ODONATA OF THE VICINITY OF GO HOME BAY 85 



SESSIONAL PAPER No. 39b 



along the edge of ponds and creeks, or at a height of twenty feet or more in sunny 

 openings in woods. 



The dates on which it has been observed in flight at Go Home Bay range 

 from July 21 (1907) to Aug. 26 (1912). 



The nymph of this species has been described by Needham ('01) under the 

 name S. elongata, Scudd. It has not been taken at Go Home Bay, but on Aug. 2, 

 1912, we found an exuvia belonging to this genus on a log at the mouth of a small 

 forest stream emptying into the Go Home River. A similar exuvia was taken 

 by Mr. Paul Hahn in Algonquin Park and erroneously recorded by the writer ('06) 

 as Cordvlia shurtleffi,. These exuviae agree with Needham's description, except 

 in the somewhat smaller size and narrower abdomen. Width of abdomen, however, 

 is a somewhat variable feature in exuviae, depending much on the state of contrac- 

 tion, and it seems most probable that these exuviae belong to S. williamsoni as this 

 is the only Somatochlora we have observed in the vicinity of Go Home Bay. 



They measure as follows (the smaller figures belonging to the Go Home speci- 

 men); Length of body 22-23; abdomen 13-15; hind femur 7-7-5; width of 

 abdomen 7 • 5-8. 



Libellulinae. 



Nannothemis bella (Uhler) Bi auer. 



This diminutive species is quite locally distributed but we have found one 

 station where it is extremely abundant. This is a small floating sphagnum bog 

 occupying a somewhat triangular space between two masses of rock on the edge 

 of a small lake near the mouth of Go Home Bay. Here, in company with Nehalen- 

 nia gracilis, Leucorrhinia frigida, Lestes disjunctus and some other less character- 

 istic forms, it flits about among the low vegetation, settling frequently on the 

 cotton grass, cassandra and other low plants that grow in the bog; the wings, 

 when at rest, being bent strongly ventrad on each side of the supporting stalk. 



We have not determined the time when this species begins to emerge. When 

 first observed in 1907 on June 28, most of the males were already pruinose, though 

 younger black individuals continued to appear for some time later. The latest 

 capture was made at the same bog on August 6, 1912, a single male having been 

 taken. 



Careful search was made for the nymph, but without success. One exuvia, 

 however, was found clinging to a cranberry twig, many feet back from the water's 

 edge. The nymph had evidently emerged from the bog itself, having lived like 

 Nehalennia gracilis in the water in which the sphagnum and other bog-plants 

 were partly immersed. The nymph has been described by Needham ('Ola). 



Celithemis elisa (Hagen) Walsh. 



This is a species of the marshes, which first makes its appearance on the wing 

 in the latter half of June and flies until about the end of August though our latest 



