298 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 
40. Tremex col umba {Linn.). 
From the following letter, which we have received from Mr. James 
Angus, of West Farms, N. V., it seems probable that Tremex columba 
injures the hickory by boring into the trunks. So good and exper- 
ienced an observer as Mr. Augus would not think of referring the 
writer to the attacks of this borer if there were not some foundation for 
his suspicions. 
The hickory trees are all dying around here. I should say that one-half of the 
ti.es have died within two or three years. In woods that are not crowded and of 
mixed woods it is quite common to find as many M from three to six dead trees 
within a stone's throw. Great numbers of Rhyssa atrata and lunator are now to be 
seen on the trunks of partially decayed trees. Earlier in the season the Tremex were 
also abundant. Can it be the latter insects that are doing all this mischief t 
Mr. Tyler Townsend confirms Mr. Angus' statement in a note re- 
ceived while this report was passing through the press. 
In regard to Tremex columba I have found large numbers of the dead adults in 
February in a stauding, dead trunk of hickory in Michigan. They were found as 
they had died in their burrows, being unable to penetrate the hard bark or else having 
perished from parasites, for numerous remains of Rhyssa were present. In every case 
the heads of the unfortunate Tremex pointed towards the bark, which they had 
been unable to pierce. 
41. Osmoderma eremicola (Knoch). 
This beetle has been observed by Mr. \V. H. Harrington to feed 
u upon the sappy, partly decayed wood, enlarging the wound aud caus- 
ing further decay, and thus injuriously affecting the tree. He found 
the insect in the pupa state, inclosed in oval cocoons made from parti- 
cles of the wood, in a small hollow where decay had commenced from 
the breaking off of a limb. The cocoon is made in autumn, the beetle 
appearing the following July. Its larva is said to closely resemble the 
common white grub, or young of the May beetle. 
AFFECTING THE BARK. 
4J. Thk hickory-bark louse. 
Lecanium vary a' (Fitch). 
Order Hemiptera ; family CocciD-E. 
Fixed to the bark of the small limbs, a large, very convex oval scale of a black 
color fading to chestnut brown, in May dusted over with a white powder. Length 
often 0.40 by 0.25 inch in width. (Fitch.) • 
43. The hickory blight. 
Erio8oma caryw (Fitch). 
Order Hemiptera ; family Aphidj:. 
Forming a docculentdown coating the under side of the limbs, especially of bushes 
and young trees in shaded situations, multitudes of wooly plaut lice. 
Winged individuals.— Black, with the head, scutel. and abdomen covered with a 
white cotton-like substance, the fore wings with an oval salt-white spot near the tip 
of their outer margin, the veins being obsolete. Length to the tip of the wings 0.12 
inch. On walnut bushes in Illinois. (Fitch.) 
