60 MARINE AND FISHERIES 



5 GEORGE v., A. 1915 



also abundant here and all three species were still transforming. By this time 

 E. calverti, D. transversa and T. spinigera had about disappeared, though the last- 

 named species was taken in 1907 on July 1 and 4. All the other species mentioned 

 were common. During the last few days of the month several other species ap- 

 peared and speedily became abundant. These were Lestes disjunctus, Argia 

 putrida, Nannothemis bella, Libellula pulchella and Macromia ilUnoiensis. The 

 last-named species was first observed on the 30th and during the first few days 

 of July it came out in some numbers about the Station Island and neighbouring 

 parts. N. yamaskanenis could now be taken any evening in plenty. Tenerals 

 of Sympetrum obtrusum now began to appear and Enallagma pollutum was first 

 noticed about some of the marshy bays. It had probably, however, been on the 

 wing for some days as all the individuals seen were quite mature. The next species 

 to appear in 1907 was Dromogomphus spinosus which was first observed in trans- 

 formation on July 5. This species was not seen at all during 1912. On the 9th 

 Aeshna umbrosa emerged in the laboratory and on the same day Hagenius brevi- 

 stylus appeared on the Island, becoming common almost immediately afterwards. 

 On the 10th the first tenerals of Sympetrum costiferum and one of S. danae were 

 taken on the Giant's Tomb Island, but the former species did not appear at Go 

 Home Bay until the 24th, while danae does not occur there at all. Mature 

 specimens of S. corruptum, likewise absent from Go Home Bay were also taken 

 at the Tomb on this date. On July 14th the last Basiaeschna was taken 

 while the first Boyeria grafiana emerged in the laboratory, and about the same 

 time in 1907 the first specimens of Enallagma signatum were seen, though these 

 were not noticed until some time later in 1912. No other new forms appeared 

 imtil the 24th when Enallagma carunculatum was found about the Station Island, 

 most examples already mature, while Sympetrum semicinctum was added to the 

 species of marshy habitat. The predominant species about the Island were now 

 Argia putrida, E. carunculatum, Epicordulia princeps, and Hagenius brevistylus, 

 while those about the marshes were chiefly Lestes disjunctus and a few L. vigilax, 

 Enallagma hageni, Nehallenia gracilis, Libellula pulchella, Celithemis elisa, the 

 various species of Sympetrum and Leucorrhinia frigida, though the last had 

 become greatly reduced in numbers. On July 30, the first teneral of Sympetrum 

 vicinum was noticed and after this date no new forms appeared. The Gomphi 

 had practically gone and very few Macromia, Libellula exusta and Dorocordulia 

 were to be seen. Epicordulia princeps had also diminished greatly in numbers 

 and the last Tetragoneuria cynosura simulans, was taken on the 31st. By August 

 6th but little change could be noted. The Sympetrums were still emerging, most 

 of the individuals of S. costiferum and S. vicinum being still teneral. The Aeshnas 

 had apparently all emerged, though very few were seen in 1912. A single Nan- 

 nothemis was observed on this date. On Aug. 25 and 26 Sympetrum costiferum 

 and vicinum were abundant and a few S. obtrusum were seen. Many pairs were 

 observed in copula. Aeshna canadensis and clepsydra were also fairly common 

 and Somatochlora williamsoni was twice observed. Several Enallagmas were 

 also still abroad, viz., E. hageni, carunculatum, exsulans and pollutum. E. carun- 

 culatum was abundant along the shore of some of the bays and E. pollutum was 



