364 INSECTA. 



same habits. This tribe is very numerous, and forms a most difficult 

 study. 



The Carabici are now variously subdivided. Each section consisting of 

 numerous genera. We find, 



1. The TRusrcATippEsrifES, so called because the posterior extremity of 

 their elytra is almost always truncated. The head and thorax are narrower 

 than the abdomen. The ligula is most commonly oval or square, and is 

 rarely accompanied on the sides by salient divisions. 



This section consists of Jlnihia, Graphipterus, Aptinus, Brachinus, Casno- 

 ma, &.c. &c. 



2. The BIPARTITI, which in relation to their habits might also be styled 

 Fossores, is composed of Carabici with elytra either entire or slightly sinu- 

 ated at their posterior extremity; having frequently granose and geniculate 

 antennae? abroad head, large thorax, usually shaped like a cup or almost 

 semi-orbicular, and separated from the abdomen by an interval which causes 

 the latter to appear pediculated; the legs generally but slightly elongated, 

 their tarsi usually short, and similar in the two sexes, or nearly so, without 

 any brush beneath, and simply furnished with ordinary hairs or cilia. The 

 two anterior tibiae are dentated, and in several palmated or digitated; the 

 mandibles frequently strong and dentated. There is a tooth in the emar- 

 gination of the mentum. They all keep on the ground, conceal themselves 

 either in holes which they excavate, or under stones, and frequently only 

 leave their retreat at night. They are usually of a uniform black. The 

 larvae of the Ditomus bucephalus, the only one that has been observed, has 

 the form and mode of life of the larva of the Cicindelae. They are more 

 particularly proper to hot countries. 



The genera are Enceladus, Siagona, Pasimachus, Scarites, &c. &c. 



3. The QTJADRIMANI includes those, otherwise similar to the last in the 

 pointed termination of the posterior extremity of their elytra, in the males 

 of which the four anterior tarsi are dilated; the three or four first joints are 

 in the form of a reversed heart or triangular, and nearly all terminated 

 by acute angles; they are usually furnished underneath (the Ophoni ex- 

 cepted) with two ranges of papillae or scales, with an intermediate linear 

 space. 



The body is always winged, and generally oval and arcuated or convex 

 above; the thorax is wider than it is long, or at most nearly isometrical, 

 square or trapezoidal. The head is never suddenly contracted posteriorly, 

 and the antennae are equal throughout, or slightly and insensibly thickened 

 near the extremity. The mandibles are never very strong. The exterior 

 palpi are terminated by an oval or fusiform joint, longer than the preceding 

 one. The tooth of the emargination of the mentum is always entire, and in 

 some is wanting. The legs are robust, the tibiae spiny, and the hooks of 

 the tarsi simple. The intermediate tarsi, even in the females, are short, 



