352 THE CANADIAN ENTOMOLOGIST. 



from this lot of nymphs and I naturally supposed that the others 

 were also of this species as they appeared to be all alike. But not 

 another ebrium emerged, all were hageni, and on returning a few 

 weeks later to the spot where the nymphs were taken it was found 

 to be swarming with Enallagmas, all of which, as far as I was able 

 to determine, were hageni. 



The nymph of ebrium appears to differ from that of hageni 

 only in the form of the lateral appendages of the male (pi. XXII, 

 figs. 4, 5). The shape of the head, parts of the labium, gills, etc., 

 are all precisely as in hageni. In the single exuvia I have there 

 are three mental setae and a rudimentary fourth and six lateral 

 setae on each side; the distal margin of the lateral lobes of the 

 labium bears three teeth of medium size, preceded by 3 or 4 very 

 minute crenulations. 



The lateral appendages seen in profile are bluntly rounded 

 and about as deep as long; seen from above they appear much 

 narrower than in hageni, especially distally, and the supero-internal 

 surface is distinctly though shallowly and obliquely sulcate. 



Length of body (without gills) 14.5; outer wing-pad 4.5; gills 

 6.8; hind femur 3.6. 



Enallagma geminatum Kellicott. 



I have bred a single female of this species, the nymph of 

 which was taken in Grenadier Pond, Toronto, and transformed on 

 July 2, 1914. In form it resembles the preceding two species but 

 differs in the slenderer, unspotted gills and the less conspicuous 

 spinules of the lateral margins of the abdominal segments which 

 form a single series terminating in a pair at the postero-lateral 

 angles. (Fig. 32, b.) In this respect it approaches Coenagrion 

 resolutum. 



The ovipositor is relatively longer than in E. hageni, nearly 

 reaching the postero-ventral margin of segment 10, the apices of 

 the valves just reaching this margin. 



Labium with 3 mental setae on each side and an additional 

 rudiment on one side (4, occasionally 3, according to Needham) ; 

 lateral setae 5. Distal margin of lateral lobes with 3 rather large 

 teeth preceded by a very short and indistinctly denticulated 

 margin. 



