326 Trans, Acad. Set. of St. Louis. 



the tip rapidly iacrassate, tlie subapical joints transverse, the eleventh 

 as long as the preceding three combined, the bristling setae throughout 

 distinct; prothorax a fourth wider than the head and a third wider 

 than long, parallel and feebly arcuate at the sides, slightly andarcuately 

 narrowed at the apex, the basal angles rounded, the surface convex, 

 wholly unimpressed; elytra transverse, three-fifths wider but only 

 slightly longer than the prothorax, the humeri distinctly exposed at 

 base; abdomen broad, fully as wide as the elytra, the sides arcuate, 

 narrowed rather conspicuously toward tip; legs slender, moderately 

 long. Length 1.65 mm. ; width 0.68 mm. Mississippi (Vicksburg). 



laevis n. sp. 

 The type is probably a female, or at least there are no 

 evident male sexual characters visible externally. 



Trichinsa Csy. 



A considerable number of new forms have recently come to 

 light and the known species may be provisionally classified as 

 follows : — 



Elytra composltely sculptured, having coarser nude punctures intermingled 

 with smaller asperulate punctules bearing the conspicuous pubescence, 

 the interstices polished, not or oaly very feebly and coarsely reticulate; 

 antennae very stout distally, the second and third joints elongate and 

 frequently subequal 2 



Elytra with a single set of minute and obsoletely asperulate punctures bear- 

 ing the pubescence, the interstices less shining and distinctly mlcro- 

 reticulute; species smaller in size; basal angles of the prothorax always 

 somewhat obtuse and rounded, never prominent 6 



2 — Hind angles of the prothorax distinct, usually somewhat prominent and 

 not at all rounded ; body larger and stout 8 



Hind angles obtuse and very narrowly rounded; nude punctures of the elytra 

 smaller and but little larger than the pubiferous punctures; body less 

 stout 5 



S — Elytra black and concolorous with the head and prothorax. Body stout, 

 polished, minutely and feebly mlcro-retlculate, except the elytra, which 

 are non-reticulate and with the coarse punctures sparse; pubi- 

 ferous punctures throughout minute and sparse, the pubescence long, 

 shaggy and erect but not very close; legs pale; head wider than long, 

 scarcely impressed, the eyes small, prominent; antennae very stout 

 distally, sparsely pubescent and with long bristling setae, extending to 

 the middle of the elytra, dusky but gradually rufous in basal half, the 

 subapical joints moderately transverse, the eleventh obtusely pointed, 

 longer than the two preceding combined, the second and third elongate, 

 the former very slightly the longer; prothorax much wider than the 

 head, fully one-half wider than long, widest near apical third, where 

 the sides are broadly and feebly rounded, thence very slightly converg- 

 ing to the basal angles, which are not rounded but not prominent; sur- 



