210 AMERICAN COLEOPTEKA 



finely punctulate, tripunctate at middle; median line fine, abbreviated at each 

 end : basal impressions broad, deep; base truncate; sides rounded in front, nearly- 

 parallel and feebly sinuate behind, the margin narrowly reflex ed ; hind angles 

 rectangular, with a short, fine carina. Elytra oblong-oval, nearly one-half wider 

 than the thorax, with the three or four inner striae distinct, the two inner deeper, 

 all but the sutural abbreviated behind ; stripe im punctate, the third with the first 

 dorsal puncture slightly in front of, the second slightly behind, the middle; 

 intervals nearly flat, the two inner feebly convex. Body beneath ferrugineous 

 or rufo-piceous, the last segments of the abdomen sometimes paler. Legs tes- 

 taceous. Length .09-. 11 inch; 2.25-2.75 mm. 



Most nearly allied to tripunctatus Say, but distinct by its more 

 convex form, and by the form of the thorax. The two are often 

 confused in collections. 



It occurs in the Eastern States, extending westward to Iowa. 



17. T. tri|»uiictiitns Say (Plate VI, fig. 4b— Form rather elongate, sub- 

 depressed. Color brown or pieeous, shining, the elytra slightly paler at the sides. 

 Head as wide as the thorax at apex ; eyes large, prominent; antenna? about one- 

 half as long as the body, fuscous, the basal joints paler; palpi testaceous. Pro- 

 thorax subquadrate, about one-half wider than long, slightly wider at base than 

 apex ; apex truncate; anterior transverse impression obsolete, the posterior deep, 

 finely punctate, tripunctate at middle; median line fine, abbreviated at each 

 end; basal impressions distinct; base truncate; sides rounded in front, slightly 

 sinuate behind, the margin narrowly reflexed ; hind angles rectangular, with a 

 short, fine carina. Elytra oblong-ovate, ahout one-half wider than the thorax, 

 with four or five distinct stria?, th'e three inner deep, the first only entire ; stria? 

 impunctate; dorsal punctures distinct, the first slightly in front of, the second 

 slightly behind, the middle; intervals feebly convex. Body beneath reddish 

 brown or pieeous. Legs testaceous. Length .11-. 13 inch ; 2.75 3.25 mm. 



A large and well-marked species, less convex than the others of 

 the group. From vivax, to which it is most nearly related, it may, 

 in addition, be distinguished by its somewhat larger size and more 

 elongate form, with the thorax more narrowed behind. The stride 

 of the elytra are usually more deeply impressed than in the latter 

 species, but this is subject to some variation, the outer two being 

 sometimes nearly effaced. 



Known to me from Canada, New Hampshire, Massachusetts, New 

 York, New Jersey, Pennsylvania, Virginia, Tennessee, Iowa and 

 Texas. 



18. T. obesulus Lee— Form robust. Color varying from ferrugineous to 

 rufo-piceous, shining, the elytra usually with either a subhumeral and a sub- 

 apical spot or the entire margin paler. Head as wide as the thorax at apex; 

 eyes large, prominent; antenna? nearly one-half as long as the body, rufo-testa- 

 ceous, the outer joints somewhat darker ; palpi rufo-testaceous. Prothorax sub- 

 quadrate, rather more than one-half wider than long, wider at base than apex; 



