Casey — A Revision of the American Paederini. 115 



flattened along the middle throughout, the apex truncate ; sixth unim- 

 pressed, the apex broadly sinuato-truncate, with a smallj broadly trian- 

 gular tooth projectiDg from the middle; female as large as the male but 

 rather less stout, the sixth ventral with a very short arcuato -truncate 

 lobe at tip, the surface not at all impressed. Length 11.0 mm. ; width 

 1.8 mm. Rhode Island (Boston Neck), New Jersey, Pennsylvania and 

 Michigan (Port Huron) - grande Lee. 



This species is not the longest but is by far the stoutest 

 Lathrobiid known to me ; it has rather an extended range and 

 is not rare. 



liathrotropis n. gen. 



This genus is probably peculiar to the true Pacific coast 

 fauna, representing there the eastern Eulathrobium, the 

 species resembling grande in their broadly rounded angles of 

 the head and prothorax and close-set coarse punctures, but 

 differing in their smaller size and much more slender and 

 generally more convex form ; they also have the basal joint 

 of the hind tarsi longer, although distinctly shorter than the 

 second, and the antennae stouter. The species are moder- 

 ately numerous and generally abundant in individuals, those 

 before me being characterized as follows : — 



Head moderate in size, always narrower than the elytra; elytral punctures 

 usually irregular in arrangement 2 



Head large, equal in width to the elytra or wider; species smaller in size, 

 the elytral punctures always serial in arrangement 5 



2 — Head extremely densely, moderately coarsely punctured and dull. Body 

 large in size, rather stout, parallel, very dark rufo-piceous in color 

 throughout, the antennae fuscous, the legs paler, rufous; head but little 

 longer than wide, slightly narrower than the elytra, more distinctly in 

 the female, the sides parallel and straight for some distance behind the 

 eyes, which are moderate in size, rather convex and prominent and 

 between two and three times their own length from the base; angles 

 very broadly rounded, the base arcuato-truncate; antennae very stout, 

 nearly as long as the head and prothorax, gradually incrassate distally, 

 the medial joints about one -half longer than wide in the male; protho- 

 rax elongate-oval, much narrower than the head, moderately coarsely, 

 somewhat closely punctured, the median smooth line distinct but not 

 more elevated and not defined by punctured series; elytra longer than 

 wide, parallel, about a third wider and a fourth longer than the protho- 

 rax, coarsely, deeply and very closely punctate, the punctures without 

 trace of serial order; abdomen parallel, distinctly narrower than the 

 elytra, the segments strongly impressed at base, finely, closely punctate 

 and but feebly shining. Male with a small feeble rounded impression at 



