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 
Jonger 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 thefirst. Sub- 
tropical AMECTICA... 0... ccccccccccce vce cvccesccccccceess DPACHOCKIIUS 
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; frental 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 Dacnochilus, widely separated, strongly 
arcuate, most approximate a little before the middle, thence more widely 
diverging to the base than tothe 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, impunctate; 
abdomen short and broad, very densely punctulate and dull, gradually 
narrowed posteriorly; legs relatively short and slender, the tarsi nearly 
asin Dacnochilus but shorter. Tropical and subtropical North and South 
AMOVICK. :abdsceaceun nese ad wlah wielle tale soceceeecesees ACAalophaena 
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 
Mill (= Typhlobium Kr.), Domene Fauy., and the American 
Apteralium, they all having short, in some cases possibly sub- 
connate, elytra and vestigial or wholly aborted wings, judg- 
ing from their external facies. Throbalium Rey, has the usual 
habitus, but the very small Pseudobium Rey, is of peeuliar 
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 Scimba- 
lium Er., are evidently related by their general characters, 
