37 



A A. Footless grubs. 



C. Of various sizes, from medium to minute; front segments 

 usually more or less enlarged; never enlarged in the 

 middle so as to taper towards each extremity, nor curved. 



F. Head small, the segment behind it much enlarged ; 

 body more or less flattened ; bore into the trunks 

 of trees, stems and canes of shrubs ; perfect insect a 

 saw-horned or Buprestian beetle (Exs. flat-headed 

 apple-tree borer and raspberry cane-borer) : 



Buprestidae. 



F F. Head small, segment behind it more or less en- 

 larged, but not usually so much in proportion to 

 the rest as the previous section ; body not, or but 

 slightly, flattened, generally cylindrical, incis- 

 ions distinct; bore into the trunks, etc.; perfect 

 insect a long-homed beetle, with the head verti- 

 cal (Ex. the round headed apple-tree borer or 

 Saperda Lamiides. 



C C. Minute, seldom exceeding one-fourth of an inch in 

 » length ; enlarged in the middle and tapering toward 



each extremity ; curved, with numerous transverse 

 wrinkles; perfect insect a beetle : 



Scolytidae and Curculionidae. 



In addition to this arrangement, we might classify by their meth- 

 ods of operating, thus : Those that bore in the roots ; those that bore 

 into the trunk ; the twig and cane borers ; and the bark miners. 



While this arrangement might have some advantages, it would 

 bring together those differing very widely in every other character, 

 and separate those which are very closely related in every other 

 respect. For example : among the root borers Ave would have side by 

 side an Aegerian and a Pnonus, one a moth and the other a beetle ; the 

 larva of one a caterpillar with sixteen feet, the larva of the other a 

 grub with but six minute feet. As will be seen above, I have 

 made use of these characters to a certain extent in £he synoptical 

 table of the larva?. 



The following list contains most of the borers found in Illinois 

 Avhich are known to injure useful trees or other vegetation to any 

 considerable extent, and which on this account are worthy of notice. 



coleoptera (or those which are beetles in the perfect state). 



As those belonging to this order are described in a subsequent part 

 of this report, we simply refer the reader to the place in this report 

 where they are described, and where he will find the remedies noticed. 



1. Chrysobothris femorata. The flat-headed apple-tree 



borer [See page — .] 



2. Dicera divaricata. The cherry-tree borer " 



3. Dicerca lurida. Hickory-tree borer " 



4. Agrilus rufimlls. Raspberry cane borer " 



5. Agrilus lateralis " 



