70 Trans. Acad. Sci. of St. Louis. 
form; antennae long and slender, the narrowed bases or pedicels of 
the joints strongly compressed; neck two-fifths as wide as the head; 
prosternum feebly carinate almost to the apex; legs thick, the hind 
tarsi long and very slender, with the basal joint extremely short, the last 
joint much the longest; claws long and slender; integuments shining, 
sparsely and not very coarsely punctate, the punctures of the elytra 
confused and not seriate; anterior angles of the prothorax rounded 
and obliterated, the elytra generally shorter than the prothorax. 
BUPOpe oc ccccscvcccces cans Sioa ck SS cee e AU Ree Bees . --*@lyptomerus 
The eyes normal and distinctly faceted.... ...e. cee ccccce -cecsccesccese 4 
4 — Body normally convex, the fourth joint of the maxillary palpi small 
and acute; antennae moderate in length, with the joints not or only very 
feebly compressed at DaSe..c-cesscecececcce rece sececcccesccsesesece 5 
Body strongly depressed; maxillary palpi slender, the fourth joint much 
larger than usual, conical, with the apex truncate; eyes small; anten- 
nae long and rather stout, the joints compressed at base........+++15 
5 — Neck broad, seldom evidently less than half as wide as the head and 
generally more than Halls ss. secseeccccccdasccccecssudeucsdevbdavese © 
Neck narrow, about a thirdas wide as the head......ccccececececevseeld 
6— Hind tarsi longer and more slender, the basal joint much shorter than 
the secona, the fifth very much shorter than the first four combined... 7 
Hind tarsi shorter and stouter, the first and second joints subequal, the 
- first four differing but little among themselves and together frequently 
but little longer than the fifth.....cccceccccceccce seve rccecvcccevessl™ 
7 — Elytra very short, from one-half to two-thirds as long as the prothorax, 
with the basal angles obsolete; hind wings wanting or vestigial; abdo- 
men more strongly, never densely punctate. Body moderately large in 
size, parallel and rather stout, the labrum short, broadly and angularly 
emarginate throughout its width at apex; maxillary palpi rather long, 
not inflated, the fourth joint narrowly aciculate; eyes moderately small; 
gular sutures rather widely separated, parallel; antennae moderate in 
length, very stout but with the joints obconical, the basal joint robust; 
prosternum moderately developed before the coxae; prothorax well 
developed, with the apical angles more or less distinct, the head broadly 
truncate at base, the angles rounded; neck wide, distinctly more than 
half as wide as the head. America......+s.seee sees sees. Apteralinm 
Elytra varying in length from decidedly longer to distinctly shorter than the 
prothorax, always having the basal angles distinct and probably never 
connate, the hind wings present; abdomen always very minutely 
PUNCHate 2... ccrcecccceee seccrccscarcssceresere recesses neceseessees & 
§ — Eyes very small, the head large, much wider than the elytra, truncate at 
the neck which is less than half as wide, the angles very broadly 
rounded; labrum very nearly as in the preceding genus, the maxillary 
palpi moderately long, with the third joint rather inflated distally and 
pedunculate basally, the fourth slender and aciculate; gular sutures 
strongly impressed, straight, moderately widely separated anteriorly, 
gradually converging to the base where they are most approximate and 
rather narrowly separated; antennae well developed and moderately 
thick, the joints obconical; prosternum rather long before the coxae; 
legs somewhat slender; posterior tarsi filiform, with the basal joint 
relatively larger thanin Lathrobium. Eastern America.... Abletobium 
