The present paper is intended as a supplement to our knowledge of the Canadian species of Sagaritis, a genus which has been monographed by Mr. H. L. Viereck in his “Preliminary Revision of the Campopleginae in the Canadian National Collection,” published serially in the Canadian Entomologist, Vols. LVII, LVIII.

This interesting aphid (2) is found quite commonly throughout Utah on rabhit brush (Chrysothamnus nauseosus). It was exceptionally abundant along the foothills of the Wellsville Mountains north of Brigham City during the fall of 1926. The oviparous and most of the viviparous forms observed are wingless, while the males are winged.

Nemoria darwiniata Dyar. A single ♀, June 15.

Nemoria hudsonaria Tayl. Quite common during the latter half of June. In a few of the specimens the inner transverse lines are obsolete and these could as well be placed under unilinearia Tayl. as under hudsonaria. I am not sure at the present time whether the differences given by Taylor are of specific value and until I can study the matter further I use the older of the two names.

The material here dealt with has all been obtained by various individuals in the course of bird-banding operations. The habits of these flies are such that their collection is rendered somewhat difficult, for they leave their hosts the instant that the latter appear to be in difficulty and their flight is extremely quick and erratic. Nevertheless, it appears that bird-banding can be made to yield an interesting by-product in the form of increased knowledge of these parasites.