Casey — A Revision of the American Paederint. 115 
flattened along the middle throughout, the apex truncate; sixth unim- 
pressed, the apex broadly sinuato-truncate, with a small, broadly trian- 
gular tooth projecting 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 
1.8mm. Rhode Island (Boston Neck), New Jersey, Pennsylvania and 
Michigan (Port Huron)...... cisssiane phe siaedesemne'aies ---- grande Lec. 
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. 
Lathrotropis n. gen. 
This genus is probably peculiar to the true Pacific coast 
fauna, representing there the eastern Hulathrobium, 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 reel elytral punctures 
usually irregular in arrangement... ..cccesece voce cocscccesccevesese Z 
Head large, equal in width to the dive or wider; species wisatioks in size, 
the elytral punctures always serial in arrangement..........seeee008 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 
