It is intended that in the forthcoming volume of the Canadian Entomologist each number shall contain at least one paper addressed especially to beginners in Entomology. Our esteemed coadjutor, Mr. Jas. Fletcher, of Ottawa, has kindly offered to assist in this undertaking, and we hope that other able hands will render all the aid they can.

The larvæ of Arthemis feed on the leaves of willow, aspen, bassyood, and, it is said, on thorn. In the Catskills, the eggs are laid the last days of July or early in August, on young trees, and but one egg upon one leaf. This is placed near the tip, and the newly hatched larva eats away the leaf on both sides of the midrib.

In my investigations of the insects of the Orange tree, I have discovered another curious insect on some branches infested with Scale Insects, and given me by Major A. J. Russell. I at first took them to be Aphides, but on closer examination they proved to belong to Psocus.

The neuration of this European species is as follows : Fore wings 12-veined, 8 out of 7 well beyond the extremity of the accessory cell, 9 out of 8, a comparatively short furcation to costa. Hind wings 8-veined, 5 weaker than the rest, joined to the weak cross-vein which closes the cell; this latter is comparatively shorter than in Spragueia, veins 3 and 4 longer.

P. Dion.

Male—Expands 1.2 inch.

Upper side has the disk, cell and basel areas pale fulvous, the latter much obscured ; costal margin also fulvous, but obscured, and inclining to red in the sub-costal interspaces; the apex and hind margin broadly bordered with fuscous; stigma long, narrow, formed by two velvety-black spots, the lower one a little back of the line of the other; the black arc of cell forms a continuation of stigma and joins a dark stripe which runs along upper side of subcostal to base, the whole forming a sub-triangular inscription such as is seen in Arpa. Secondaries have the disk to base obscure fulvous, but there is a clear fulvous ray on the outer part of this area.