198 
Mr. Hopkins, referring to the Agrihis attack on pear trees mentioned 
by Mr. Smith, said that he had observed two distinct species, one 
attacking beech and the other Cornus Jlorida. He also exhibited 
examples of Agrilus injury to Populus quadridentata, which had been 
grown over by healthy wood, indicating that the larvae undoubtedly 
bore in the living wood. This fact,, he said, was also evidenced in the 
work of the raspberry Agrilus, and the evident intention of these 
insects in working, as they almost invariably did, in such a manner as 
either to completely surround and girdle the plant, or, in the case of 
larger trees, to zigzag across it, was to effect the partial disease or 
death of the plant. 
In reply to a query by Mr. Smith, Mr. Hopkins said that the burrows 
in beech and Cornus were similar to the ones exhibited in Populus. 
Mr. Smith said that the peculiarity of the burrows of the pear species 
was their extraordinary length. Mr. Lintner said that he had hitherto 
supposed that the poplar Agrilus attacked only cut timber, and that he 
had taken great numbers of them about such wood, but had failed to 
notice any of them in the act of ovipositing. 
Mr. Howard suggested, in reference to the use of arsenated bran as 
an insecticide, that perhaps Mr. Parry, whom Mr. Smith had named 
as the originator of this insecticide, had been reading some California 
literature on the subject. He called attention to the fact that this 
mixture had long been used in California as a means against locusts 
and cutworms, and reports on its use have been printed in the publi- 
cations of the Division of Entomology and elsewhere. Mr. Smith, 
however, was of the opinion that the use of this mixture was original 
with Mr. Parry, who was unaware of its prior use elsewhere. 
Mr. Marlatt, referring to the pear blister mite discussed in Mr. Smith's 
paper, said that a new Phytoptus affecting pear leaves had been 
brought to his notice by Mr. Waite, of the Division of Vegetable 
Pathology. This species differed from the blister mite in that it lived 
exposed on the under surface of the leaf, causing a slight granular 
appearance of the leaf surface, with a reddish or brownish tinge, and 
the curling of the leaves. He said that in Maryland this mite was 
quite abundant, whereas the blister mite was rarely met with. The 
injury from this mite seemed to be comparatively slight. 
Mr. Smith said that he had also seen the condition of the foliage 
described by Mr. Marlatt. 
Mr. Davis then read the following paper : 
SPECIAL ECONOMIC INSECTS OF THE SEASON. 
By G. C. Davis, Agricultural College, Mich. 
One can hardly fail, in a year's correspondence, to learn some new 
facts in an economic line regarding insects. This year I have obtained 
much information in this way, which I have endeavored to bring 
