104 Trans. Acad. Sci. of St. Louis. 
angulate notch of the labrum, dividing the latter into two 
quadrate lobes and the less strongly dilated anterior tarsi. It 
differs from Lathrobium and allied genera, also in the form 
of the hind tarsi, which have the four basal joints small and 
subequal. It is represented at present by a single very small 
species, having the general facies of Lathrobioma, and of 
wide distribution, which may be readily recognized by the 
following characters : — 
Parallel, slender, convex, shining, dark piceous or blackish in color, the 
legs and antennae fusco-testaceous, the abdomen darker than the 
anterior parts; head as wide as the elytra, parallel at the sides, the 
angles somewhat narrowly rounded, the punctures rather strong and 
sparse; antennae thick, scarcely as long as the head and prothorax, 
submoniliform, distinctly incrassate distally, with the outer joints a 
little wider than long; prothorax narrow and elongate, parallel, dis- 
tinctly narrower than the head and still more coarsely and strongly 
punctate, the punctures not very sparse and not serial; elytra short, 
scarcely as long as wide, much shorter than the prothorax, at base a 
little wider than the Jatter, at apex more obviously wider, the sides-di- 
verging from the base; punctures smaller, sparse and rather confused; 
abdomen at base as wide as the elytra, slightly wider behind, finely, not 
densely punctate; legs moderately stout. Male with the third and 
fourth ventrals narrowly and feebly impressed along the middle, the 
fifth more widely and strongly impressed throughout in median fifih 
or sixth, the apex broadly sinuato-truncate, the sixth not obviously im- 
pressed, though broadly, indefinitely so toward base, but with a large dis- 
cal patch of short black spicular hairs at each side of the median line, 
the apex broadly subtruncate, with a gradually formed, broadly rounded, 
shallow median sinus, about a third as wide as the segment and five 
times as wide as deep; female somewhat stouter than the male, the sixth 
ventral with a broad feeble and broadly rounded lobe at tip, unim- 
pressed. Length 3.3 mm.; width 0.6mm. New York (near the city), 
Massachusetts (Lowell) and Iowa; Michigan, — LeConte..debilis Lec. 
The type is one of the smallest known species of the 
Lathrobia; it does not seem to be rare and varies considera- 
bly in shade of color, possibly due to immaturity. It will be 
noticed that the female is stouter than the male—and not 
more slender, as is evidently the case with sot of our 
larger Lathrobia. 
Tetartopeus Czwl. 
We arrive here at a succession of forms, the chief dis- 
tinguishing character of which is the narrow neck— similar 
