90 Trans. Acad. Set. of St. Louis. 



third or fourth, the punctures notably coarse, confused and moderately 

 sparse, the median smooth line even; elytra in the male short, barely 

 as long as wide, not wider than the prothorax at base and only slightly 

 wider at apex, the sides diverging noticeably ; in the female much larger* 

 fully as long as wide, nearly as long as the prothorax and much wider, 

 slightly wider at apex than at base, the prothorax relatively narrower 

 in that sex; punctures notably coarse, uneven and moderately sparse; 

 abdomeu not quite as wide as the elytra, minutely and not very closely 

 punctulate. Male with the sixth ventral very narrowly, linearly and 

 distinctly impressed along the middle in posterior two-thirds, the apex 

 rectilinearly truncate, with the median sinus very small, rounded, wider 

 than deep as usual and only about a ninth or tenth as wide as the apex. 

 Length 7.5 mm.; width 1.1 mm. Lake Superior, — LeConte; Wisconsin 



(Bayfield), — Mr. Wickham. [= fauveli Duviv.] simplex Lee. 



Form relatively stouter, polished, black throughout, the legs and antennae 

 dusky testaceous; head as in simplex but relatively larger, the punctures 

 coarse, rather close-set toward the sides, very sparse medially, the an- 

 tennae rather longer than in any of the other species of this group, the 

 medial joints in the male being scarcely less than twice as long as wide, 

 a little shorter in the female; prothorax oblong, scarcely narrowed 

 posteriorly, distinctly longer than wide and subequal in width to the 

 head in both sexes, coarsely, sparsely punctured; elytra similar in the 

 sexes, parallel, distinctly longer than wide, much wider than the pro- 

 thorax and equal in length to the latter, the punctures moderately 

 coarse and rather feeble, sparse; abdomen broad, fully as wide as the 

 elytra, the fine punctures less sparse than usual in this group. Male 

 with the sixth ventral distinctly, linearly impressed along the median 

 line in apical two-thirds, the apex as in simplex, the median sinus 

 still more minute and only about a twelfth as wide as the apex. Length 

 (contracted) 6.5 mm.; width 1.15 mm. Massachusetts (Lowell), — Mr. 

 F. Blanchard gravidulnm n. sp. 



The under surface of tbe first joint of the hind tarsi, in 

 many of the Lathrobia having this joint very short, and espe- 

 cially in Lathrobium and its immediate allies, is obliquely pro- 

 longed beneath the second, slightly expanded and has a flat- 

 tened sole, as though to aid in the use of the tarsus. This 

 sole does not exist on any of the other joints, leading to the 

 presumption that, in motion, this short basal joint may be the 

 only one in contact with the ground, the remainder of the 

 tarsus being elevated or resting on the tips of the claws. 



The species of the armaium group, having peculiarly thick 

 and submoniliform antennae, slightly attenuated at the tip, 

 are difficult to discriminate, and it is possible that a few of 

 the forms here announced may have less than full specific 

 value. Of amplipenne I have a good series of about a dozen 



