48 B.C. Entomological Society. 



Chryaops piocliris. <). 8. This fly appears about the middle of May, is a pest in 

 .Iniie, aud becomes rare towards the eud of July. Its biting habits are much the 

 same as those of C. iiortifcr. 



CJirysops frhiitliis. O. S. This is a comparatively rare species. My best catch 

 was of nine specimens on July ].jth. 1012. On the 2.jith of the same month I caught 

 (inly two. In other years also I have captured only a few si)ecimens. 



Tahaiiiiii Itirfidufi, Bigot. Tliis is invariably the first of its genus to appear. It 

 comes in the latter part of Ma.v. Its season is at its height in June, and it dis- 

 appears about tlie middle of Jul.v. It is undoubtedly the worst pest of cattle on the 

 Lower Mainland. It bites on all parts of the body, but is frequently seen on the 

 teats. 



TahaiiHs nffliiis. Kirby: Ttihtiiiiis- raittotiis. Martin. These flies appear a little 

 after T. liirtulus. They are at their worst in Jul.v. They bite cattle aud horses 

 mainly on the shoulders and face. It seems that animals are very helpless against 

 flies which rest on their faces, especially when they are in the field. In the bush, of 

 course, it is a different matter, as they can simply rub their noses against the bushes. 



Tahunu.H soiininciinis, O. S. It appears about July loth aud continues up to the 

 middle of August. It is the most annoying fly after T. }iiritilus. and bites on the 

 neclv. face, shoulders, and flanks. Its bite appears to cause a good deal of pain and 

 ha'uiorrhage. 



Tahanus insuctus. O. S., appears in the middle (if July and has a short season. 

 It is not a serious pest in those districts where I have collected it. Most of the flics 

 I have caught were biting on the abdomen. 



Tahanus fratellus. Wills. It only occurs in the hottest weather, not before July 

 l.!ith. This fly is a bad pest; it bites exclusivel.v on the abdomen and might easily 

 be overlooked by the casual observer. Its habits are sluggi-sh; it crawls slowly over 

 the hairs aud can easily be taken by hand. 



Tahanus nivosus, O. S. Only seen twice: five specimens were caught. 



Tahanus scquax. Wills. Only a few captured. 



HilvUig gigantnliis, Loew. Appears in July in limited numbers. It bites the 

 neck by preference. 



Tahanus aef/roius, O. S. Taken only on Vancouver Island; occurs in the Dry 

 Belt, but I have not taken it in the Lower Fraser. This is the largest of all the 

 species described. It occurs in July. Considering its size, it seems to cause animals 

 surprisingly little annoyance. 



Notes on other Dipteba. 



It may be of interest to the members for me to give a few notes on other Diptera. 



Stomoa-ys calcitrans. This fly appears with great regularit.v about the middle 

 of April. In three different years its first appearance has been recorded, twice on 

 the 20th and once on the 22nd of April at Mount Lehman, Chilliwack, and Agassiz. 



Hwmatohia serrata, the horn-fl.v, and the black-flies, Simuliidie, appear about the 

 same time, though I cannot give the exact dates. Mosquitoes seem to return each 

 year at almost the same dates, which shows that the seasons must be very similar. 

 In 1910-11 I took careful notes which illustrate this. They were as follows : — 



Culk-ina; (Notes taken at Hit. Lehman, B.C.). 



1910, March 16th: 1911, March 12th. Biting-animals. These were ragged- 

 looking Insects and had no doubt survived the winter. 

 1910, April 21st : 1911, April 2.5th. First larvie. 



1910, May ISth. Larva- aud egg-rafts found in water-butts. 



1911, same period. Not so plentiful. 



1910, July 5th. Mosquitoes scarce. 



1911, .Tuly .5th. Mosquitoes very numerous. 



1911. July .5th. Mos(iuitoes came from the flooded lauds of Sumas prairie, which 



