1908] Thp: Dragonflies of the Ottawa District. 55 



28. Aeshxa W. 



Meach Lake, July 21st, 1907, 1 female (Gibson). 



Anal triangle of male 2-celled, superior appendages of male 

 resembling those of JE. Y, but the apices usually rounded and 

 the denticles less conspicuous; a black line across the face; 

 lateral thoracic bands each divided into 2 spots. 



This species has also been quoted as .^ clepsydra. It seems 

 to be practically, restricted to the Boreal Zone east of the Great 

 Plains. 



Genus Epi.-eschna, Selys. 



29. Epi^schna heros (Fabricius) Hagen. 

 1 female, fragmentary (Maclaughlin). 



This immense Dragonfly is rather a rarity in Canada, 

 though commoner farther south. Its huge size (hind wing, 

 male 56, female 60 mm.), and the symmetrically forked sub- 

 nodal sector render it recognizable at a gl_ance. 



Genus Basl-eschna, Selys. 



30. Basi.eschxa JANATA (Say), Selys. 



Ottawa, June Uth, 1907, 1 female (Young); Clark's Bush, 

 May 2nd, 1902, 1 female (Gibson); Hull, July Uth, 1007, 1 male 

 (Gibson) . 



This insect closely resembles the Aeshncc, but the sub-nodal 

 sector is not forked at the apex. There are two straight oblique 

 yellow bands on each side of the thorax, a brown spot at the 

 base of each wing, and the abdomen is brown, spotted with 

 light bkie. 



It appears early in the spring and its season is about over 

 when the first Aeshnce are abroad. It frequents lakes and rivers, 

 flying up and dov.-n the edge of the shore in a regular beat. 



Genus Boyeria, MacLachlan. 



Our species are easily known by the 2 roundish spots on 

 the sides of the thorax and the dull brownish or greyish colora- 

 tion. 



Until recentlv, but one North American species has been 

 recognized, but Williamson has described a second very closely 

 allied form, B. grafiana, of which a specimen has been received 

 from Ottawa. B. vinosa (Say), MacLachlan, is also certain to 

 be met with there, as it is common everywhere in wooded 

 districts along the shores of lakes and streams. 



In B. vinosa the wings are brownish and there is a distinct 

 dark brown spot at the base of each ; the two round spots on the 

 sides of the thorax are yellow and tlie abdomen is brownish with 

 small obscure pale spots. The appendages of the female are 

 about H times the length of seg. 10. 



