THE CANADIAN ENTOMOLOGIST. 123 
and laid them about in this manner in spots where the Wild Violets grew : 
thickest, and on my return two or three days after, found six more 
chrysalides, and another larva just about to change. I feel assured that 
with such traps as these laid about in places where they are feeding, any 
one may secure specimens of these larvae without trouble during the first 
week or ten days in June. 1 have never-succeeded in finding them other- 
wise, although I have searched long and often. One of the chrysalides pro- 
duced the imago on the 26th, another on the 27th of June, and others 
at intervals between the 27th of June, and the 4th of July. The speci- 
men which changed to a chrysalid on the roth of June produced the 
imago on the zgth, but this was kept in a cool room all the time, and 
was hence probably longer in perfecting than it would have been if 
exposed to the warming influence of the summer's sun. I should judge 
the ordinary duration of-the chrysalis state, when left in their native 
haunts, to be from fourteen to sixteen days. All the specimens bred 
proved to be Argynnis cybele. 
ON SOME 
LEAF-MINING COLEOPTERA. 
BY V. ‘TY. CHAMBERS, COVINGTON, KENTUCKY, 
It is necessary for me to correct a serious error into which I have 
fallen. 
At page 165, v. 3, I have described a larva mining the upper surface 
of leaves of the White Oak (Quercus alba), which seemed to me to 
answer the requirements of Dr. Clemens’ Lithocolletis tubiferella, which 
also mines the leaves of Quercus alba. The larva was not removed from 
the mine, but viewed through the integument. It seemed to me to 
resemble greatly, if it was not identical with, Dr. Clemens’ species. The 
mine answered, in every respect, to that described by Dr. Clemens. At 
the same time I remarked the peculiar appearance of the larva, which 
“differs from the ordinary flat Zithocolletis larva as much as that does 
from the larva of the first or cylindrical group.” In fact I should never 
have suspected it to be a Lithocolletis larva but for the resemblance, both 
of the mine and larva, to that of Z. ¢ubiferella, as described by Dr. 
Clemens. I did not succeed in rearing the imago, and do not know 
