Having recently put my own collection of Dectcidæ into systematic order and treated the collection of the U. S. National Museum entrusted to me by Dr. C. V. Riley in a similar manner, I have thought it would assist n obtaining better material for a future monogroph if I were to publish at least a generic discriminatio of the material at hand. At the same time I am able to clear up most of the synonymy of the species and assign to therir proper location the various described species, very few of which (7 out of 23) will be found to hae been originally placed in the genera to which they are here assigned.

Expanse of wings one and one-fourth inches. Length of body sixtenths of an inch. Head and antennæ black. Thorax, above black bordered with white, beneath white. Legs white. Wings white, satiny, translucent. Primaries have a slight tinge of yellow. On the costa, near the middle, are two black or drk brown blotches; below these, towards the inner margin, are two other blotches, sometimes united—the whole forming a broken, transverse band.

A single fly, bred from a larva on oak at Boston, Mass., appears to belong to this species. The fly differs from Mr. Cresson's description in that all the tarsi are blackish; the abdomen above is largely blackish; there is no luteous tint discernible on the laterl margin of middle lobe of mesothorax; the anterior and posterior margins of the luteous stigma are blackish and the veins are nearly black.

The numbering of these notes is continued from p. 132.

(9.) Chionaspis ortholobis, Comst. In the middle of March Prof. Bruner sent me a Chionaspis, which he said was common on cottonwood in Nebraska, being also occasionally found on the white willow. It appeared to me to be a new species, and I was about to name it after its discoverer, but Mr. L.O. Howard, to whom I had sent specimens, delared it was ortholobis.

Mr. Wolley Dod has recently sent me from Calgary quite a number of specimens of this form, and I consider it a valid species. The description, however, of Alberta (♂) is quite inadequate. There is great variation in expanse of wing, and in colour. Some examples are dark brown, some are yellow-white, like the pale N. Ridingsii; some are decidedly fulvous, like Varuna.

My last paper dealt chiefly with Ottawa sawflies, and in the present article I venture to describe a few Western species which have been for some time in my collection, and which seen to be unnamed. Synoptic tables are added as an aid to collectors of these insects.

The beetles of this family are more characteristic of Southern latitudes than of cold climes like Canada; of about six hundred species known from America, north of Mexico, only ninety-six are recorded from the Provinces whch form the subject of the present paper. From all other families they may at once be known by the antennæ, terminating in a club composed of lamellæ or plates, which are capable of close opposition or of separation at the will of the insect.