340 CASEY 



Emmenastrichus Horn. 

 In this genus the body is oblong, parallel, moderately con- 

 vex, coarsely sculptured and pubescent, with the head very 

 short and broad, the frontal margin even and concealing most 

 of the mouth parts from above, the mandibles being small, 

 stout, rapidly narrowed and deflexed toward tip, with the apex 

 very feebl}^ bifid. The left mandible is broadly ridged exter- 

 nally above, but not evidently toothed, and the right has a very 

 large pointed porrect dorsal tooth, which does not seem to clasp 

 the labrum, although the latter is very strongly retractile. The 

 mentum is moderately transverse, biobliquely rectilinear at apex, 

 with an unusually broad and feebly rounded apical sinus, rather 

 more than a third as wide as the maximum width of the mentum. 

 The eyes are moderate in size and in prominence. The tarsi 

 are rather stout, the posterior much shorter than the tibice, with 

 the basal joint slightly shorter, as well as decidedly thicker, 

 than the fourth. The wings are probably aborted, at least to 

 some extent, the metasternum being evidently shorter than the 

 first ventral, notwithstanding the elongate form of the body. 

 The rather long curved hairs of the upper surface are borne 

 only by the interstitial punctures, the coarse serial punctures 

 bearing each from its anterior margin merely an infinitesimal 

 seta, only visible under high power. The type of the genus is 

 the following : — 



Oblong, parallel, rather shining, brownish-black above, black beneath, 

 with the legs rufous ; head very broadly, rectilinearly truncate, 

 the sides nearly as prominent as the eyes, short, joining the apex 

 through a strong even arcuation and becoming parallel toward the 

 eyes, the punctures coarse, deep, simple, circular and somewhat 

 separated ; prothorax parallel, sparsely pubescent, scarcely three- 

 fourths wider than long, the sides evenly and moderately arcuate, 

 the broadly sinuate apex but very little narrower than the base, 

 the side margins rather strongly reflexed ; punctures coarse, deep, 

 slightly separated, becoming still coarser and subcoalescent near 

 the sides, the basal margin transverse, extremely feebly and 

 broadly lobed toward the middle ; scutellum moderate ; elytra 

 three-fifths longer than wnde, barely three times as long as the 

 prothorax and scarcely as wide, gradually acutely ogival at tip, 

 the sides parallel and very feebly arcuate ; punctures very coarse, 

 perforate, simple, moderately close-set in series which become 

 impressed toward tip, the intervals with two uneven series of fine 



