1910] Chapman — Scolytus multistriatus Marsh 63 
THE INTRODUCTION OF A EUROPEAN SCOLYTID (THE 
SMALLER ELM BARK-BEETLE, SCOLYTUS MULTI- 
STRIATUS MARSH) INTO MASSACHUSETTS:! 
By J. W. CHAPMAN. 
The Scolytidae are most generally known as bark-borers and 
consequently many entomologists have given the name of bark-beetles 
to the entire group. ‘They area very important group of insects in as 
much as they are very nearly all tree-feeders. For convenience they 
might be put into two classes, those that attack our conifers and those 
that work almost exclusively on our deciduous trees of the forest and 
shade varieties. 
We have found from experience in past years Just how important 
economically are the beetles of the class that infest our conifers, since 
they have caused a loss of several millions of dollars yearly to different 
parts of our country.’ It looks now, from the bark-borer which has 
recently attacked our elms, as though we were going to have an oppor- 
tunity to learn of the second class of beetles in the same manner. 
Europeans have had this problem confronting them for years and it 
has proved to be one of the most serious with which they have had to 
deal, because many of these beetles have become such exclusive feeders 
that they will attack only one kind of tree. 
In Germany the most destructive species to elms is the large Elm 
bark-borer, Scolytus geoffroyi Goetze or the “Grosser Ulmen-Splint- 
kafer” of which Eichhoff gives a good account.’ He reports that 
closely associated with it and occurring on the same trees in a peculiarly 
neighborly or almost symbiotic fashion is the “ Kleiner dichtgestreifter 
Uimen-Splintkafer” (Scolytus multistriatus). Just what this rela- 
tionship signifies other than a social tendency of these insects one can 
hardly say. These two species confine their attacks chiefly to elm 
trees and considered together they are among the most dreaded pests 
in elm growing districts. In France the parks and boulevards of 

1 Contributions from the Entomological Laboratory of the Bussey Institution, Harvard 
University. No. 18. 
2 Hopkins, A. D., Bark beetles of the Genus Dendroctonus, Bull. U. 8. Bur. Entom., 
No. 83, pt. 1; The Genus Dendroctonus, Bull. U. 8. Entom. Tech. Ser., No.17, pt. 1, 
(1909). 
3 Die Europiische Borkenkifer Julius Springer, Berlin, 1881. 
