352 MEMOIRS ON THE COLEOPTERA 



bistriate as in the latter. The incised line behind the apical mar- 

 gin is generally well developed, but in the species with narrow 

 thoracic base it becomes wholly obsolete medially, this diversi- 

 fication also being somewhat as in Anaferonia. The prosternum 

 is impressed along the middle, the sulcus becoming very feeble in 

 some species; this is not an important character from a generic 

 viewpoint. In the male the entire upper surface is frequently 

 highly polished, but in the female the elytra are apt to be more 

 opaque; in gravida the lustre is similar in the two sexes. The scu- 

 tellar stria varies from long and distinct to virtually obsolete. 



The species known to me are as follows, the description of heros 

 Say, being taken from the original: 



Body stouter, less convex; thoracic base as wide as the apex or wider, 

 the apical incised line always distinct and entire; scutellar stria 

 usually evident, sometimes long, rarely wanting; prosternum sul- 

 cate 2 



Body less stout and more convex, the thoracic base much narrower than 

 the apex, the apical incised line completely wanting, except toward 

 the sides; scutellar stria wanting or vestigial; prosternum less im- 

 pressed 7 



2 Body notably large in size, black and glabrous; mandibles much and 

 deeply striated; thorax large, convex, rather abruptly contracted 

 at the basal margin; dorsal and anterior and basal lines distinct; 

 basal margin depressed near the angles, rugose; an elevated line on 

 the basal margin, near to and parallel with the lateral edge; basal 

 angles rectangular; elytra very slightly striated; striae acute, punc- 

 tured, the punctures obsolete toward the tip; interstitial lines flat; 

 beneath black. Length rather more than nine-tenths of an inch 

 [say 23 mm.]. The Arkansas. [Feronia heros Say] heros Say 



Body evidently not so large in size 3 



3 Scutellar stria fine, short, punctate, entirely discal, not approaching 

 the first stria, which continues unbroken to the base. Body oblong- 

 oval, stout, feebly convex, deep black and shining, the elytra alu- 

 taceous in the female; legs black; head slightly more than half as 

 wide as the prothorax, the eyes moderately prominent; sulci coarse, 

 long and deep, extending also through about basal half of the epi- 

 stoma; antennae black, with the vestiture pale gray, extending almost 

 to the thoracic base; mandibles striate throughout; prothorax fully 

 one-half wider than long; base slightly wider than the apex, which is 

 sinuate, broadly margined, the margination flat, delimited by an 

 incised line, the angles not deflexed as in Megasteropus but as in all 

 the following species; sides broadly rounded, coarsely reflexed, the 

 edge thick, gradually converging toward the very moderate stric- 

 ture and thence straight and just visibly diverging to the right angles; 

 surface with feeble ruguliform lines; anterior impression obsolete, 

 the posterior distinct, subangulate, the stria coarse, almost attain- 



