On the Infestation of Elm Bark-Beetles (Scolytidæ) by a Nematode, Parasitylenchus scolyti n.sp.

Of the insects responsible directly or indirectly for losses in plant industry the Scolytidæ or bark-beetles are well known, particularly to those associated with the practice of forestry, in Europe and America through the effects of their outbreaks. Bark-beetle attacks have resulted in serious damage in many parts of the world although in Britain their depredations have been less severe probably owing to the limited extent of forest lands.