294 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL.XX. 



tumid, slightly elevated above the pronotum, the interspace between 

 the eyes not broad, but much broader than the first autennal joint^ 

 fastigium very steeply declivent, deeply sulcate throughout; frontal 

 costa failing to reach the clypeus, slightly contracted above, elsewhere 

 fully as broad as, if not broader than, the interspace between the eyes r 

 sulcate at and below the ocellus, biseriately punctate above; antennae 

 luteo-ferruginous, nowhere infuscated, except sometimes at extreme 

 tip, about three-fourths as long as the hind femora. Pronotum sub- 

 equal, scarcely expanding on the metazona, the lateral lobes with & 

 somewhat obscure, piceous band, crossing the prozona above; disk 

 feebly convex, passing by a rounded shoulder, becoming almost a 

 lateral cariua on the metazona, into the tumid, vertical, lateral lobes ;. 

 median carina distinct on the metazona, feeble and blunt on the pro- 

 zona; front margin feebly convex, hind margin almost rectangulate; 

 prozona quadrate or feebly longitudinal, scarcely or slightly longer 

 than the densely punctate metazona. Prosternal spine rather long, 

 erect, cylindrical, rather blunt ; interspace between inesosternal lobes 

 about half as long again as broad. Teginina surpassing the hind femora, 

 rather slender, gently tapering, well rounded apically, brownish fuscous, 

 with very slight, obscure signs of sparse maculation in the discoidal 

 area; wings hyaline, with the anterior and apical veins testaceous. 

 Hind femora ferruginous or luteo-ferruginous, sometimes with an oliva- 

 ceous tinge, bifasciate above with blackish fuscous, generally obscurely, 

 and with a basal spot of the same, the under surface luteous or ferru- 

 ginous, the genicular arc black; hind tibiae pale glaucous green, a little 

 pallid at the base, with an obscure, fuscous, post-basal anntilus, the 

 spines black beyond their pallid base, eleven in number in the outer 

 series. Extremity of male abdomen clavate, somewhat upturned, the 

 supraanal plate and furcula as in M. bispinosus; cerci also shaped as 

 there, but smaller and slenderer, fully six times as long as the narrow- 

 est breadth; subgenital plate narrowing regularly from base to apex, 

 much longer than broad, subconical, the apical margin with a hardly 

 perceptible elevation, entire, as viewed from above acutangulate, the 

 angle blunt and a little thickened. 



Length of body, male, 21 mm.; antennae, 9 mm.; tegmiua, 17.5 mm.; 

 hind femora, 12.25 mm. 



Five males. Gulf coast of Texas, Aaron; Garrizo Springs, Dimmit 

 County, Texas, Wadgymar, November (L. Bruner). 



This species is exceedingly close to M. Mspinosus, but is smaller, 

 darker, a more southern form, and differs by its slightly smaller and 

 slenderer cerci, the general characters of the subgenital plate and in 

 minor peculiarities of its structure. It can be confounded with iio> 

 other species. 



