OF WASHINGTON. 163 
Disonycha limbicollis, 30 specimens, Limonins auripilis, 8 specimens, 
and Lixus concavus, 8 specimens, were found on June 8 and 13 on a species 
of Rumex. 
Batvle suturalis and Centrinus scutellum-album are common on Ox-eye 
Daisy (Leucanthemum vtilgare} ; the latter species and Rhipiphorus dimi- 
diatus and cruentatus occur on Nepeta cataria. 
The flowers of Viburnum prunifolium yield Molorchus, Sericosomus, 
Agriotes, Attains scincettis, Anaspisflavipennis, and species of many other 
genera. 
Mr. Smith, referring to the note on Helops* said that he had 
never found them except under the bark of trees. Valgus he has 
found very local on Long Island ; a single patch of woods only 
yielding any number of specimens. He described their location 
in the stumps of trees, and the season at which they were found. 
Mr. Schwarz said that his experience agreed with that of Mr. 
Sherman regarding Helops / he has found them under stones near 
the base of trees. He added that it is strange that no one has 
succeeded in finding the larva of Helops in our country, common 
as it must be. 
Mr. Schwarz read the following : 
NOTES ON THE FOOD HABITS OF SOME NORTH AMERICAN SCOLYTID^E 
AND THEIR COLEOPTEROUS ENEMIES. 
BY E. A. SCHWARZ. 
Pityophthorus concentralis Eichhoff, originally described from Cuba, 
must be added to our fauna, since it occurs abundantly throughout the 
semi-tropical region of Florida on the Poison wood (Rktts metoptum.} It 
is closely allied to P. consimilis, but at once distinguished by the sharply 
raised concentric lines on the anterior part of the thorax. Its work may be 
briefly described as follows : By the co-operation of several parent beetles 
a large central chamber of irregular outline is excavated under the thin 
bark of the trunk or larger branches of the tree. Several (from two to five), 
more or less, undulating primary galleries, of not great length, radiate 
from this chamber, and the eggs are deposited singly in little indentations 
either on one side or on both sides of these galleries during the process 
of excavation. The larval galleries are short, either diverging in the usual 
way or frequently intersecting each other, or even reverting to the central 
chamber. The pupal chamber is not sunk into the wood. 
In the middle of June, 1887, 1 found on Mr. Hubbard's Prairie Farm, near 
Hawk Creek, Volusia Co., Fla., a prostrate tree of Black Gum (Liquid- 
ambar styraciflua}, which had been felled in October the previous year. 
Upon beating the branches into my umbrella I found numerous specimens 
of two Scolytids. Pityophthorus pulicarius and another species of the same 
