48 THE CANADIAN ENTOMOLOGIST 



Cercopidae, Membracidae, Cicadellida? and Fulgoridse, taken chiefly by the author 

 in the vicinity of Mctoria and on the Saanich Peninsula to the north of the city, 

 though a few were collected in the Okanagan District. Dates of capture 

 arc given for nearly all the species. The list numbers Gl species, and as little 

 is known of the Hemiptera of British Columbia it is a welcome contribution 

 to our knowledge of the subject. 



A Revision of the British Columbia Species of the Geometrid Genus Hydrio- 

 menaWnh. — By E. H. Blackmore. Pp. IC— 26. This paper gives a brief review of 

 recent work on this genus, leading up to its present clearly defined status; fol- 

 lowed by notes on the characters of recently-described species from British 

 Columbia, with particular reference to the form of the uncus. Figures of this 

 structure are given for 16 species and varieties. Of the 68 species described 

 from North America north of Mexico 20 have been taken in British Columbia, 

 and 18 of these are reported from Vancouver Island. The paper concludes 

 with a complete list of the British Columbian species. 



Notes on the Aeolothripidce. — By R. C. Treherne. Pp. 27—33. A valuable 

 synopsis of this family, which is the most generalized of the order Thysanoptera. 

 Notes on the taxonomic position of the family are followed by keys to the sub- 

 families, genera and species. There are 7 genera and 16 species discussed, 9 

 of the latter belonging to the genus Aeolothrips. Characters other than those 

 of the wings are used, on account of the occurrence of brachypterous forms in 

 some of the species. Antennal and wing characters of the species of this genus 

 arc illustrated. Unfortunately there are no references to distribution of the species. 



Three Years Collecting in the Lillooet District.~By A. W. A. Phair. Pp. 

 34—36. Describes a collecting trip lo the summit of Mount McLean with the 

 main object of capturing Oeneis beani, in which the author was successful. On 

 this and subsequent trips a number of other interesting alpine Lepidoptera 

 were taken. The mountain is described as a remarkably rich collecting ground 

 and is easily reached from the town of Lillooet. 



Natural Control Investigations in British Columbia. — By John D. Tothill. 

 Pp. 37—39. Mr. Tothill, whose work on the natural control of the Forest Tent 

 Caterpillar and the Fall Webworm in New Brunswick is well known, investi- 

 gated these insects in the West in 1918. The Forest Tent Caterpillar was studied 

 at Red Deer, Alberta, where a serious outbreak has been in force for three years, 

 and in the Lower Fraser Valley, where conditions are unfavorable for the insect . 

 In the former locality the parasites which usually serve to bring this insect 

 under control, were not found, but in the Fraser \^alley and on the lower end of 

 Vancouver Island these parasites were present in numbers, preying upon the 

 Western Tent (M. pluvialis) ; and the author suggests that it would be well 

 worth while to collect these for liberation at Red Deer. 



An undescribed Tachinid related to Compsilura is the most important 

 factor in the control of the Fall Webworm in British Columbia, and attempts 

 will be made to introduce it into the region east of Winnipeg. 



The mite Hemisarcopics mains, the most important single factor in the 

 control of the Oyster Scale in the Flastern Provinces, but which has been un- 

 known in British Columbia, has been liberated at several points in this Province, 

 and will be kept under observ^ation for the next few years, 



Mailed February 28th, 1920 



