90 Trans. Acad. Sct. 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; 
abdomen 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 1.1mm. Lake Superior,— LeConte; Wisconsin 
(Bayfield), — Mr. Wickham... [= fauveli Duviv.].........- simplex Lec. 
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- 
teunae 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 abouta twelfth as wide as the apex. Length 
(contracted) 6.5 mm.; width 1.15 mm. Massachusetts (Lowell),— Mr. 
Bi BiRMOHANA Ss on ss Seba coed eva oavesy deh pune ee bees -gravidulum n.- sp. 
The under surface of the 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 armatum 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 
