268 PROCEEDINGS OF THE NATIONAL MUSEUM. 



tumid (female), at and below the ocellus rather narrowly sulcate, deeper 

 in the male than in the female, percurrent, punctate ; eyes rather small, 

 not prominent, longer than the intraocular portion of the geuae; anten- 

 nae ferruginous, growing lutescent toward the base, dusky toward the 

 tip, nearly or quite as long (male) or about two thirds as long (female) 

 as the hind femora. Prouotuui subequal, feebly expanding posteriorly 

 especially in the female, the disk plano-convex, separated by a well- 

 rounded but distinct shoulder from the vertical lateral lobes, brownish 

 fuscous, sometimes fusco-testaceous and then generally punctate with 

 ferruginous, the upper part of the lateral lobes with a broad piceous 

 band crossing the prozona and sometimes continued as a feeble dusky 

 cloud on the inetazona; front border truncate, hind border broadly 

 obtusangulate, the angle rounded; median carina distinct only on the 

 rnetazona and at the front of the prozona, elsewhere obsolete or sub- 

 obsolete; prozoua feebly longitudinal (male) or feebly transverse 

 (female), a very little longer than the minutely rugulose rnetazona. 

 Prosternal spine short, stout, blunt, conical, erect; interspace between 

 inesosternal lobes nearly half as long again as broad (male) or consid- 

 erably transverse but shorter than the lobes (female). Tegmina either 

 abbreviated, being one and a half to two and a half times as long as 

 the pronotum and not nearly reaching the tips of the hind femora, 

 tapering considerably beyond the basal expansion, sublanceolate and 

 bluntly subacumiuate (M.f. curtus)-, or far surpassing the hind femora, 

 broad and subequal, very feebly tapering in the apical half and well 

 rounded at tip (M. f. volaticw, Plate I, fig. c), wholly brownish fuscous 

 or cinereo-fuscous, occasionally maculate to a greater or less degree, but 

 generally slightly in the discoidal area, the anal area sometimes more 

 cinereous than the rest, especially apically; wings in both forms hyaline 

 with a scarcely perceptible yellowish tint, more or less densely but 

 always feebly infumated at the tip, the veins and cross veins of the 

 apical half blackish fuscous. Hind femora relatively longer in the 

 female than in the male, dull luteo-testaceous, black at apex and at 

 extreme base and bifasciate with black or blackish fuscous more or less 

 broadly and obliquely, rarely transversely, the whole often confused 

 and more or less blended on the outer face; beneath pale or dull red- 

 dish; hind tibiae red, usually growing paler toward the base and some- 

 times almost wholly pale greenish luteous, feebly reddening apically, 

 the base generally pale or at least paler, with a small fuscous patellar 

 spot, the spines black except at extreme base, nine to twelve, generally 

 eleven, in number in the outer series. Extremity of male abdomen 

 strongly clavate, well upturned, the supraaual plate long triangular 

 with well rounded acutangulate apex, the apical half depressed to a 

 slightly lower plane, with a broad, equal, deep, median sulcus, bounded 

 by high and sharp walls in a little more than the basal half; furcula 

 consisting of a pair of minute, parallel, distant, tubercular teeth, twice 

 as long as broad, resting outside the ridges of the supraanal plate; 

 cerci simple, straight, and subequal, being contracted a little in the 



