158 



THE TOUNG NATURALIST. 



ScolytllS intricatUS infest the oak. The female bores a burrow under 

 the bark, especially in the minor branches, where she deposits her ova. The 

 larva makes burrows in various directions under the bark, thus obstructing 

 the flow of sap. It sometimes destroys young trees, but oftener the branches 

 of old trees, although I have seen trees in Dunham Park, which were de- 

 stroyed by this insect, from six to eight inches in diameter. When first I 

 met with this species it was in the branch of an oak in Dunham Park. The 

 larva were feeding under the bark, and I tried to cut a short piece of it, but 

 not succeeding I conveyed it to my home, and from it I reared about sixty 

 specimens. It was then new to this district. 



ScolytllS mgulosus infest the apple tree, the larvse feed under the 

 bark, it is a destructive species, although I have very seldom met with it in 

 this neighbourhood, all the Scolytus feed partly in the bark and partly in 

 the wood, thus cutting off the supply of sap. 



ScolytllS multistriatus also infest the elm, they feed in a similar way 

 to the other species, I have seldom taken this species, although it is very 

 abundant in some localities, from where I have received it from Mr. Chapman. 



Trypodendon domesticum attacks the bark of the beech, in Dunham 

 Park I have often found the perfect insect eating its way into the bark and 

 wood. 



Trypodendron quercUS is found in oak in Sherwood Forest, in which 

 the larva feed. 



T. lineatum is often found protruding from the burrows. It makes 

 burrows in pine trees in Scotland, it bores into the solid wood of recently 

 cut pines. 



Cryphalus binodulus infest the minor branches of poplar. It feeds 

 under the bark, often of decayed branches, but perhaps they are the cause of 

 the decay. 



Dryocsetes villosus infest oak trees. It feeds under the bark, and in 

 it when the trees are large. It makes numbers of winding galleries. It is 

 often found in trees which are infested with Bogous Cigniperda, 



Dryocaetus bulmerinqui feed beneath the bark of the alder. It is a 



very small species, and easily overlooked. Its presence may be detected by 

 the numerous small round holes in the bark of decayed trees, from which the 

 perfect insect has emerged, after completing the destruction commenced by 

 larger insects. It is very local, and has only been found in Drinkwaters 

 Clough, Agercraft, and on the banks of the Bollin above Wilmslow. This 

 species was discovered by Messrs. Morley and Broadhurst, and added to the 

 British list about 20 years ago. 



