53^ INSECTA. 



Callidium, 



Which is now divided into three. 



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

 and where the latter is almost cylindrical and simply dilated and 

 rounded in the middle, compose the genus Certaixum of MM. Me- 

 gerle and Dejean(l). 



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 than the head, is 

 flattened and orbicular, have retained the generic appellation of 

 Callidium. A species of this division, 



C. sangidneus; Cerambyx 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 even houses of Paris, in the spring. The 



C. arcuatus; Leptura arcuata, L.; Oliv., lb., 70, ii, 16, 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 rela- 

 tion to tlieir palpi, form of their head, thorax and elytra, as 

 well as in their proportions, present remarkable exceptions or 

 anomalies. 



We will commence with those in which the form of the 

 thorax is very analogous to that of the preceding ones, and par- 

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

 to the base of the elytra, or scarcely narrower, and either al- 

 most cylindrical, or rounded, or nearly orbicular, and wider 

 near the middle in both cases. The last joint of the palpi is 

 sometimes attenuated near the end and terminated 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 

 but little distance from their base, and then become subulate. 



(1) Callidium rajicolle. Fab ; — C. fugax, ejusd.; Callidium setigerum. Germ. 



