70 Trans. Acad. Sci. of St. Louis. 



form; antennae loDg 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. 



Europe *GIyptoinerus 



The eyes normal and distinctly faceted 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 base 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 half 6 



Neck narrow, about a third as wide as the head 13 



6 — Hind tarsi longer and more slender, the basal joint much shorter than 



the second, 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 loDger than the fifth 10 



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 Apteraliuni 



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 wiDgs present; abdomen always very minutely 

 punctate 8 



5 — 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 than in Lathrobium. Eastern America. . .. Abletobium 



