THE CANADIAN ENTOMOLOGIST. 197 



Mental setae 6 on each side; lateral setae 3 + 1 small one on 

 the lateral edge of each lateral lobe, just proximal to the arti- 

 culation of the movable hook. Lateral spines on abdominal 

 segments 5-9, smallest on 5. Spinules on lateral carina of segment 

 9, 14 on right side, 12 on left. Length of body, without gills, 

 17 mm.; mentum of labium 3.8 mm.; outer wing-pads 5.5 mm.; 

 hind femur 5 mm.; gills 9 mm. 



In Professor Needham's material these characters are quite 

 similar to the above, in so far as they are represented, except 

 that one of the labia is larger than the others, measuring 5 mm. in 

 length, whereas the others measure barely 4 mm. or a little less. 

 One of the latter is labelled "bred." In all the specimens there 

 are 3 lateral setae and 5-6 mental setae on each side. The rudi- 

 mentary seta mentioned by Professor Calvert is present in all the 

 specimens and in fact is rarely absent in any of the species of 

 Lestes I have examined. In the exuvia from Professor Needham, 

 there are lateral spines on abdominal segments 5-9, and the lateral 

 carinae of segment 9 bear 13-14 spinules. 



In all these characters and also in the form of the labium 

 and its lateral lobes, there is nothing to distinguish the nymph of 

 this species from that of L. rectangularis, but the ovipositor will 

 probably prove to be much larger, resembling that of L. uncatus, 

 since these relations obtain in the adult. 



Lestes rectangularis Say. 



I have bred this species at Toronto and have a large number 

 of full-grown nymphs taken by Mr. Wodehouse from a pond on 

 Fitzwilliam Island, Georgian Bay, in company with L. uncatus. 

 I also have exuviae and adults reared by Professor Needham and 

 a number of nymphs taken by him at Old Forge, N.Y. 



Nymph. — Somewhat smaller than that of L. uncatus, and of 

 somewhat slenderer build. Labium of moderate length, generally 

 reaching back to about the middle of the hind coxae, but some- 

 times not quite reaching their bases while in two specimens, 

 otherwise like this species, it extends a little beyond the apices 

 of the coxae. In none of the four exuviae of bred specimens that 

 I have does it extend beyond the base of the coxae. The slender 

 proximal part of the mentum is about 1.25 to 1.5 times as long as 



