THE CANADIAN ENTOMOLOGIST 349 



NEW AND LITTLE-KNOWN NYMPHS OF CANADIAN 



ODONATA. 



BY E. M. WALKER, TORONTO, ONT. 



Lestes unguiculatus Hagen. 



Owing to the lack of material this species was very imperfect- 

 ly described in my recent paper* on the nymphs of Lestes and w r as 

 not included in the key. Since then I have reared a female imago 

 from a nymph found in an artificial pond close to my house in 

 Wychwood Park, Toronto. I also found another female exuvia. 

 Adults of both sexes were common here and were the only species 

 of Lestes present. The reared specimen emerged on July 12, at 

 about 7.30 a.m. 



In general appearance the nymph is quite similar to that of 

 rectangularis with which it agrees closely in the form and size of 

 the men turn of the labium and the ovipositor. In my key it runs 

 to rectangularis and the following alterations may be made in the 

 key to include both species. 



DD. Mentum of labium 3.7-4.2 mm. long, rarely reaching beyond 

 middle of hind coxae; ovipositor just reaching apical margin 

 of segment 10. 



F. Inner part of lateral lobes of labium about three 

 times as long as their middle breadth, the marginal 

 teeth about as broad as long, truncated ; teeth of 

 middle lobe broader than long, rounded; mental 



setae 6 or 7 unguiculatus . 



FF. Inner part of lateral lobes of labium about four times 

 as long as their middle breadth, the marginal teeth 

 longer than broad, more or less apically rounded; 

 teeth of middle lobe about as long as their basal 

 breadth; mental setae normally five, .rectangularis. 



Nymph. — Labium, when closely applied to ventral surface, 

 extending caudad not quite to the base of the hind coxae. The 

 slender proximal part of the mentum is about 1.5 times as long as 

 the expanded distal part and just before the latter it is narrowed 

 to about one-sixth of the distal breadth, widening proximad to 



*Can. Ent., XLVI, No. 6, p. 194. 

 October, 1914. 



