tabanidae from camden haven district, 829 



Seasonal Distribution. 



A table has been constructed to show the weekly records of 

 capture of all the various species found in the locality. Of 

 necessity it is restricted to the months when work was being- 

 carried on at Kendall; these however, comprised the summer 

 practically from the end of November to the end of March. 

 Records for the end of 1917 are very meagre, 2 specimens of 

 Erephopsis gibbula on 30th October and one each of T. san- 

 guinarius and T. kendallensis on 4th November. Records for 

 1918 show that November and December are favourable months 

 for the appearance of many species; in 1917, however, these 

 months were very wet and no tlies were about, though they 

 were searched for. In January, 1919, no collecting was done, 

 and as in 1917 work was only commenced during this month, 

 and the records for January are practically confined to 1918. 



Study of these records shows that while certain species were 

 equally common during the November-December and January- 

 March periods, as, for instance, E. guttata, E. concolor, T. parvi- 

 callosus and T. circumdatus, in other cases the seasonal inci- 

 dence is much more marked. Thus the following species were 

 almost restricted to the November-December period — E. quad- 

 rimaeula and E. contigua, D. auriflua, D. abdominalis and Sil- 

 via* In rid as. In still further eases the numbers taken during 

 January to March greatly predominate, such are — D. inflata, 

 T. macquarti and T. innotatus. In many species the number of 

 specimens obtained was so small as to make any deductions im- 

 possible. It seems possible that in these instances we were 

 dealing' with flies which had their headquarters elsewhere and 

 were only of exceptional occurrence in the Kendall District — 

 D. brevirostris is a good instance, as we know it to be common 

 in certain areas — the Blue Mountains, New England and the 

 Clarence River — while only 13 specimens have been taken at 

 Kendall; it is probably a mountain species wandering occasion- 

 ally down to the coast. The Camden Haven district seems near 

 the meeting point of the northern and southern forms of Taba- 

 nidae, both being almost equally represented . As Southern 

 forms may be cited all the Pangoninae represented, excepting 

 Silvius, and possibly Caenoprosopon and the hairy-eyed group 

 {Tlierioplectes) of the genus Tabanus. As Northern forms, all 

 the species of Tabanus not belonging to the section Tlierioplectes 

 and the genus Silvius. D. testacea is a northern species in that 



