102 THE CANADIA^f ENTOMOLOGIST. 



Length of body 8.25-9; gills 3-3.75 additional; hind wing- 

 case 2.2-2.7; hind femur 2-2.33; width of head 2.33-2-4. 



Enallagma cyathigerum calverti (Morse) 

 Full-grown nymphs were taken early in the season of 1912, 

 several emerging in the laboratory on June 3 and 4. Mature 

 adults were flying in numbers on June 1, and had about disap- 

 peared by the middle of the month. Nymphs were also reared at 

 Lake Simcoc in 1909, adults emerging on June 4. 



The nymph (Figs. 4, 5) is very similar in form to that of E. 

 hageni (Walsh), but is considerably larger, with much darker gills. 

 Eyes as in hageni, less prominent than in E. signatiim and E. pol- 

 lutuni (Figs. 6, 7, 9), the curve of the posterior median excavation 

 somewhat more flattened than that of the rather strongly convex 

 margins on each side, the latter with a dozen or more spinules. 

 Labium with 4 mental seta? and 6 (occasionally 5) lateral setcc; 

 end-hook of lateral lobe preceded by 3 teeth of moderate size, which 

 are preceded by 3 or 4 smaller, somewhat incurved denticles. Gills 

 lanceolate, widest a little beyond the middle, ventral margin 

 straight at base, dorsal margin convexly curved; apices bluntly 

 pointed, with convexly curved margins or rounded. Across the 

 middle of the gill is a distinct joint, proximad of which the margins 

 are spinulose, the spinules of the ventral margin stronger than 

 those of the dorsal; distad of the joint the margins are beset with 

 a fringe of delicate hairs, much longer than those of E. hageni. 

 Color dark brownish (probably olivaceous in life, each abdominal 

 segment, except 10, with a dark lateral blotch, not seen in the 

 exuviae; femora with a pale ring just before the apex, preceded by 

 a dark ring. Gills dark greyish brown, deepening just beyond 

 the median joint. 



Length of body, 15.5(exuvia)-21.5; gills 6.5-8; hind wing 

 4.5-5; hind femur 4; width of head 3.5-3.7. 



Enallagma polliitiim (Hagen) Selys. 



Among a number of Odonate nymphs, taken by Mr. R. P. 

 Wodehouse at Waubaushene and Fitzwilliam Island, Georgian 

 Bay. in 1912, are numerous specimens of an undescribed form, 

 which is so obviously nearly related to E. signatiim that we have 

 little hesitation in ascribing it to E. pollutum. This species is, 



