IIYLESINUS AND ITS WOOD SCULPTURINGS. 



1. — Hiiksinas Fraxiiii, natural size. 



a. ,, ,, magnifiod. 



b. ,, ,, ,, lateral view. 



•0. d. e. Portion of a log of Ash in wliicli B. Fraxini has been 

 reared ; on one side the remains of the bark are removed, shewing 

 at c. the sculpturing of the surface of the wood, the horizontal 

 line being the parent gallery, the vertical lines the grooves cut by 

 the larv£e ; at d. the upper half only of the parent gallery is 

 removed, showing the row of eggshells along its lower side, these 

 retain the ajipearance of the fresh eggs except that they contain 

 only larval frass. At e. the imdisturbed bark shews the exit 

 ;apertxires of the young beetles. 



/. A transverse section (magnified) of a parent gallery after the 

 larvse are hatched ; the young larva being developed in the egg 

 with its head towards the surface, leaves the shell from its upper 

 part, and as it proceeds, stuffs the shell behind it with frass. 

 A thin layer of parental frass covers the free surface of the 

 eggshell. 



2. — Hylesimis crcnatus. 



a. magnified. 



b. Section of Ash bark, with parent Mrrmv o( H. crcnatus, shewing 

 the deep depressions for the eggs, and the irregular tracks of the 

 laira. 



■S. — Jlylcsinus vitkUus. 



a. magnified. 



■b. liark of Elm, shewing parental and larval burrows ofS.vittatvjf, 

 about one-third larger than the natural size. The pupse are indif- 

 ferentl}' at cither end of the short cylindrical larval burrows. 



