3G 



the larvae of the other long-horned wood-beetles. Those of the sub- 

 family, Prionides, are large, broad, somewhat flattened, and largest in 

 front] one of them, the larva of the broad necked Prionus (Prionus 

 laticollis), which infests the grape and apple roots, when fully grown, 

 is nearly three inches long; the legs are very minute. 



The larvae of the sub-family, Cerambycides, resembles those of the 

 Prionides, in having six legs, but the body is more cylindrical, the in- 

 cisions between the segments are more deeply impressed, and they 

 are usually smaller, so far as Illinois species are concerned. They 

 work in the trunks of various trees, or in twigs — the locust tree borer 

 (Clyturobinise), the ash-tree borer (Neoclytus capras), and the honey- 

 locust borer (Eburia quad rigeminata), being familiar examples of the 

 trunk-borers of this sub-family, and oak-twig pruner or borer (Elaphi- 

 dion paraUelvm) of those which inhabit the twigs or small branches of 

 trees. 



This hasty sketch will give the reader an idea of a method of group- 

 ing borers by their larval characters, which will assist him very 

 greatly in arriving at a correct idea of the perfect state of any wood 

 boring larva with which he may meet which is new to him. In order 

 to make it as brief as possible, I present it here in the form of a 

 synoptical table: 



WOOD-BORING LARVA. 



A. Possessing legs or feet. 



B. Having more than six feet ; usually sixteen. 



C. Large size, true caterpiller, cylindrical ; boring into the 

 wood of the trunk ; perfect insect a large moth. (Ex. 

 Locust-boring caterpiller) Xyleutes. 



C. C. Small, usually somewhat flattened beneath; boring into 

 the roots of trees, stems and canes of shrubs, or min- 

 ing under bark; perfect insect a moth with partially 

 transparent wing. (Ex. Peach-root borer.). .Aegeriadac. 



B. 15. Having but six legs. 



I). Tail terminating in a horny spine or point; boring into 

 the trunk ; perfect insect wasp-like. (Ex. Pigeon 

 Tremex) Uroceridae. 



D. D. Tail without a spine. 



E. Large size, somewhat flattened, largest in front, and 

 tapering backwards; infesting the roots of grape- 

 vines and trees : perfect insect a large brown, flat- 

 tened beetle. (Ex. broad-necked Prionus. ).. Prionides 



E. E. Illinois species, medium size to small; cylindri- 

 cal, sometimes enlarged in front, sometimes 

 nearly equal in size throughout; incisions dis- 

 tinct ; bore into the wood of the trunk, some 

 * into twigs ; perfect insect a long-homed beetle, 

 with the head not vertical. (Exs. Loccust-tree 

 borer and Oak-twig pruner.) Cerambycides. 



