NORTH AMERICAN COLEOPTERA. 201 



basal region, surface coarsely, equally and moderately closely punctate, the inter- 

 vals very finely punctulate. Elytra not wider than the thorax, striate, strise 

 rather closely punctate, the intervals flat, closely sub-biseriately punctate, the 

 punctures nearly as coarse as those of the strise. Prosternum smooth posteriorly, 

 coarsely sparsely punctate in front, the strise abbreviated and parallel. Metas- 

 ternum and abdomen coarsely ana rather densely punctate. Length .12-. 14 inch ; 

 3-3.5 nim. 



A somewhat less robust species than vnlidns, with the basal region of 

 the thorax depressed. The thorax is also different in form and the pros- 

 ternal striae longer. The surface pubescence is much coarser. In some 

 specimens the hind angles of the thorax seem obsoletely carinate, in which 

 case, from the table, it might be mistaken for invisus, which is, however, 

 more robust with finer pubescence, the thorax less coarsely and closely 

 [)unctate. 



Occurs from Canada to Georgia. 



T. iiivisus n. sp. — Form oblong, rather robust, obtuse posteriorly, piceous, 

 moderately shining, pubescence not dense, moderately coarse. Front convex, 

 coarsely not closely punctate, without trace of carinse. Thorax twice as wide as 

 long, arcuately narrowed from the hind angles, these acute moderately prolonged 

 and with a short but distinct carina close to the lateral margin, disc convex, basal 

 region moderately depressed, punctures rather coarse but not close, finer near the 

 base and sides. Elytra not wider than the thorax, striate, strise coarsely jJunctured. 

 intervals flat, biseriately rather coarsely punctate. Prosternal strise abbreviated, 

 the surface between them coarsely sparsely punctate in front. Metasternum at 

 sides and abdomen coarsely, rather closely punctate, the intervals between them 

 alutaceous. Length .14 inch ; 3.5 mm. 



This species is of the same form as vah'dns, but the pubescence is 

 coarser, without being as coarse as in constrictor-. The prosternal stria? 

 are longer than in validus. It is best distinguished by the fine carina 

 of the hind angles of the thorax. 



One specimen, New York, given me by Mr. F. Gr. Schaupp. During 

 a recent visit to the museum at Cambridge a number of specimens were 

 seen in the cabinet of Dr. LeConte, all from the Middle States region, 

 which show some variation in size above and below that given in my 

 description. 



T. constrictor Say. — Form oblong, brownish or piceous, moderately shin- 

 ing, sparsely pubescent. Front coarsely and moderately closely punctate. Thorax 

 nearly twice as wide as long, rather strongly narrowed in front, sides feebly ar- 

 cuate except near the base, disc convex, surface coarsely and rather closely punc- 

 tate, hind angles not carinate. Elytra not wider than the thorax, striate, strise 

 punctate, intervals flat, sparsely biseriately punctate, the punctures finer than 

 those of the strise. Prosternum sparsely punctate, smooth at tip, the strise slightly 

 divergent and not quite entire. Metasternum and abdomen coarsely and moder- 

 ately closely punctate. Length .10-. 12 inch ,• 2.5-3 mm. 



TRANS. AMEK. ENT. SOC. XII. (30) JUXE, 1885 



