THE CANADIAN ENTOMOLOGIST. 151 



This insect breeds in (Grenadier Pond, Toronto, but is not very 

 common. 1 found about a dozen exuvi;^ in a boatiiouse, and one attached 

 to a reed at the water's edge, and have occasionallv seen the imasfoes 



flying over the water. They seem to be quite tireless in flight. The 

 species is probably locally common in Ontario, as I have frequently seen 

 it in collections. There are many specimens in Dr. Brodie's collection, 

 but they are unlabelled. 



53. Tetragotieuria spin libera, Selys. — 1 have i fj, 2 9 9? ofthis 

 insect taken by Mr. J. I>. Williams at High Park, Toronto, May 24, 1902. 

 They are all tenerals Mr. Hahn has some exuvire from Algonquin Park, 

 which I believe belong to this species. 



54. Tetragoneuria cyjiosura, Say. — Toronto, June-July 14. 1904. 

 Algonquin Park, Aug., exuvi?e (?). 



55. Teiragoneuria seniiaquea, Burm. — Toronto, June, July ; De 

 Grassi Pt., July ; Go Home and Burwash Bay, Sept. 17, 1903, mature 



-nymphs; Algonquin Park, July 25, rgoo (Macoun), Aug., 1903 (exuviae). 



I have bred both cynosura and seniiaquea from nymphs taken from 

 Grenadier Pond, Toronto, and do not believe they can be separated by 

 the characters given by Needham. I am pretty well satisfied that they are 

 one and the same species. 



Seniiaqnea is much the commoner form wherever I have collected. 



56. Helocordiilia Uhleri, Selys. — Algonquin Park, Aug., 1903-4, a 

 number of exuviie, 



57. SomatocJilora elongata, Scudd. — Toronto, June ; De Grassi 

 Pt., June 29, 1901-July 19, 1904; Algonquin Park, Aug. 17-20, 1903. 



This species is abundant at Lake Simcoe and Algonquin Park, but is 

 very difficult to capture, as it usually flies at a height of twenty to forty 

 feet, seldom descending to within reach of the net. It frequents wood- 

 land roads and glades. I took one specimen inside the house at Toronto. 



The superior appendages of the male are more incurved in the 

 examples from Toronto and Lake Simcoe than in those from Algonquin 

 Park. 



58. Sofnatoc/i/ora /orcipata,?>c\\d6.. — Algonquin Park, July 15, 1900, 

 I <i (Macoun). 



59. SoniatocJilora tenebrosa, Say. — Hamilton (?), i $ (Anderson). 



60. Cordulia S/iurt/effi, 'icudd. — Algonquin Park, Aug. 11, 1904, r 

 exuvia (Hahn). 



61. DorocorduUa libera^ Selys. — De Grassi Pt., July, rare; Thessalon, 

 Algoma, I ^. 



