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 LatJirobium 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 LatJirohioma, 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-testaceou?, the abdomen darker than the 

 anterior parts; htad as wide as the elytra, parallel at the sides, the 

 angles somewhat narrowly rounded, the punctures raiher strong and 

 sparse; antennae thick, scarcely as long as the head and prothoras, 

 submoniliform, distinctly iucrassate distally, with the outer joints a 

 lit. tie wider than lor;g; protborax carrow and elongate, parallel, dis- 

 tinctly narrower ttian the head aad still more coarsely and strongly 

 punctate, the punctures not very sparse and not seiial; elytra short, 

 scarcely as long as wide, much shorter than the prothorax, at base a 

 little wider than the latter, at apex more obviou>ly widtr, 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. IMale with the third and 

 fourth ventrals narrowly and feebly impres ed along the middle, the 

 fifth more widely and strongly Impressed throughout in median fifth 

 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 0.5 mm. New York (near the city), 

 Massachusetts (Lowell) and Iowa; Michigan, — L-^Contcdebilis 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 many of our 

 larger Lathrobia. 



Tetartopens Czwl. 



We arrive here at a succession of forms, the chief dis- 

 tinguishing character of which is the narrow neck — similar 



