52 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 17 
fastening them with silken threads, living within the enclosure thus 
formed. 
In Canada, the larva has a wide range of food plants. In Nova 
Scotia it has been found on raspberry, currant, hawthorne, lilac and 
sycamore; in British Columbia on crataegus, hazel, birch, cherry, 
privet, plantanus, American elm, maple, oak, linden, laurel, lilac, rose, 
black currant, loganberry, willow, wild plum, lombardy poplar and 
blackberry. 4 In addition, in the same province in 1923, Mr. K. F. 
Auden, one of our Investigators, found the larvae on apple, plum, pear, 
ash and European broom (Cytisus scoparius). 
Distribution in Canada 
Cacoecia r os an a L., has been found in Canada only in the provinces of 
Nova Scotia and British Columbia—so far as our records indicate. 
The actual localities are Syndey, N. S., Truro, N. S.; New Westminster, 
B. C., Vancouver, B. C., and Victoria, B. C. In the latter province its 
range according to Mr. W. Downes, in charge of our Victoria, B. C., 
laboratory, extends over the southern coastal region. 
Description and Habits 
The Egg. The egg is about .75 mm., in width, rounded in outline’ 
much flattened, raised in centre, in general scale-like in appearance. 
When laid the egg is of a pale green color. The eggs are laid, on the 
bark, in a mass and overlap. In 1922, Mr. W. Downes, examined a 
number of egg masses and reported that the largest one contained 102 
eggs, and the smallest 23, the average number in each mass being 60. 
As the eggs age, the mass becomes darker but not so dark as the bark 
upon which they have been deposited. The egg mass is irregular in 
shape, some being rounded, others elongated. In length the egg masses 
vary from 5 to 9 mm. Several masses may be laid close together, in 
fact we have found in several instances, the egg masses overlapping. 
We have no data on the early stages of the insect in eastern Canada, 
but in British Columbia, Mr. Downes has informed me that in 1922, 
the eggs commenced to hatch about April 15, and that the actual date of 
hatching apparently depends upon the host on which they are laid. 
On April 26, at Victoria, B. C., egg masses on rose and poplar, both of 
which had begum to come into leaf, were found to be all hatched, but 
eggs laid on laurel, which had not at that time any young leaves, were 
still unhatched. On a small basswood tree, Mr. Downes counted 160 
egg masses. 
4 Downes, in litt. 
