NORTH AMERICAN NEUROPTERA. 233 



Three males, one from British America, high up, the otliers from 

 Victoria, Vancouver's Island. Abdomen 21-62 mm., hind wing 25- 

 27 mm. 



This species is near to rubicimda. 



All three males with labium entirely black. Abdomen a little covered with 

 whitish blue powder, on the under side only; segment 2 with a large i-ounded 

 yellowish dorsal spot; 3 yellow to the suture, and a narrower yellowish spot 

 beneath the suture; dorsal crest of 4 and 7 with a faint yellowish line (PI. x, 

 fig. 1). 



I have looked through my whole collection for the female, and I 

 believe that three females from Loon Lake, Colvillo Valley, State of 

 Washington, collected by myself July 23, 1882, belong to this spe- 

 cies. This locality is just as far off from Vancouver Island and 

 from the border of British America. I caught together with them 

 one 9 of intncta, very easily to be recognized by the vulva. 



9. — Abdomen 22 mm., hindwing 24 mm., pterostigma 2 mm. (a little longer 

 than in the % ). 



Labium, its lobes and labrum, black. Abdomen having segment 2 with a large, 

 round, yellow spot, sides below yellow ; segment 3 yellow to suture, and a smaller 

 spot after suture ; 4-7 with a narrow yellow dorsal band on the basal half of 

 crest. Appendages black. Vulva with two short approximated tubercles (PI. x, 

 fig. 22) (similar to L. rubicunda). Wings as in the male. 

 8. Lieueorliinia liudsouica Selys. 



\_Libelhda hudsonica Selys, Revue des Odonates, p. 53, 1850. 



Dlplax hudsonica Hagen, Syn. Neur. N. Am., p. 180, 1861. 



Leucorhinia hudsonica Hagen, Proc. Bost. Soc. Nat. Hist., xviii, 

 p. 78, 1875. 



Leucorhinia Ho.geni Calvert, Trans. Amer. Ent. Soc. xvii, p. 36, 

 pi. V, figs. 2, 3, 4, 10, 1890. Ent. News, I, p. 73, 1890.] 



Lake Winnipeg; Saskatchewan River and Ft. Resolution, Hudson 

 Bay Territory; Massachusetts; [Pictou, Nova Scotia.] 



I have tried to make a thorough study of hudsonica and dubia. 

 Of the first, I have before me fourteen specimens, of the latter thirty- 

 seven. The size of both species varies. 



The specimens of dubia are usually larger, except one female from 

 Braunsberg, East Prussia, whose hindwing is 22 ram. long. Hud- 

 sonica has the hindwing 20-24 mm., abdomen 20 mm. 



At first I thought that the form of the valves of the female, 

 " presque quadrangulaires, rapproches," in diihia was deciding; but 

 a careful study of the seventeen females shows a remarkable differ- 

 ence in dead, dry specimens. I have never had more than one live 

 specimen in my hands and it was somewhat young. It is the same 

 which I have figured and described, and it is still before me. It is 

 from Gilgenau, East Prussia (PI. x, fig. 19A), and it agrees with my 



TRANS. AM. ENT. SOC. XVII. (30) JULY. 1890. 



