ODONATA OF THE VICINITY OF GO HOME BAY 6t7 



SESSIONAL PAPER No. 39b 



gins or rounded; across the middle of the gill is a distinct joint, proximad of which 

 the margins are spinulose, the spinules of the ventral margin stronger than those 

 of the dorsal; distad of the joint the margins are beset with a fringe of delicate 

 hairs, much longer than those of E. hageni. Colour dark brownish (probably 

 olivaceous in life), each abdominal segment except 10 with a dark lateral blotch, 

 not seen in the exuviae; femora with a pale ring just before the apex, preceded by 

 a dark ring. 



Length of body 15'5 (exuvia)-21'5; gill 6*5-8; outer wing-pad 4'5-5; hind 

 femur 4; width of head 3- 5-3* 7. 



I have also bred this species at DeGrassi Point, Lake Simcoe. 



15. Enallagma hageni (Walsh) Selys. 



Abundant about all still waters throughout the latter half of June and July 

 and in small numbers in August. They were first noticed about the middle of 

 June, and were common by about June 20. They thus begin to appear about 

 the time when E. calverti has nearly disappeared. On June 27 we found this species 

 in large numbers about a small pond on an island in the open waters of Georgian 

 Bay, about 3^ miles west of the Station Island. This island is largely bare rock 

 but supports a thick tangle of small cedars, red and black cherry and willows in 

 its middle part. The pond occupies a long narrow depression in the rock, emptying 

 by a very small trickle of water at one end. The shore and bottom of this pond 

 over the greater part of its area is bare rock, or rock covered with a thin deposit 

 chiefly consisting of decaying vegetable matter. At a few points along the margin 

 there are dense clumps of small reeds and at the western end, next to the outlet, 

 is a patch of cat-tails. Owing partly to its exposed and isolated position, 

 but few species of aquatic insects were found in this pond and these included 

 but three species of dragonflies. These were E. hageni, Ischnura verticalis and 

 Lihellula quadrimaculata. All of these, however, were very abundant and E. 

 hageni most of all. Some of the reeds were covered with their exuviae and trans- 

 forming nymphs. Most of the imagoes seen were more or less teneral, the season 

 being apparently a little later here than on the mainland and inner islands. I 

 also found this species in several other rock-pools on the outlying islands. It 

 was generally the only species of Odonata present. 



The nymph which has been described by Needham ('03) is exceedingly common 

 in all swamp waters in the vicinity of Go Home Bay. Numerous specimens were 

 also taken by Mr. Wodehouse at Matchedash Bay, Killarney and Fitzwilliam 

 Island, Georgian Bay. 



This species outnumbers all the other Enallagmas of the district taken together, 

 at least twenty times. 



16. Enallagma ebrium (Hagen) Selys. 



A single specimen, a male, was taken near a small lake close to the mouth of 

 Go Home Bay on June 20, 1907. This species is indistinguishable from E. hageni 



39b— 5h II 



