24 



INTRODUCTION, 



the various species of Scolytidce, of whose appearance and 

 proceedings some idea may be obtained from the accompa- 



1, 2, Tomicus typographus— 3, 4, 5, 6, Hylur^s piniperda (natural size and magnified) . 



nying figures. The gigantic larvae of the lougicorn beetles, 

 goat-moths, Siricidce, &c., are not less destructive, by 



Track cf Typographer Beetle under liark. 



boring through the solid wood of various trees ; whilst an 

 ant {Formica saccharivora), which takes up its abode in the 

 stem of the sugar-cane, has proved at certain periods in the 

 highest degree injurious. But it is upon the leaves and 



