44 
of 11 a. m., July 27, and the same time on the following day. In the 
case of one the aggregate length of the voidings was 242 inches and 
the weight 0.05 gram; in the other the excreta was not in a shape to 
be measured, but the weight was exactly the same. The pupal stage 
was passed within the twig, the escape of the adult having been pre- 
viously provided for and the cavity closely packed with chips at either 
end. The adult issued in the insectary, March 17, 1897. 
Conotrachelus posticatus was reared in great numbers from a lot of 
acorns of Quercus alba, collected November 10, 1896. Many of these 
acorns were already perforated and the larvee had presumably eseaped, 
while very many others were still infested. The acorns were kept in 
the insectary, and on examination July 19, 1897, adults were found 
among them in great numbers, some having evidently quite recently 
emerged, while others had died, thus showing that the adults had been 
developing for some time. Several larvie and a couple of pup were 
also found in small cells in the earth at the bottom of the cage in which 
the acorns were kept. These lary varied much in size, some of the 
smaller being not more than one-fourth the size of the larger and what 
appeared to be full grown. In the adults the size was very nearly 
uniform. 
The grape root-worm, Fidia viticida, has still to be subjugated in the 
vineyards along Lake Erie, the increasing number of parasites not- 
withstanding. Some experiments were carried on last fall with tobaec’o 
dust, and also kainit, placed about the base of the vines to determine 
the possibility of destroying the larve in the ground. A small depres- 
sion was excavated about the base of the vine, varying from 12 to 18 
inches inradius. Tobacco dust, ranging in amount from one-half pound 
to 4 pounds, was placed in those shallow excavations and the surface 
lightly covered with soil. The vines were subjected to treatment July 
29, 1896, and examined October 8 of the same year. The tobacco had 
almost entirely disappeared, no trace being left except a thin, dark- 
brown layer near the surface of the soil. No dead larvie could be found 
about the roots of these vines, while the living ones were present as 
numerously as about those that had not been treated. The kainit was 
applied in the same manner, and also scattered over the surface of the 
ground along the rows of vines. In the excavations the strength 
varied from 4 pound to 8 pounds, but was applied October 8, 1896, and 
the examinations were not made until April 5, 1897. The larve were 
apparently not affected in any way whatever, no dead ones being found, 
even on close examination, while living ones were as abundant as about 
the roots of untreated vines. In one case especially, where an appli- 
eation of 4 pounds had been made, and the kainit piled up directly 
about the crown of the vine, the larve were observed working appar- 
ently uninjured in soil among which the kainit was clearly perceivable, 
numerous masses of the size of a pea being found. Samples of the soil 
from about the roots of some of these treated vines were secured and 
tested to determine the penetrating power of the kainit. 
es ao ke ee eee oe 2 
a 
