June i 9 oo.] Casey: On North American Coleoptera. 171 



long as the next two together, eighth globular and perfectly similar to the seventh, 

 the club very strong, parallel, the joints rather closely connected and strongly 

 transverse, the last pointed and but little longer than wide ; prothorax three- 

 fourths wider than long, not more than two-thirds wider than the head, widest 

 near basal third, the sides broadly arcuate, gradually converging anteriorly and 

 almost even, the apex sensibly narrower than the base and broadly arcuate ; basal 

 angles slightly more than right and not at all rounded ; surface rather coarsely 

 and closely punctate ; elytra parallel, obtusely and broadly rounded behind, four- 

 fifths longer than wide, three and a half times as long as the prothorax and nearly 

 a fourth wider, the punctures moderately fine but deeply impressed, somewhat 

 close-set and nearly similar in size to those of the pronotum ; humeri obtusely 

 rectangular, the callus distinct ; scutellum moderate, transverse ; under surface 

 polished, finely, rather sparsely punctured ; legs slender, the four basal joints of 

 the anterior and middle tarsi short, subequal and together but little longer than 

 the last; basal joint of the posterior much shorter than the last. Length 4.5 

 mm.; width 1.65 mm. Alaska and southward elongatus Lee. 



The head has a deep frontal impression at the middle of the line 

 between the antennae apparently in both sexes. 



Pisenus, gen. nov. 

 The species of this genus may be readily distinguished from the 

 preceding by the shorter, more oval form, greater convexity and much 

 smaller size, as well as by the characters of the table ; the prothorax, 

 also, is as wide at base as the base of the elytra, so that the humeri 

 are not exposed at base, and the sides of both form a virtually continu- 

 ous arc. The antennae are nearly similar in structure. The two spe- 

 cies are the following : — 



Body more elongate-oval, shining, clothed sparsely with rather short fine subdecum- 

 bent pubescence, black, the legs and antennae dark testaceous, the basal regions 

 of the elytra, especially at the humeri, suffusedly rufous ; head about as wide as 

 the rectilinearly truncate apex of the prothorax, the antennae stout, fully as long 

 as the head and prothorax, the eighth joint similar to the seventh and the club 

 similar to that of Eupisenus elongatus but narrower ; prothorax three-fourths or 

 more wider than long, the sides almost perfectly even and broadly arcuate from 

 the distinct basal angles to the apex, the latter much narrower than the base ; 

 surface rather finely but strongly, moderately closely punctate ; scutellum trans- 

 verse, broadly angulate behind ; elytra suboval, rather ogivally pointed behind, 

 scarcely at all wider than the prothorax and three times as long, two-thirds longer 

 than wide, the punctures only moderately coarse, impressed, larger than those of 

 the pronotum and somewhat sparse ; under surface finely, rather sparsely punc- 

 tate ; legs moderately slender, rather short, the tarsi short, with the four basal 

 joints of the anterior and intermediate equal among themselves and together 

 about as long as the fifth, the last joint of the posterior very nearly as long as the 

 first three combined. Length 2.8-3. 1 mm.; width 1,3-1.4 mm, Pennsylvania, 

 Indiana and northern Illinois; \Triphyllus ruficornis Lee] humeralis Kirby 



