Casey — A Revision of the American Paederini. 97 



punctures fine and sparse ; abdomen nearly as wide as the elytra. Male 

 with the secondary sexual characters as in confusa, except that the 

 apex of the sixth ventral is much more broadly and feebly rounded, 

 with the triangular notch smaller, being about a third as wide as the 

 apex and but little wider than deep. Length 5.6 mm.; width 0.9 mm. 

 New York (near the city) and District of Columbia snspecta n. sp. 



The three distinct groups of species in the above table are 

 represented by concolor, cruralis and confusa, the first two, 

 composed of larger species, having the elytra large, the last, 

 with the elytra small, being composed of a considerable num- 

 ber of much smaller species. The fact stated of certain 

 species of Lafhrobium, that the female is smaller and more 

 slender than the male, is still more obvious in this genus, being 

 strikingly apparent in cruralis and confusa. 



Liathrobiopsis n. gen. 



We begin in this genus a series of groups, well distin- 

 guished from those which precede by the longer basal joint 

 of the hind tarsi, this being as long as the second in the 

 present genus and both slightly elongate. In addition to 

 this, the first joint is similar to the second beneath and not 

 swollen into a flattened sole. Lathrobiopsis differs very 

 greatly from Lathrobioma, which has more the facies of 

 Latlirobium, in its depressed form and small prothorax, with 

 the median smooth line partially delimited by impressed series 

 of punctures, large flattened elytra, with regular series of 

 punctures and in other characters as shown in the table ; our 

 single representative at present is the following : — 



Body slender, distinctly depressed, dark testaceous, the head dusky, the 

 abdomen piceous-black; legs pale flavo-testaceous, the antennae dusky 

 rufous; head quadrate, the sides long, parallel and nearly straight, the 

 basal angles very distinctly right and but very slightly rounded ; punc- 

 tures rather coarse, deep, moderately sparse, a small vertexal space 

 impunctate; antennae stout, longer than the head and prothorax, the 

 medial joints one-half longer than wide, inflated and rounded at the 

 sides and pedunculate at base; prothorax very slightly narrower 

 than the head, not longer than wide, the sides evidently converging 

 from apex to base and nearly straight, the apical angles distinct and 

 not rounded, the punctures not quite as coarse as those of the head, 

 confused and moderately sparse except along the broad impunctate 



