112 IXSECTA. 



Those species, in which the head is at least as wide as the thorax, 

 and where tlie latter is almost cylindrical, and simply dilated and 

 rounded in the middle, compose the genus Certallum of MM. Mc- 

 gerle and Dejean *. 



Those in which the head is narrower than the thorax, elevated, 

 and almost globular, form that of Clitus, Fab. 



Finally, those in which the thorax, also wider tlian the head, is 

 flattened and orbicular, have retained the generic appellation of 

 Callidium. a species of this division, 



C. sanguineus ; Cerambijx sanguineus, L. Oliv., lb., 70, 1. 

 about five lines in length, black, with villous elytra, and thorax 

 of a fine sanguineous red, is very common in: the wood yards, 

 and CA'^en houses of Paris, in the spring. The 



C. arcuaius; Leptura arcuata, L.; Oliv., lb., 70, ii, 1^, which 



is about half an inch long, of a deep black, with two bands on 



the thorax, three arcuated streaks on the elytra, and some points 



on their base and extremity of a golden-yellow, is a Clitus. 



This insect also is very common. 



We will terminate this tribe with Insects, which, in relation to 



their palpi, form of their head, thorax, and elytra, as well as in their 



proportions, present remarkable exceptions or anomalies. 



We Avill commence with those in which the form of the thorax is 

 very analogous to that of the preceding ones, and particularly of the 

 Certalla. It is equal in width to the head, and to the base of the 

 elytra, or scarcely narrower, and either almost cylindrical, or rounded, 

 or nearly orbicular, and wider near the middle in both cases. The 

 last pint of the palpi is sometimes attenuated near the end and ter- 

 minated in a point, and sometimes truncated, thicker, and obconical, 

 at the same extremity. All the thighs are clavate, and supported by 

 an abrupt, slender, and elongated pedicle. The elytra of the greater 

 number are either very short or abruptly narrowed at bvit little 

 distance from their base, and then become subulate. 



In the first place we have those in which no such dissimilitudes are 

 to be found, their forms and relative proportions being always the 

 same as those of the elytra of the preceding Insects. 

 The first genus, 



Obrium, Meg. Dej. — Callidium, Sapekda, Fab., 



Is characterized as follows : the head rounded, and not prolonged an- 

 teriorly in the manner of a snout; palpi filiform, the last joint ter- 

 minating in a point; antennae long and setaceous; thorax long, 

 narrow, almost cylindrical, or forming a truncated ovalf. 

 The second genus. 



* Callidium nificoli , Fab. ; — C.fugax, Ejusd. ; — Callidium setigtrum, Germ, 

 i" See Catalogue, &c., of Count Dejean, p. 110. 



