196 CLASS INSECTA. 



either in holes they dig, or under stones, and often do not 

 quit their retreat, except at night. Their colour is generally 

 uniform black. The larva of Ditomus Bucephalus, the only 

 one which has been observed, has the form and habits of 

 Cicindela. These insects inhabit especially the hot countries. 



Three sub-genera, by which we will begin, form, by reason 

 of their labial palpi, terminated by a larger articulation in 

 form of a hatchet or triangle, a particular group. The last 

 of these sub-genera conduct us to Scarites, while the first, 

 which, with reference to the absence of the emargination on 

 the internal side of both fore-legs, make an exception, appear 

 to be connected with the" first sub -genera of the family. They 

 all have strong-toothed mandibles. The exterior maxillary 

 palpi are terminated by an articulation a little larger ; the 

 corslet is in form of a cup, or truncated heart ; the abdomen 

 is pediculated. 



Two of these sub-genera form a special subdivision in this 

 group. Their anterior legs are not palmated. Their an- 

 tennae are composed of articulations nearly cylindrical, or in 

 form of a reversed cone. The chin covers nearly all the 

 under part of the head, as far as the labrum, and often has 

 no transverse suture at its base. The body is very flat, and 

 in many species is without wings. They are all of the old 

 continent, or of New Holland. 



Enceladus, Bon. 



Their fore-legs have no emargination on the internal edge. 

 The first articulation of their antennae is a little elongated, and 

 almost cylindrical ; the third is shorter than the second. The 

 middle of the upper edge of the tongue is advanced like an 

 angle or tooth. The corslet is nearly heart-shaped, broadly 

 truncated, with the posterior angle a little dilated and point- 

 ed. The labrum is emarginated, or nearly bilobed. 



