Prof. C. V. Riley, of U. S. Dept. Agriculture, says : "In preparing a bulletin on the subject of canker-worms, to be issued from this department, I find that much of our present information is of little service, for the reason that until the year 1873, two entirely distinct species of Canker-worms were confounded in description, seasons, habits, and geographical distribution. In many of the publications, of later date even, the distinction is made either not at all or insufficiently.

"The most widespread and best known species is the spring canker-worm (Paleacrita vernata, Peck). The female rises from the ground chiefly in spring, and secretes her ovoid and delicate eggs. The second species is Anisopteryx pometaria,. Harris, and the female rises chiefly in the fall, and lays her eggs in serried and exposed masses.

"Will you please give such information as you possess, especially upon the following points, in regard to the occurrence of canker-worms in your own locality: 1. Which species, if either, is now found in your own locality, or has ever been found? 2. When was it first observed there? 3. During what years has it been especially injurious? 4. During what years has it been entirely unnoticed? 5. Has the appearance of the perfect or parent insect been confined to either season, the fall or the spring, or has it covered both?

"Wherever any doubt can or does arise in regard to the species observed, it is particularly requested that specimens may be sent to the Department. All expenses for packing and postage will be reimbursed to the contributors if a request to that effect is made; or boxes and stamps for the return of specimens will be sent to any person who will notify the Department of intention to contribute information and specimens.

" Observations may be made during all mild weather from the present month (November), until the middle of June. The more frequent and detailed the observations the greater will be their value. If you have not the time or inclination to make these observations personally, you will confer a favor by handing this circular to some person who will be interested.

"Should this circular come to the hands of any entomologist familiar with the two species, I would respectfully ask of such any information they may possess that will throw light on the range and preferred food-plants of either."