subquadrate; 

 apical portion of anal cerci of male exteriorly tumid or plane. 

 g l . Posterior margin of pronotum distinctly emarginate in the middle; 

 tegmina widely separated; cerci of male elongate, surpassing the supra- 

 anal plate; subgenital plate broader at base than apically, its apical 



margin regularly rounded and even 107. gracilis (p. 327). 



g*. Posterior margin of prouotum obtusely angulated or ronnde I trun- 

 cate, with at most but feeblest sign of any emargination ; tegmina attiu- 

 geut or overlapping; cerci of male relatively brief, not surpassing the 

 supraanal plate; subgeuital plate not broader at base than apically, its 

 apical margin angulate or tuberculate. 



/i 1 . Tegmina shorter than prouotum; posterior margin of prouotum 

 rounded truncate with feeblest signs of mesial emargination; cerei of 

 male curved slightly upward; subgeuital plate ending in a blunt 



rather coarse tubercle 108. inops ( p. 329 ) 



h". Tegmina longer than pronotum: posterior margin of pronotum 

 distinctly though very obtusely nngulate; cerci of male curved feebly 

 downward; subgenital plate ending in a delicate pointed tubercle. 



109. marginatns (p. 330;. 



A' 2 . Tegmina nearly or quite as long as, or longer than, the abdomen ; furcula usually 

 well developed, generally at least a quarter as long as the supraanal plate, but some- 

 times obsolete. 



& 1 . Cerci of male rapidly expanding from the base toward the middle, as a whole 

 broad ?md short, flabellate, rarely twice as long as broad, not expanded apieallv 

 (2. Flabellifer series). 

 c 1 . Cerci of male twice as broad in broadest as in narrowest portion. 



d l . Subgenital plate of male with a distinct though minute independent ! apica! 



tubercle 4. occldentaUs (p. 145). 



d-. Subgenital plate* of male with only an obscure trace of apical tubercle. 



5. cuncatus (p. 147). 



c 2 . Cerci of male with no striking inequality in breadth.. 6. flctbeU-ifcr (p. 148). 

 &-. Cerci of male tapering from the very base toward the middle, rarely equal in 

 basal portion/- generally long and slender and rarely as little as twice as long as 

 broad. 



c 1 . Cerci of male beyond the middle either equal or tapering, the tip usually 

 slender or acuminate, never bifurcate (in M. aler it enlarges feebly). 

 d l . Furcula of male developed as large llattened lobes, about half as long as 

 the supraanal plate and exceptionally broad, but apically narrowed by the 

 considerable excision of their inner side ; subgeuital plate not elevated apieallv 

 above the lateral margins (3. Bowditchi series). 



1 That is, not formed by the culmination of the more or less pyramidal form of the 

 s.ubgeuital plate. 



- In rare instances it expands slightly from the extreme base, but it is then greatly 

 expanded apically. 



