THE SCOLYTUS. 



187 



by the shape of its body, which is obliquely cnt off behind, and 

 by the cluV) of the antennae, which is three-jointed, solid, and 

 flattened. The last joint but one of the tarsus is cleft. 



The colour of our species ts slightly variable, but is mostly 

 as follows: — The head is black, wrinkled lonoitudinally, and 

 the thorax is very large in proportion to the size of the insect, 



1. Hylesinus crenatus. 2. Scolytns destructor. 3. Prionus ccriarius. 4. Tomicos 

 typographiciis. 5. Callidium violaceum. a. Priouus, lai-ra. 0. Tomiciis, larva. 



c. Scolytns, larva. 



and is covered with very small punctures. The elytra are 

 sometimes black, sometimes pitchy, and sometimes bright- 

 chestnut, and are striated, the spaces between the strife being 

 punctured. So much for the appearance of this Beetle — we 

 will now proceed to its history. 



When the mother Scolytus is about to deposit her eggs, she 

 flies to a tree, and searches about the bark for a favoiu'able 



spot. 



Having found it, 



she sets to work and gnaws a hole 



