56 The Ottawa Naturalist. [June 



31. BoYERiA grafiana, Williamsoii. 



Ottawa, 1 female (Harrington). 



A somewhat more robust insect than B. vinosa; wings 

 hyahne with onlv a trace of the basal brown spots of vinosa 

 lateral thoracic spots pale blue, the first sometimes partly yellow- 

 ish; abdominal spots blue, larger than in vinosa-^ segments 9-10 

 of male greenish blue (in vinosa 10 is fulvous, 9 brownish) ; 

 appendages of female about as long as seg. 10. 



Family LIBELLULID.T.. 



Antecubitals of first and second series mostly coincident, 

 inner end of pterostigma not supported by an oblique vein. 



Sub-family CORDULIN.T>. 



Hind margin of eyes with a small tubercle, males with an 

 auricle (ear-like projection) on each side of seg. 2, and the anal 

 margin of the liind wing excavated. 



The Cordulinae generally exhibit metallic coloration to a 

 greater or less degree and the wings are seldom spotted beyond 

 the arculus. They are for the most part admirable fliers, and 

 are comparatiA'ely seldom seen at rest. 



In addition to the species here listed, the following may be 

 expected in the Ottawa district: Somatochlora elongata 

 (Scudder) Selys, 5. Williamsoni Walker, 5. Walshii (Scudder) 

 Selys, 5. 'jorcipata (Sciidder) Selys and Covdidia Shurtleffi Scudder 



Genus Didymops, Rambur. 



32. Didymops transversa (Say), Hagen. 



Ottawa, July 14th, 1899, 1 male (Gibson); July 9th, 1907, 

 1 female (Young); I male (Harrington); Meach Lake, Julv 21st, 

 1907, 1 female (Gibson). 



This species, the sole member of the genus, is fairly common 

 in wooded districts, flying along the margins of lakes and wood- 

 land streams, much after the msLnnev oi Basicr'schna janata with 

 which it is often associated. 



It is a dull brown, long-legged insect, readily recognized by 

 the single oblique yellowish band on the sides of the thorax and 

 the dull yellow basal spots upon the upper side of the abdomen. 

 These spots, however, are apt to disappear completely in dried 

 specimens. The abdomen of the male is distinctly club-shaped. 



Genus Macromia, Rambur. 



33. Macromia illinoiensis, Walsh. 

 Hull, June 29th, 1886, 1 male (Fletcher). 



A fine large dragonfly with clear or flavescent wings and a 

 slender abdomen, club-shaped in the male. Thorax dark 

 metallic green and blue, clothed with pale greyish hairs; a single 

 oblique yellow stripe on each side. Abdomen "dark brown, more 



