474 DESCRIPTION OF THE MUSEUM. 



keep under the bark or at the foot of trees, and 

 fly only by night. Amongst the exotic species 

 some, such as the speciosus (n° 23), are ornamented 

 with very brilliant metallic colours. The genus 

 cerambyoc, to which that of the lamia, Fabr., is 

 here united, comprehends a great number of 

 species which have their thorax tuberculated, 

 and are in general very large insects. The c. he- 

 ros, Fabr. (n° 2), is common in oak forests ; its 

 larva is probably that known by the Romans 

 under the name of cossus, and which they 

 esteemed a delicacy. The c. moschatus, Lin. 

 (n° 8), lives on willows, etc. This species, which 

 is of a bronze or bluish green colour, diffuses a 

 strong odour of roses and musk which can be 

 smelt at a considerable distance, and even after 

 the insect is dead. Another, which has a little 

 tuft of hair at each joint of its antennae, the c. TV- 

 s' alia (n°7), has the same properties, and is found 

 on the Alps and Pyrennees. The same remark 

 has been made of several exotic species. That 

 which is named after M. Desfontaines (n° 26) 

 was in the collection that professor brought over 

 fromBarbary. The c. longimanus (n°45), or long- 

 limbed cerambyx is easily recognized by its mar- 

 bled wing-sheaths, the extreme length of its an- 

 terior feet, and its extraordinary size. The larva 

 of lamia gigas (n° 78) lives on the baobab tree of 



