Casey — A Revision of the American Paederini. 71 
Eyes normally developed; neck never less and frequently more than half as 
wide as the head; prosternum short and broad before the coxae; labrum 
short, rectilinearly truncate at apex, with a rounded median sinus, the 
lobes broad and feebly oblique at their apical margin; antennae varia- 
ble, stout to rather slender; head broadly arcuato-truncate at base.. 9 
9— Body parallel, more or less stout, the gular sutures nearly straight, 
feebly converging from apex to base, near which they are most approx- 
imate, sometimes widely separated and parallel; head well developed 
but never wider than the elytra; prothorax oblong, with the anterior 
angles more or less distinct; elytra generally shorter in the male than 
in the female; body large to moderate in size, the sculpture rather 
coarse and sparse, except that of the abdomen which is minutely 
punctate. Cosmopolitan... ...scesceeeccceccccceeeccoees LAthrOvium 
Body slender and fusiform, moderate in size, sculptured nearly as in 
Lathrobium; gular sutures parallel, arcuate, generally widely separated 
and most approximate at or slightly before the middle of the post-oral 
surface; head small; prothorax oblong, with the apical angles moder- 
ately distinct; elytra larger than in Lathrobium. America..Litolathra 
10 — Gular sutures rather widely separated, parallel and straight to the base. 
Body slender, normally convex, the head well developed but not as wide 
as the elytra, broadly arcuato-truncate at base, with broadly rounded 
angles, the neck a little less than half as wide, the eyes rather small but 
unusually convex and prominent; labrum obliquely bilobed, the lobes 
rather narrowly rounded at tip; maxillary palpi rather short but nearly 
as in Lathrobium, the third joint obconic; antennae moderately thin, the 
joints elongate, subcylindric, rather rapidly narrowed at base; proster- 
num rather long in front of the coxae; prothorax oblong-elongate, with 
the angles distinct, the elytra oblong, parallel, with prominent basal 
angles and feebly subserial punctures, longer and wider than the pro- 
thorax; abdomen parallel, the sides straight, the sculpture very fine and 
dense; legs short, moderately stout; body small in size. Europe. 
*Throbalium 
Gular sutures parallel and arcuate, rather widely separated, most approxi- 
mate at or near the middle of the post-oral surface; labrum broadly, 
obliquely bilobed, the apex broadly and subangularly emarginate 
throughout the Width .......ssesceveeee écinn' p's wile Walks dew okie cevcvell 
Gular sutures very widely separated, most approximate anteriorly, thence 
gradually diverging to the base where they are most remote; labrum 
narrowly, deeply and angularly cleft in the middle, the lobes each sub- 
quadrate in form with its apex obliquely truncate..........see..e02. 12 
11— Body parallel, moderately slender and decidedly depressed, small in 
size, the head subquadrate, rectilinearly truncate at base throughout 
the width, the angles right and not evidently rounded; eyes moderately 
developed, slightly prominent; maxillary palpi short, the third joint 
inflated toward tip; antennae rather long, moderately stout, the joints 
obconic; neck wide, three-fifths as wide as the head; prosternum short 
before the coxae; prothorax short and broad, with the apical angles 
well defined, the polished median line being defined by series of punc- 
tures; elytra oblong, longer and wider than the prothorax, with well- 
