MAPLE BORERS. 
389 
injured by blazing or peeling of bark, this little beetle may frequently 
be seen boring into the exposed wood, or if the injury is an old one, 
perhaps numbers may be found emerging." 
This beetle, Mr. Devereaux writes me, is found in New York in great 
abundance in the larval state in timber, logs, and cord- wood. It 
deposits its eggs in the summer of the year in which the tree is cut; 
many generations following each other for a number of years in the 
same log. 
The beetle. — Brownish, with the head almost hidden by the prothorax. The male 
much smaller, with reddish pectinate antennae. Length, 5 mm . 
14. Eupsalis minuta (Drury). 
Mr. Harrington records collecting about twenty of these beetles from 
under the bark of a large fallen sugar maple. " The larva? had appa- 
rently lived chiefly on the inner layers of the bark and on the sap wood. 
On another occasion I found specimens emerging from a maple stuinp.' ? 
(See Oak Insects, p. 69.) 
15. The sugar-maple timber beetle. 
Corthylus punctatissimus (Zimm.) 
Order Coleoptera; family Scolytid^e. 
The devastations of this beetle have been described by Dr. C. H. 
Merriam in the American Naturalist for January, 1883 : 
I noticed that a large percentage of the undergrowth of the sugar maple in Lewis 
County, northern New York, seemed to be dying. The leaves drooped and withered, 
a c d 
Fig. 144. Mines of Corthylus punctatissimus.— Merriam del. 
and finally shriveled and dried, but still clung to the branches. The majority of the 
plants affected were bushes a centimeter or two in thickness, and averaging from one to 
two meters in height, though a few exceeded these dimensions. On attempting to 
pull them up they uniformly, and almost without exception, broke off at the level of 
