78 MARINE AND FISHERIES 



5 GEORGE v., A. 1915 



Two nymphs were found at Go Home Bay during 1907. One of these I found 

 clinging to my paddle while passing through the outlet of Galbraith Lake. The other 

 was dredged from among the reeds along the edge of the "Sand Run," a shallow, 

 sand-bottomed channel in which a more or less distinct current is usually perceptible. 

 Following both of these captures, prolonged search was made for more specimens, 

 but without success. These two nymphs were kept alive until late in the winter 

 of 1908, one of them, in the meantime, having reached the final stage, but on one 

 unusually cold, windy night, the water in the breeding-jar, though inside the 

 room, froze solid, and the nymphs were killed. 



The only other nymph we have seen was taken by Mr. Wodehouse in a marshy 

 bay near Waubaushene, June 1912. 



The full-grown nymphs measure as follows : 



Length of body 48; mentum of labium 7«3-7-5; hind wing case 10-10-5; 

 hind femur 6 • 5 ; width of head 8-59. 



The only adult taken in the vicinity of Go Home Bay was a fine male, captured 

 by the writer, while flying over the marshy outlet of a small stream at the inner 

 end of one of the sheltered bays. A colour sketch was made of this specimen, 

 as the colours of the living insect seem not to have been recorded. The face was 

 light grey with a slightly bluish tinge, deepening to dark brown on the frons next 

 to the eyes. Frontal vesicle and occiput whitish, eyes brilliant blue. Thorax 

 rather light reddish brown, the pale markings grass-green. Abdomen dull greenish 

 black, the paler areas dull green of a somewhat bluish shade. 



Go Home Bay is the most northerly locality from which this species has been 

 obtained. It is an Austral species, being distributed as -far south and west as 

 Florida and Texas. 



Libellulidae. 



Corduliinae. 



Didymops transversa (Say) Hagen. 



With the exception of Anax Junius this species, together with Tetragoneuria 

 spinigera and Gomphus spicatus, is the earliest dragonfly of the sub-order Anisop- 

 tera to appear in the spring. The first exuvia was found on the shore of one of the 

 inner channels on May 29, 1912. A specimen emerged in the laboratory on June 

 12, 1912, and in 1907 one was found emerging on June 16, the day after the Station 

 was opened. The latest date of emergence we have recorded is June 19, 1907. 



The time of flight of this species seems to be unusually short, as none have 

 been seen at large after June 21. The males patrol the margins of lakes and bays, 

 resembling Basiaeschna on the wing, but flying more swiftly. The females are 

 apparently secretive and are seldom seen. 



The nymphs are found sprawling on the sand near the shore in clear, well- 

 aerated water. They are not rare about the Station Island, where the imagoes 

 have also been occasionally taken just after transforming. The nymphs sometimes 



