264 MICHIGAN SURVEY, 1908. 



'J'iirx-e nymphs skins were found at the margin of the sedge zone of 

 J^iimner Lake (III, 5j. (Jonipare Walker, 'OS, -who has examined the 

 isle Royale specimens. 



CorduUdae. 



Tetragoneuria spinigera Selys. One specimen was captured in a low 

 rock opening at the shore, near the head of Rock Harbor (near III, 2) 

 on July 14; and a female was taken, floating upon the water in the 

 west cove at the head of the Harbor (III, 6). The third specimen, a 

 female, was secured from a rock ridge near the head of the Harbor 

 near III, 2, July 21. (132.) 



Geographic Range. Maine; New Hampshire; Mass.; Georgia; Detroit, 

 Mich.; "^''ancouver Island. 



Cordulia shitrtlefft Scudd=aenca L. Three specimens, two males and 

 •one female, were taken at the edge of the water in the sedge zone on 

 IliH north side of Sumner Lake (III, 5) on July 29. (184, 78A.) 



Geographic Range. Nova: Scotia; Newfoundland; Ontario; Maine; 

 New Hampshire; Penn.; Saskatchewan; Fort Resolution; Mackenzie; 

 British Columbia; Alaska; Northern Asia; Europe; Algeria. 



Somatochlora, clongata minor Calvert. Only one male of this interest- 

 ing species was found, it was flying about the mouth of a small 

 stream at the head of Rock Harbor (III, 3) (165) on July 26. Of. 

 Culvert, Ent. News 1898, 9, p. ST. 



Geographic Range. Quebec; Maine; New Hampshire; Michigan; 

 Wyoming. 



LiheUulidae. 



C'clithcmis efonina Hagen. Nymphs only taken. Cf. Needham report. 



Geographic Range. United States east of the Rocky Mountains and 

 southern Canada (Ontario). 



Leiicorhinia hudsonica Selys. Three females were taken in the sedge 

 zone of a tamarack swamp (V, 5) on August 8. (96A). Syinpetrum 

 obtrusum occurred abundantly in the same locality. 



Geographic Range. Quebec ; Nova Scotia ; New Brunswick ; New- 

 foundland; Maine; New Hampshire; Mass.; Lake Winnipeg; Sask- 

 atchewan River; Fort Resolution, Mackenzie; Alberta; British Colum- 

 bia; Alaska. 



Leucorhinia proxima Calvert. Aboiit the margins of Sumner Lake 

 (III, 5) these dragonflies were very abundant on July 18, 24, and 

 29, and 19 males and 5 females were taken in the sedge zone. About the 

 lake this zone was quite extensive, as shown by 'the photographs. Most 

 :if our collecting of insects was done at the northeast end where, with 

 the aid of boots, an excellent swamp collecting ground was found. The 

 ground was very wet, and spongy, and treacherous in places, on account 

 <if these soft spots. This species also occurred abundantly about the 

 juargins of a similar pond near Siskowit Bay (V, 11), where it was 

 associated with l-Jiiallagiini hagciii. Acschiia and t-U/iniK'tnuii ruhicun- 

 diiliiin ohirusum. There is an interesting correlation between the geo- 

 graphic range of this genus and of its close ally Synipctrum (both are 

 primarily boreal, throughout both hemispheres) aiid the geographic de- 

 M'lopmcnl (iT those habitat conditions which they prefer. 



