THE CANADIAN ENTOMOLOGIST. 157 



kernels were half eaten up by myriads of larvae and imagines of Tribcli urn 

 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, pupae and imagines of Tribolium 

 accompanied by the larvae 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." — The 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 as a defence. 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 Psyllidae, 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 IVa/ker, in Newman's Entomologist. 



The Colorado Potato Beetle Varying its Food. — A generally 

 received opinion in regard to the Colorado Potato Beetle, Doryphora 

 io-lineata (Say), is that its food is confined to plants of the family 

 Solanaceae. I have found it this season (June 19, 1872) at Port Austin, 



