40 B.C. EXTOMOLOGR'.VL SOCIETY. 



and is tlie We.steni representative of H. autumnalis, Strom., differing from tbis latter 

 species in liaviug red sliadings to lines and mesial .space. Strange to say thai, 

 altliongh cnlifnni'mla has no described varieties of the Eastern form occurring here, 

 there is one which is generally listed under the name of Hi/dridiiiciKi uiiliiiniKilit!:. 

 Strom., var. ciokerii, Swett, which has the green shadings of the typical form 

 replaced by yellow and has an intensely black, irregular median band, which 

 separates it at once from any other variety. It was described by Swett in Can. 

 Ent. XLII.. page 278, ]ylO, from specimens sent to Iiini by Mr. A, J, Croker, of this 

 City (Victoria, B.C.). 



The other one is Hiidriiniii'iia aiitiiiinialis. Strom., var. coliiiiibiata, Taylor (Can. 

 Ent. XXXVIII., page 399, 1900). It is easily distinguished by its much larger size 

 and its narrow mesial area, which is shaded with dark cinerous where the typical 

 species is while. 



There is also another species lilie cnliforniuta occurring here, and that is 

 Ilildriomena irala, Swett. These two species are separated chiefly by the length 

 of the palpi, which in irata is short, not exceedirg 1 nnu. in length, and is moderately 

 long in californiala, and also by the time of their emergence, irnta flying early in 

 lla.v. while ciiUforuiuta- does not appear until the end of .June. There is generall.v 

 a period of from six to seven weeks between them. 



l[]i-Jrioiiiciiu i-ilciiaiiu Swett, is another species which has in some cases been 

 labelled as ealifoniiata, but is easily distinguished by the wide black bar at the base 

 of the inner margin, and by its much larger size, my specimens being 35 mm. in 

 expanse. Its earl.v appearance would also separate, as it emerges towards the end 

 of JIarch, and is. I believe, the first species of this genus to appear. 



Itiidriomena spcciosata, Packard, which occurs here fairly plentifully, varies but 

 very little, but there is a distinct colour variety of it which is much scarcer, and 

 was first taken by the late Rev. G. W. Taylor at Departure Bay in 190S. It is a 

 very pretty variety, and differs from the normal sprciosata in having all the pea- 

 green areas of the typical form replaced by olive-brown. It was named H. spcciosaia. 

 Packard, var. toiilori, by Swett. who described it in Can, Ent. XLII., page 277. 1930. 



This concludes my remarks on the more variable species of this genu.s. There 

 are a few other species I would like to have touched upon, but lack of time prevents 

 me on this occasion. 



NOTES ON THE LIFE-HISTORIES OF BLOOD-SUCKING DIPTERA OF BRITISH 

 COLUMBIA, WITH SPECIAL REFERENCE TO THE TABANIDAE. 



I!v Sr.vMoi 1! 11ai>\vi:.\. I>.\'.Sci.. AiiAssiz. B.C. 



Mr. Chairman and Gentlemen. — First of all, I intend to give you a list nf the 

 species of Tabanidte which are known to me to occur in British Colunilda. I wish 

 to refer to the pioneer work of Mr. IJ. ^'. Harvey, who was the first to do any 

 systematic work on this important group of insects, and who published the first list 

 of species. Most of my collecting has been done on the Lower Eraser and on 

 ^■ancouver Island, and there are doubtless a number of up-country forms yet to 

 be recorded. The determinations of Harvey's specimens were made by Professor 

 nine, as were also some of my own. Others I sent to the British Jluseum. This 

 has led to a little confusion in one or two species. For instance. Professor Hine 

 names one of the species Tnbnniis hixiirtii-s. O. S. : whereas the authorities at the 

 British Museum refer to it as an Atiilotiis. Hine's Tabanus fratellus. Wills., the 

 British authorities name T. putulliis. Walk. Hine also gives priority to T. captoniK, 

 JIartin. over T. coiiiii.stc'i. Wills. 



I shall now give you a list which Mr. Harvey gave me of the Tabanidte in his 

 collection. I liave collected all these forms myself, and in addition have found three 

 more species which I am adding to his list. 



