OPHE^A. 493 



parallel, with the sides of the thorax more rounded. In some instances, again, forms 

 occur which seem to be intermediate between this genus and Schematiza, so that their 

 proper place must remain at present a matter of doubt. Moreover the variation in the 

 shape of the antennae and thorax of several species may lead to further subdivision ; 

 but at present I provisionally include these in Ophrcea, which may in all cases be 

 recognized by the nearly impubescent and rugose elytra. 



a. Species of posteriorly dilated shape, the thorax transverse and angulate at 



the sides. 



1. OphraBa subcostata. (Tab. xxvill. fig. 5.) 



Ovate, convex, somewhat dilated, black ; thorax fulvous, with a black central band, its surface rugose, the 

 posterior angles moderately sinuate; elytra rugose-punctate, black, each with two or three obtusely raised 

 longitudinal costse. 



Length 3-3 1 lines. 



Hob. Mexico, Capulalpam {Salle) ; Guatemala, Purula (Champion). 



There are sufficient differences to be found between this species and 0. rugosa to 

 justify their separation. 0. subcostata is of a more convex, posteriorly dilated shape, 

 and therefore less parallel ; the antennse in the male are rather longer, the third and 

 fourth joints being much more elongate than in 0. rugosa ; the thorax is angulate only 

 below the middle (instead of having another intermediate angle) and its posterior 

 margin is straighter and but slightly sinuate or emarginate at the sides, besides having 

 a straight black band on the centre of the disc from the base to the apex ; the elytra 

 have the same kind of longitudinal depressions as are visible in the allied species, but 

 the interstices preceding them are more distinctly raised and plainly visible to the 

 naked eye ; the female has the sides of the last abdominal segment spotted with testa- 

 ceous, as in 0. rugosa. The single specimen from Mexico before me is rather smaller 

 than, though agreeing in other respects with, those from Guatemala ; the latter all 

 show the above-mentioned differences. 



2. Ophrsea rugosa. (Tab. XXVIII. fig. 6.) 



Elongate, nearly parallel, black ; thorax rufous or flavous, coarsely rugose, the posterior angles deeply sinuate ; 

 elytra finely rugose, with two or three obsolete longitudinal depressions. 



Length 4 lines. 



Head closely rugose-punctate ; eyes small, entire ; antennse not extending to half the length of the body, the 

 second joint short, the fourth one half longer than the third, the following joints flattened and shorter; 

 thorax twice as broad as long, or somewhat broader, the lateral margins more or less distinctly angulate 

 immediately before and below the middle, the posterior angles deeply sinuate and obliquely shaped, the 

 posterior margin straight at the middle, the surface strongly and irregularly rugose, obsoletely depressed 

 at the sides and at the middle ; scutellum broad, its apex broadly rounded ; elytra much more finely 

 rugose than the thorax, with several obsolete, longitudinal depressions, the one near the lateral margin 

 more distinct and bounded inwardly by a broadly rounded ridge commencing at the shoulder but abbre- 



