March, 1919.] XoTMAX : CoLEOPTERA FROM ONTARIO. 99 



■tured like the thorax. Abdomen densely and finely punctured ; metasternum 

 more sparsely and coarsely. Length 2.4 mm., width 1 mm. (one male). 



Mannerheim's description of clavatum requires elytra widest at 

 the base and thence gradually narrowed to apex. Horn states that 

 the hind tarsi are filiform in inerme Mann, and compressed in cla- 

 vatum Mann., a character not given in the original descriptions. He 

 also states that the hind tarsi are nearly as long as the tibiae in inerme, 

 but shorter in clavatum. In the specimen listed above as clavatum 

 and the one described as elongatum, the hind tarsi are equally long 

 and strongly compressed, but in clavatum they are a third thicker 

 vertically. In clavatum the thorax is scarcely at all narrowed near 

 the base and the elytra are widest at the base, the pubescence finer 

 and the color much paler and more reddish. Inerme Mann, and 

 clavatum Mann, are the species most closely allied to elongatum. 



Lathrobium tenebrosum new species. 



Elongate, rather slender, slightly depressed, parallel, dark and uniform 

 piceous in color throughout, the legs and antennae rufous, surface shining ; 

 head quadrate, as long as wide, sides scarcely arcuate, hind angles rather nar- 

 rowly rounded, base truncate, coarsely and sparsely punctured, more finely 

 and closely behind, gular sutures moderately separated and converging poste- 

 riorly about one third ; antennae rather short and stout ; second and third 

 joints one half longer than wide, four to ten subequal as wide as long, much 

 rounded, last joint as long as the second, acute at apex. Xeck one half the 

 width of the head : prothorax one third longer than wide, scarcely wider than 

 the head, very slightly narrowed behind, sides feebly arcuate, angles somewhat 

 rounded, punctures coarse and deep, median smooth line rather narrow and 

 entire : elytra scarcely longer than the prothorax on the lateral margin and 

 scarcely wider at the apex, conjointly rather deeply emarginate. sides diverg- 

 ing very slightly posteriorly and nearly straight, punctures coarse and indis- 

 tinct, surface subrngose ; abdomen slightly wider to the fourth segment thence 

 more strongly narrowed to the apex, punctures minute, dense and subasperate 

 ( one fema 



Male. — Unknown. 



Female. — The sixth segment strongly lobed, lobe as long as the segment 

 and at the apex two fifths as wide as the segment, sides strongly converging 

 posteriorly and tip very obtusely rounded ; fifth segment at middle on poste- 

 rior margin and lobe at middle just visibly flattened. Length 6.5 mm., width 

 1 mm. 



Close to piccscens Csy.. but differing slightly in the proportions 

 of the thorax and elytra and in the form of the sixth segment in the 

 female. 



