THE SCOLYTUS. 



187 



hy the shape of its hody, which is obliquely cut off behind, and 

 by the club 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 is slightly variable, but is mostly 

 as follows : — Tlie head is black, wrinkled long'itudinally, and 

 the thorax is very large in proportion to tlie size of the insect. 



1. Hylesinus crenatus. 2. Scolytus destructor. 3. Prionus ccriarins. 4. Tomicus 

 typographicup. 5. Callidiiim violaceum. a. Prionus, lai-ra. 0. Tomicus, larva. 



c. Scolytus, 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 striae 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 lier eggs, she 

 flies to a tree, and searches about the bark for a favourable 

 spot. Having found it, she sets to work and gnaws a hole 



