COLEOPTERA. 285 



selves either in holes which they excavate, or under stones, and fre- 

 quently 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 larvae of 

 the Cicindelae. They are more particularly proper to hot countries. 



The three first subgenera, on account of their labial palpi, which 

 are terminated by a larger, securiform or triangular joint, form a 

 particular group; the last of these subgenera leads us to Scarites, 

 whilst the first, which, as respects the absence of the emargination 

 in the internal side of the two anterior tibi.», constitutes an excep- 

 tion, seems to connect itself with the first subgenera of the family. 

 They all have stout and dentated mandibles, The external maxil- 

 lary palpi terminate in a rather larger joint; the thorax has the form 

 of a cup or truncated heart; the abdomen is pediculated. 



Two of the subgenera of this group form a special subdivision. 

 Their anterior tibiae are not palmated. Their antennae consist of 

 cylindrical joints, or such as resemble reversed cones. The mentum 

 covers the whole under part of the head as far as the labrum, and 

 frequently exhibits no transverse suture at its base. The body is 

 much flattened, and is apterous in several. They all belong to the 

 eastern continent or to New Holland. 



Enceladus, Bon. 



The inner side of the anterior legs unemarginate; first joint of the 

 antennae but little elongated and almost cylindrical, the third shorter 

 than the second; middle of the superior margin of the ligula pro- 

 jecting in the manner of an angle or tooth; thorax almost in the 

 form of a broadly truncated heart, the posterior angles slightly di- 

 lated and pointed; labrum emarginate or nearly bilobate. 



Encel. gigas, Bon., Mem. of the Acad, of Sc. of Tur. The 

 only species described. From the coast of Angola. 



SiAGONA, Lat. — Citciijus, Galerita^ Fab. 



A very decided emargination on the internal side of the two ante- 

 rior tibiae; the first joint of the antennae elongated, forming a reversed 

 cone, and the second shorter than the third; summit of the ligula 

 straight, without any projection; thorax almost in the shape of a 

 cup, nearly as long as it is broad, and without posterior projections; 

 the labrum dentated. 



Some are apterous and have an oval abdomen(l). The latter is 



(1) Siagona rufipes, Lat. Gener. Crust, et Insect., I, vii, 9; Cucujus rufipes. 

 Fab.; — Siagona fuscipes, Dej., Spec. I, p. 359. 



