ODONATA OF THE VICINITY OF GO HOME BAY 77 



SESSIONAL PAPER No. 39b 



It differs decidedly from the other species of the genus, the habits of which 

 are known, in that the nymph develops in small woodland creeks, ditches and 

 spring-fed pools, never being found in open, weed-grown, marshy waters. The 

 imago is also decidedly partial to somewhat shady localities and flies as readily 

 during dull as bright weather. It flies habitually until late dusk, coursing up 

 and down the ditches or creeks in which it breeds, or foraging in open spaces 

 away from the water, in search of Diptera and other small insects. 



On account of this type of habitat Ae. umhrosa is not very common about 

 Go Home Bay. A few full-grown nymphs were taken during August in two 

 small shady creeks, emptying into Go Home Bay and on June 10, 1912, two other 

 grown nymphs were taken from beneath boulders in the short outlet of a small 

 lake. These were thickly covered with brown hydras. One of them emerged 

 on July 14th. The nymph has been described by the writer ('12a). 



The imagos were not seen very often, but are by no means rare. A single 

 female was taken on the Station Island, where it must have flown from the main- 

 land or one of the larger islands. 



Anax Junius (Drury) Selys. 



This common and widespread species was the first dragonfly to be seen in flight 

 after our arrival at the Station in 1912, a single individual having been observed 

 on the Giant's Tomb Island on May 26. On June 1 a considerable number were 

 seen flying about the inner end of Galbraith Lake. Several couples were observed, 

 but none actually in copula, the males adhering only by the abdominal appendages. 

 The female of one of these couples was observed ovipositing on the under surface 

 of water-lily pads. She remained only a few seconds at each lily-pad. A similar 

 pair was seen at Muskoka Mills on June 31, and the male captured. 



Two stragglers were taken on the Station Island, a female in good condition 

 on June 26, '12, and a worn male on July 7. This is the latest date on which 

 an adult of the spring brood was observed. 



The nymphs are taken quite frequently with the hand-dredge and dip-net, 

 along the marshy borders of ponds and sheltered bays, their haunts being quite 

 similar to those of Aeshna canadensis and clepsydra. 



They are not nearly so abundant here as in the vicinity of Toronto and south- 

 ward. 



No individuals of the fall brood had yet made their appearance at the time 

 the Station was closed in 1912 (Sept. 11). 



Nasiaeschna pentacantha (Rambur) Selys. 



On August 28, 1906, Mr. W. J. Fraser found three of the strange-looking 

 nymphs of this interesting species near Bala Falls, Muskoka, Ont. He attempted 

 to rear them, but although easily kept in captivity they were all killed by accident. 

 One of them was kept through the winter and brought to the station at Go Home 

 Bay in 1907, but on crawling out of the breeding jar, probably to transform, it 

 was accidentally crushed. 



