84 MARINE AND FISHERIES 



5 GEORGE v., A. 1915 

 Helocordulia uhleri (Selys) Needham. 



This is a very rare dragonfly in this vicinity, where it Jias been taken but twice, 

 both occasions on the Go Home River. The first capture was that of a male 

 on June 23rd, 1907, taken by Mr. W. J. Fraser at the ''Chute"; the other was a 

 female taken by Mr. W. A. Clemens on the river near Sandy Gray Falls. 



Cordulia shurtleffi Scudder. 



This boreal species, which is common at Nipigon and probably throughout 

 northern Ontario, is a rare insect in the Go Home Bay district, only a single imago 

 having been captured there. This was a male, taken by the writer on July 7, 

 1907, in the rocky woods close to the Go Home River, just above the "Chute." 



Of the nymph, which is described by Needham ('01), we have taken half a 

 dozen specimens, all from the bottom debris of swamp waters, particularly ponds 

 of little or no drainage. 



On account of this type of habitat they are very easy to keep alive in the 

 aquarium. Besides the nymphs from Go Home Bay one was taken from Mud 

 Lake, Midland, and another at Killarney, Ont., by Mr. Wodehouse. Only two 

 exuviae were found, one dated June 16, 1907; the other has no date attached. 



Dorocordulia libera (Selys) Needham. 



This beautiful insect is often to be seen coursing back and forth over open 

 marshes and sphagnum bogs, often following the course of a small stream or the 

 edge of a pond. It is also sometimes met with in openings in woods or along 

 their borders. It is usually seen moving rather slowly, but with rapidly vibrating 

 wings, the body slightly tilted with the end of the abdomen uppermost. When 

 approached it darts away swiftly, but if the collector be stationed on its regular 

 path of flight and strikes with the net from behind, it is not difficult to capture. 



The sexes occur in about equal numbers, but the females, being more retiring 

 and more often at rest, are somewhat less frequently taken. 



The few nymphs we have secured were found at the bottom of sphagnum- 

 bordered ponds and marshy bays, such as are frequented by the imagoes. 



The earliest date on which we have found the adult was June 18, 1907, and the 

 only freshly-emerged individual that we have taken was found with its exuvia 

 on June 27th of the same year. On June 28 they were quite numerous. Our latest 

 capture for the Go Home district was July 30, 1912, a single male having been 

 taken on this date, flying over a sphagnum bog on the edge of a large pond. 



Somatochlora williamsoni Walker. 



Like most of the Somatochloras this is a species of mainly boreal distribution, 

 though it is not uncommon at Lake Simcoe and has once been taken at Toronto. 

 It is not infrequently seen at Go Home Bay during August, flying rather low 



