76 MARINE AND FISHERIES 



5 GEORGE v., A. 1915 



away from the water. Like most species of Aeshna they often follow the shore- 

 line more or less closely while foraging around a bay or pond. 



Aeshna canadensis Walker. 



This is the most common Aeshna of the Go Home district and probably 

 of the entire Transition Zone in Ontario. It is also the earliest species to appear 

 on the wing, the period of emergence commencing about June 25th and usually 

 concluding before the middle of July. The adults fly until the middle of September 

 or even later. 



The nymphs (Walker, '12) are very similar to those of Ae. clepsydra and are 

 found under apparently precisely similar conditions. On July 29, 1908, a number 

 of half-grown nymphs of this species were found in a very shallow pool in the 

 sand on Giant's Tomb Island. This pool was close to a lagoon with which it had 

 been connected earlier in the season. The water was only a few inches deep 

 and had been heated by the sun to a temperature of perhaps 37° degrees C. The 

 nymphs were quite active but died the following night in the laboratory, not being 

 able to accommodate themselves to the rapid change of temperature following 

 their removal. 



Aeshna verticalis Hagen. 



This species is very scarce at Go Home Bay, only three specimens, two males 

 and a female, having been taken. These were captured by Dr. Huntsman on 

 August 26th and 30th, 1907. It is a common species southward, being not infre- 

 quently met with at Lake Simcoe and at times very numerous at Toronto. It 

 has also been taken more or less commonly in many of the Northern and Middle 

 States east of the Mississippi and has been recorded from Florida by Muttkowski 

 ('10). It is thus an Austral species. Go Home Bay being the most northerly 

 point from which it has been taken in Ontario. 



In habits it resembles the preceding species in the adult state, but first appears 

 as a rule nearly a month later and is commonest in the latter half of August and the 

 first half of September. 



Its nymph is still unknown. 



Aeshna tuberculifera Walker. 



This is an insect of which the habits are quite unknown. It is distributed 

 from New England to Wisconsin, but is apparently nowhere common. Only a 

 single male has been taken at Go Home Bay, by Dr. Huntsman, on August 26, 1907. 



Since the above was written this species has been reared by the writer on 

 Vancouver Island, B.C. The nymph will be described shortly in the Canadian 

 Entomologist. 



Aeshna umbrosa Walker. 



This appears to be the most widely distributed and abundant Aeshna in North 

 America. 



