76 Trans, Acad. Sci. of St. Louis. 



23 — Form slender, parallel, moderately convex, the tactile setae at the sides 

 of the body small and feebly developed; head moderate, not quite 

 as wide as the elytra, broadly arcuato-truncate at base, with the 

 angles not rounded; front normal; eyes well developed; maxil- 

 lary palpi moderately long, the third joint slightly inflated, the fourth 

 acute and slender toward apex; gular sutures widely separated; most 

 approximate anteriorly, before the middle strongly arcuate, diverging 

 widely to the base; antennae rather slender but very gradually and 

 distinctly incrassate, the joints obconic; labrum edentate; neck barely 

 two- fifths as wide as the head; prosternum short before the coxae; 

 prothorax short, obtrapezoidal, with the angles distinct; elytra but little 

 longer or wider than the prothorax, with a few fine punctures arranged 

 serially; abdomen parallel, finely, sparsely sculptured; legs rather long, 

 slender; posterior tarsi slender, filiform, the first joint elongate, the 

 first four decreasing in length, the fifth about as long as the first. Sub- 

 tropical America Dacnochilns 



Form very stout and short, broadly convex, the lateral tactile setae long 

 and conspicuous; head very short, much wider than long, trapezoidal; 

 eyes moderate or rather small; frontal margin somewhat advancing far 

 above the base of the labrum, broadly rounded; labrum bidentate; 

 maxillary palpi rather small and slender, the third joint but very feebly 

 inflated; gular sutures as in Dacnocliilus , widely separated, strongly 

 arcuate, most approximate a little before the middle, thence more widely 

 diverging to the base than to the apex; antennae rather short, slender 

 and subfiliform; neck relatively slender, not more than a third as wide 

 as the head; prothorax short and transverse, the angles distinct; elytra 

 short and transverse but longer than the prothorax, irapunctate; 

 abdomen short and broad, very densely punctulate and dull, gradually 

 narrowed posteriorly; legs relatively short and slender, the tarsi nearly 

 as in Dacnochilus but shorter. Tropical and subtropical North and South 

 America Acalopliaena 



Of the genera described in the above table not occurring 

 within the geographical limits of this study, attention might 

 be directed to the superficial similarity between Glyptomerus 

 Miill (= TypJdobiiun Kr.), Domene Fauv., and the American 

 ApteraMum, they all having short, in some cases possibly sub- 

 connate, elytra and vestigial or wholly al)orted wings, judg- 

 ing from their external f acies. Throhalium Rey, has the usual 

 habitus, but the very small Pseudobium Rey, is of peculiar 

 appearance, being unusually slender, with the coarse punc- 

 tures of the elytra arranged in regular lines which are rather 

 strongly impressed, more so than in any American genus; 

 there is also a notable extension of the prosternum before 

 the coxae. The two genera Achenium Curtis, and Scitiiba- 

 lium Er., are evidently related by their general characters, 



