ODONATA OF THE VICINITY OF GO HOME BAY 69 



SESSIONAL PAPER No. 39b 



where it frequents the marshier parts of the shore, but, like the preceding species, 

 does not usually fly among the reeds and sedge of the marshes., but over the lily- 

 pads and pond-weed, keeping so close to the water that it is very difficult to net. 

 It may also be found in the more open reed-beds, where it is more easily captured. 



Among the nymphs taken by Mr. Wodehouse at Waubaushene and Fitz- 

 william Island are a number of specimens of an undescribed form, which is so un- 

 mistakably nearly related to E. signatum that we have little hesitation in ascribing 

 it E. pollutum. This species is, moreover, the only Enallagma of the region except 

 the rare E. ehrium, whose nymph has not been reared.* 



Nymph (Figs. 9, 10); — Long and slender; eyes very prominent laterally, 

 their postero-lateral margins forming with the sides of the head a distinct excava- 

 tion. Hind angles of head with numerous slender setse, rounded but very promi- 

 nent and narrower than the median concavity. Abdominal segments 2-7 wtth 

 prominent postero-lateral angles. Gills large, broad lanceolate, widest at the dis- 

 tal third, with a transverse median joint, basal half dark except at the base, apical 

 half whitish or grey except a broad dark anteapical band. 



Labium with 3 mental setse; lateral setae 5; lateral lobes, before the end-hook, 

 with three well-marked teeth, preceded by a feebly denticulate, almost truncate 

 margin. 



Colour brown (alcoholic, probably greenish in life), sides of head and thorax 

 with a pale longitudinal band between two dark bands, the most ventral of which 

 passes dorso-caudad to the bases of the front wing-cases. There are usually also 

 a few dark spots on the head and thorax. Abdomen rather dark brown, almost 

 uniform. Legs pale, femora with a very narrow but usually well-defined dark 

 ring at the distal fourth. 



Length of body 13 (contracted) to 18 (extended); gills 5-6 '5; hind wing 

 4-3-5; hind femur 3-5; width of head 5-23-3-4. 



21. Ischnura verticalis (Say) Selys. 



This ubiquitous species is not particularly abundant at Go Home Bay. It 

 is the second species of damsel-fly to appear in the spring, being preceded only 

 hy Enallagma calverti. We found them in considerable numbers on June 1, 1912, 

 on the marsh at the outer end of Galbraith Lake, where they were transforming. 

 Nearly all the individuals seen were tenerals, while E. calverti was for the most 

 part fully mature. 



This species seemed to become scarcer in July, but many fresh adults appeared 

 in August. In this district, /. verticalis is more frequently met with about the 

 margins of sluggish creeks than in the marshy bays. We have not observed it in 

 sphagnum bogs. 



The nymph has been described and figured by Needham ('03). 



* Since the above was written I have reared E. ehrium at Toronto. The nymph is described 

 in Can. Ent., 46, Oct. 1914. 



