HICKORY BARK BEETLES. 297 
It is probable that the young of this and other borers in the hickory 
are devoured by two species of Cleridse bred by Dr. Le Conte, viz : 
Chariessa pilota and Phyllobcenus dislocatus. The former has been ob- 
served by Mr. Harrington in the act of devouring Agrilus egenus and 
Magdalis olyra. 
Several other species of Clerid beetles are said by Mr. Harrington to 
commonly occur on the hickory and are beneficial to the tree. 
36. Xyleborus ceUus Eichhoff. 
Order Coleoptera; family Scot«ytid.£:. 
This bark-borer has been bred by Dr. Le Conte from the twigs of the 
hickory. 
37. Magdalis olyra (Herbst). 
Mr. F. C. Bowditch, in the Quarterly Journal of the Boston Zoolog- 
ical Society (1884), remarks that this weevil, which has heretofore only 
been known to burrow in the red oak (see p. 80) has been found to infest 
various species of hickory. The larvae " tunnel the bark in every direc- 
tion, leaving only just enough tissue to prevent the bark warping away 
from the tree." He adds : 
As far as my observations extend the species appears to prefer small trees, from 
four to six inches in diameter. * * * If the tree is small and very badly infested 
it dies very quickly, and shortly after the beetles have escaped the bark is apt to 
flake off or curl up in quite large pieces. 
38. Magdalis barbita Say. 
" The beetles," states Mr. Harrington, " are found during the sum- 
mer months, puncturing the bark of dead and felled hickories, and the 
larvae live in great numbers in the bark or between it and the wood. I 
have found the beetles most abundant from the 15th to the 30th of 
June." (Report, etc., 50.) 
The beetle. — Black ; prothorax closely punctured ; the rounded sides projecting in 
front in a short acute tubercle. The head prolonged into a slightly curved beak, 
not deflexed, and as long as the prothorax. The elytra have deep punctured striae, 
and are as long as the head and prothorax together. Scutellum covered with white 
hairs. Length, 6-7 mm . (Harrington.) 
39. Acoptus suiuralis Le Conte. 
As this weevil is said by Mr. Harrington to bore abundantly in dead 
hickories, in company with Magdalis olyra, it presumably infests living 
trees. 
The beetle. — A small black weevil, densely clothed beneath and more sparsely above 
with short yellowish hairs. The elytra are striated and in unrubbed specimens have 
a wide band of yellowish pubescence across the base, and a narrow one near the tips, 
which are black, as is also the space between the bands ; a white line along the 
suture interrupts the basal band. (Harrington.) 
