THE CANADIAN ENTOMOLOGIST. 157 
kernels were half eaten up by myriads of larvæ and imagines of Tribciium 
ferrugineum. So completely had they done their noisome work that in 
the numerous samples examined scarcely an intact kernel could be found. 
If a nut was opened the whole interior was often found to be converted 
into a living conglomerate of larva, pupæ and imagines of Tribolium 
accompanied by the larvæ and perfect insects of a Rhizophagus preying 
on the former, the whole mass being wrapped up in a layer of cast-skins 
and excrement. As no purchaser could be found, owing to the deplor- 
able state of the cargo, the work of destruction continued through the 
months of August, September and October, the owners being unwillingto 
take a considerably lower price than had been calculated upon. A fresh 
proof how the marketable value of an article can become reduced through 
delay and ignorance on the part of its owner.” —7%e Zoologist. 
THE Waxy EXUDATION OF HOMOPTERA.—An exudation, corres- 
ponding to that which is characteristic of Aphis Fagi, is common to all 
the several thousand species of Homopterous insects, and appears more 
or less, and in various forms, throughout the tribes, from the singing 
Cicada to the stationary Coccus, and often serves asadefence. In Cicada 
it is slight and powdery ; in some of the tribe, of which the lantern-flies 
are the most conspicuous representatives, it is excessive, and forms waxy 
filaments which surpass the body in length. It hardly appears as an 
emanation from the frog-hoppers ; but in the next family, or Psyllidee, it 
may be often witnessed in gardens by the multitude of white flecks which 
proceed from Psylla Buxi on the box-trees, and fall in showers when the 
branches are shaken. Next come the Aphides, of which the types are 
distinguished by two pipes, whence the streams of honey flow. The 
beech Aphis, or A. Fagi, is less typical and less multiplying than many 
others, and is more sheltered than them from the oviposition of Aphidius 
by the fleecy or gummy substance which it emits. The American blight, 
which belongs to this family, is defended by the abundance of its cottony 
covering. The wax-insect, or Coccus of China, has been mentioned in 
several books, and a Coccus in Arabia produces a substance which is 
called manna, and is supposed by some persons to be identical with the 
manna in the wilderness.—Francis Walker, in Newmans ÆEntomologist. 
THE COLORADO POTATO BEETLE VARYING ITS Foop.—A generally 
received opinion in regard to the Colorado Potato Beetle, Doryphora 
Zo-lineata (Say), is that its food is confined to plants of the family 
Solanaceæ. I have found it this season (June 19,1872) at Port Austin, 
