ORDER COLEOPTERA. 343 



present distinctly five articulations. Their antennae are al- 

 ways denticvilated, for the greater part, in the manner of a 

 saw. 



Some, among them, have the maxillary palpi filiform, or 

 slightly thicker towards the end. 



Cylidrus, Lat. 



Have the mandibles long, very much crossed, terminated in 

 a simple point with two teeth at the internal edge. The first 

 four articulations of the antennas are cylindrical and elon- 

 gated. The following six are serrated, and the last is oblong. 

 The palpi are terminated by an elongated articulation ; that 

 of the maxillary is cylindrical, and the same of the labial is 

 a little thicker, and in the form of an inverted cone. The 

 penultimate articulation of the tarsi is formed of two distinct 

 lobes. The head is elongated. 



The sole species known ( Tricodes cyaneus, Fab.) is found 

 in the Isle of France. 



TiLLus, Oliv. Fab. 



Have the mandibles of middle size, and bidenticulated at 

 the end ; antennae sometimes toothed like a saw, from the 

 fourth articulation to the tenth inclusively, with the last one 

 ovoid ; sometimes terminated abruptly from the sixth, in a 

 serrated knob. The last articulation of the labial palpi is 

 very large, and hatchet-formed. The head is short and 

 rounded. The third and fourth articulations of the tarsi are 

 dilated, and in the form of a reversed triangle. 



These insects are found in old wood, or on the trunks of 

 trees.* 



* Tillus elongatus, Oliv. Col. II. 22. 1. ].; Clirysomela elongata, Lin. 

 Clems unifasiatus. Fab. Oliv. ibid, IV. 76. ii. 21. The first has the antennas 

 serrated from the fourth articulation, and the corslet cylindrical. In the 

 second, the antennae are terminated, beginning from the sixth articula- 



