In the early summer of 1926 I spent nearly two months in the vicinity of Lillooet, B. C., a typical “dry-belt” locality, studying the insect fauna of this region. My headquarters were at Craig Lodge, at the east end of Seton Lake, a large body of water about three miles west of Lillooet draining into the Fraser River through Seton Lake Creek, which is joined about a mile to the east by the larger Cayoosh Creek, entering from the south through the deep and precipitous Cayoosh Canyon. The general nature of the country has already been ably indicated by Mr. R. Glendenning in a paper on the Fauna and Flora of Mt. McLean which appeared in the Proceedings of the British Columbia Entomological Society for 1921.