168 THE CANADIAN ENTOMOLOGIST 



hooks wholly absent. Superior appendages triangular, slighth- 

 longer than its basal breadth, acuminate, apex slender-pointed: 

 lateral appendages scarcely longer, flattened, their basal breadth 

 nearly half that of the superior appendage, tapering to a point,, 

 outer margin gently curved; inferior appendage slender, slighth" 

 divergent, extending a little beyond the laterals. 



No trace of a colour-pattern is visible in the exuvia. 



Measurements. — Length of body 32; abdomen 13.5; hind 

 wing-case 6.3; hind femur 6.3; width of head 6; width of abdo- 

 men 8. 



The n>'mphs of this species difi^er from the other known 

 nymphs of this genus in the absence of any trace of dorsal hooks. 

 The head is much less narrowed behind the eyes, the postero- 

 lateral angles more prominent and angulate and the legs decidedly 

 shorter than in S. ivilliamsoni Walk, and 5. metaUica Vand., .the 

 only other species of this genus whose nymphs I possess. It differs- 

 in the same characters from the nymph of CordiiUa shurtleffi, to 

 which it bears a considerable resemblance. There seem to be no 

 very good generic characters for the separation of the nymphs of 

 Soniatochlora, Cordidia and Dorocordulia. 



Leiicorrhinia frigida Hagen. 



This species is exceedingly abundant in all swamp waters in 

 the Go Home Bay region, particularly in sphagnum-bogs. We 

 have found the nymphs in large numbers and have reared many 

 specimens. 



Needham's description* of the nymph of this dragonfly be- 

 longs to another species (probably L. proximo). In a letter to the 

 writer he stated that the species had not been reared, but that 

 tenerals of L. frigida had been found at the spot where the exuvia^ 

 were gathered. The nymph oi frigida, unlike Needham's species,, 

 possesses large dorsal hooks like the other species of Leucorrhinia 

 that have been reared. 



Nymph (Figs. 21-23) very similar to that of L. intacta, but 

 somewhat smaller and the legs slightly slenderer. Head similar 

 to that of intacta, except in the somewhat more prominent eyes; 

 Labium of similar size and form, the lateral lobes somewhat more 



*Bull. 24, New York State Museum, Ent. 23, p. 196, 1908. 



