136 ENTOMOLOGICAL NEWS. [April, '06 



Leucorhinia hudsonica Selys. Bay of Islands, July 7, 1901, 

 4 $ and 4 9 . 



Sympetrum costiferum Hagen. A single 9 , badly damaged, 

 from Bay of Islands, July 7, 1901, apparently belongs to this 

 species. 



Libellula quadrimaculata E. Bay of Islands, July 7, 1901, 



1 9- 



Notes on some species of Somatochlora. Somatochlora semicir- 

 cularis, septe?itrio?ialis , artica and forcipaia are a group of 

 closely related species with long slender abdomens and rela- 

 tively short wings. The difficulty in determining Dr. Atkin- 

 son's single $ of this group led to a study of these four species. 

 Oi forcipata I have seen but two specimens, the headless speci- 

 men, collected by Dr. Atkinson, and a male in the Harvey col- 

 lection, S. Lagrange, June 28, 1898, F. L. Harvey, collector. 

 The abdominal appendages of the Maine specimen seen in 

 profile, are much more strongly arched than in the Newfound- 

 land specimen. I have obtained from Mr. R. C. Osburn the 

 specimen mentioned by him as forcipata, in Ent. News, June, 

 1905, p. 191,* from Port Renfew, British Columbia. I refer 

 this specimen to semicircularis. I am able to separate semicir- 

 cularis and forcipata only by the abdominal appendages of the 

 male. The Newfoundland forcipata is more slender than the 

 Maine semicircularis (a difference pointed out by De Selys for 

 the two species) , but the Maineforcipata is about as robust as the 

 two specimens of semicircularis which I have seen from that State 

 — the one figured and a second from Orono, Maine, July 16, 

 1 89 1, F. E. Harvey, collector, referred to in Ent. News, 

 May, 1892, p. 116, as forcipata. On the basis of this Orono 

 specimen, semicircularis can be added to the New England 

 fauna. Scudder's description of forcipata fits the two speci- 

 mens which I have referred to this species in the form of the 

 appendages and in the presence on abdominal segment 5 and 

 the two or three following segments of a distinct basal, lateral 

 small yellow spot. These spots are wanting in the single male 

 of septentrio?ialis I have seen and in semicircularis from Maine 



* In the same paper by Mr. Osburn, p. 192, he identifies two imperfect 9 of Sympetrum 

 as obtrusum. After a study of both specimens I believe they belong rather to palhpes. 



