ODONATA OF THE VICINITY OF GO HOME BAY 87 



SESSIONAL PAPER No. 39b 



than in intacta, acuminate, about twice as long as the lateral appendages and one- 

 fourth shorter than the inferior appendages. Dorsal hooks on segs. 3-8, larger 

 on 3 and 4 than in intacta, less erect and more curved, very slender; those on 5-7 

 of about the same size as in intacta or somewhat larger and slightly more elevated, 

 the curve of the upper margins much stronger proximally. The apices sharp 

 and directed straight back, reaching about the middle of the following segment; 

 on 8 similar to those of the preceding segments, but less elevated, directed straight 

 back 



The coloration, when well marked, is so exactly similar to that of intacta 

 that it seems unnecessary to describe it. It is usually, however, rather obscure, 

 though the legs are always distinctly banded. 



Length of body 15-16; abdomen 9-10-6; hind wing 4-6-4'75; hind femur 4; 

 width of abdomen 6-6 -8; width of head 4 '7-4 '8. 



The chief characters by which the nymph of L. frigida differs from that of 

 intacta are thus the slightly smaller size, the more prominent eyes, the longer- 

 lateral spines on seg. 9, and the moie sharply curved dorsal abdominal hooks, 



Leucorrhinia proxima Calvert. 



A few specimens of this species were taken in a marsh at the mouth of a 

 small sluggish creek opening into Go Home Bay, on June 17, 1907. It is not 

 an uncommon species in Northern Ontario, but has not been recorded south of 

 Go Home Bay in this province. 



Its nymph is still unknown. 



Leucorrhinia hudsonica (Selys) Hagen. 



The adult of this northern species has not been found in this vicinity, but 

 a number of nymphs were taken in a small marshy inlet, which we have good 

 reason to ascribe to this form. These nymphs are identical with two exuviae 

 received from Prof. Needham and erroneously referred by him ('08) to L. frigida. 

 Two nearly identical exuviae were taken by the writer in June, 1913, at Nipigon, 

 Ont., where L. hudsonica was flying in abundance, and where no other species 

 was seen, except L. glacialis, whose nymph is known. These nymphs and exuviae 

 are too small for proxima and hudsonica is the only other regional species whose 

 nymph is unknown. One of the Nipigon specimens has small dorsal hooks on 

 segments 3, 5 and 6, the other has a single rudimentary hook on segment 4, while 

 the Go Home Bay specimens have no trace of dorsal hooks. In spite of these 

 somewhat marked variations it seems almost certain that all belong to one species 

 and that this species is L. hudsonica. 



Ten of these nymphs were collected at Go Home Bay, five of them being 

 full-grown. They were collected prior to our first visit to the Station and neither 

 date nor collector's name is known. 



