86 Trans. Acad. Sci. of St. Louis. 



distance to the base, then broadly rounded to the neck; prothorax 

 slightly elongate, wider than the head, the sides parallel and scarcely 

 arcuate; elytra scarcely as long as wide, distinctly wider than the pro- 

 thorax at base and apex; abdomen as wide as the elytra. Male un- 

 known; female with the sixth ventral strongly and rather narrowly 

 lobed at tip, the lobe evenly and stronsly rounded at apex, with its sur- 

 face rather strongly convex aod not at all impressed. Length 7.0 mm. ; 



width 1 . 1 mm. British Columbia yancouveri n. sp. 



Body smaller, parallel, moderately stout, shining, piceous-black in color, 

 the legs and antennae pale rufous, sculptured nearly as in vancouveri, 

 the punctures anteriorly fully as small and still sparser, those of the 

 abdomen tven denser; head notably elongate and oval, the sides par- 

 allel and broadly arcuate, rounding more strongly at base to the neck; 

 prothorax distinctly wider than the head, oblong, parallel, slightly 

 elongate; elytra distinctly longer than wide, a little wider than the pro- 

 thorax throughout and only very slightly shorter; abdomen parallel, as 

 wide as the elytra. Male unknown; female with the sixth ventral 

 nearly a« in vancouveri. Length 5.7 mm. ; width 0.9 ram. Illinois. 



illini n. sp. 



14 — Species of the simile type, parallel or subparallel, rather large in size, 



the antennae moderate in length and frequently stout, the elytral 

 punctures more or less tine, sparse and inconspicuous, the male ventral 

 characters conspicuous, the fifth and sixth segments more or less 

 strongly impressed, the latter also with a large distinct apical emargi- 



nation ... 15 



Species of the simplex type, parallel, the antennae but little less stout and 

 rather more elongate than in the preceding, rather large; ventral charac- 

 ters of the male inconspicuous, consisting of a very minute nick at the 

 middle of the apex of the truncate sixth segment and generally a very 

 fine linear impresrsion of the disk; elytral punctures generally coarse, 

 strong and conspicuous, the legs relatively more slender than usual.. 20 



15 — Elytra as long as the prothorax 16 



Elytra always shorter than the prothorax in both sexes 17 



16 — Form stout, black, the elytra slightly piceous, the legs and antennae 



duky testaceous, shining; head small, the sides parallel and straight 

 or very feebly arcuate for a long distance behind the eyes, the angles 

 broadly rounded; punctures not very coarse and extremely sparse, a 

 little less so at the sides; antennae thick, the medial joints strongly 

 obconic and less than one-half longer tban wide; neck a little more 

 than half as wide as the head; gular sutures widely separated, almost 

 straight and parallel; prothorax large, but litt'e longer than wide, dis- 

 tinctly wider than the head and correspondingly narrower than the 

 elytra, gradually feebly narrowed behind from apex to base; punctures 

 sparse, very much coarser than those of the head ; elytra exactly quad- 

 rate, parallel, equal in length to tlie prothorax, finely, sparsely and in- 

 conspicuously punctate; abdomen not quite as wide as the elytra, 

 minutely and very densely punctulate, dull in lustre. Male unknown; 

 female with the sixth ventral very broadly, obtusely lobed at apex, the 

 surface strongly convex, wholly unimpressed. Length 7.0 mm.; width 

 1.2 mm. Massachusetts, — Mr. Blanchard — and Canada. 



obtusnm n. sp. (Fvl. MS.) 



