1905 ENTOMOLOGICAL SOCIETY. 69 



sometimes alight on the canoe. Only one female wa3 taken, but quite a 

 number of males. 



19. Gomphus plagiatus, Selj^s. A nymphal skin was found on a muddy 

 part of tlie river shore just below a rapid. 



20. Bpyeria vinosa (Say). This was the most abundant of all the larger 

 dragonflies along the river, but was never seen away from the water. It was 

 most common on the smoother parts and had the curious habit of following 

 the canoe, sometimes hovering close to the gunwale. A few nymphal skins 

 were found by Mr. Hahn. 



21. zEschna constricta, Say. A male was taken on Little Joe Creek, 

 August 29, 1902, a pair from the North River, August 14, 1903, and a few 

 females at Dwight, August 23, 1903. Much less common than the next 

 species. 



22. j^schna clepsydra, Say. The commonest ^schna in this locality; 

 plentiful in openings in the coniferous woods, frequently settling on the 

 trunks and branches of the spruce trees and balsams. A female was taken 

 while ovipositing. She was resting on the edge of the shore with the end of 

 the abdomen immersed in the water among a few aquatic plants. 



23. zEschna verticalis, Hagen. Associated with the preceding, but 

 apparently less numerous. A number of ^schna exuviae were found by 

 Mr. Hahn, but it is not known to what species they belong. 



Libellulidse. — 



24. Macroraia Illinoiensis, Walsh. A nymphal skin was found by Mr. 

 Hahn. The imagoes were occasionally seen patrolling the river, but would 

 swoop past the canoe and disappear so quickly that it was quite useless to 

 attempt their capture. 



25. Didymops transversa (Say). A nymphal exuvia was found on the 

 rocky shore of Oxtongue Lake, some yards from the water. Several others 

 were found by Mr. Hahn along the river. 



26. NeurocorduJia (sp.). About a dozen exuviae were found upon the 

 side of a timber slide at the upper end of E-agged Lake, August 17, 1903, 

 They were mostly from two to four feet from the ground, of which there was 

 a narrow strip between the timber slide and the water. Another was found 

 by Mr. Hahn at Canoe Lake. 



Prof, Needham, to whom I sent one of the skins, says they do not belong 

 to N . obsoleta (Say), the only species of Neurocordulia which has been bred, 

 and may be N. Y amashanejisis (Pro.), which occurs in Quebec. 



27. Epicordulia princeps, Hagen, A single nymphal exuvia was found 

 by Mr. Hahn. 



28. Tetragoneuria semiaquea, Burm. One male taken by Prof. Ma- 

 coun, July 6, 1900. I found the exuviae in considerable numbers on the tim- 

 bers of a log hut at the lower end of Smoke Lake. The hut was built on the 

 shore of a shallow bay connected with the main body of the lake by a rather 

 narrow passage. The bay was full of pond-weed (Brasenia peltata), and 

 other aquatic plants and was doubtless a fine breeding-ground for Odonata. 

 Skins of HelocorduJia Uhleri and Gomphus exiJis were also found on the hut. 



29. Tetragoneuria cynosura (Say). Skins of this species, according to 

 the distinctions given by Prof. Needham, were also found. 



30. Tetragoneuria spinigera (Selys). Two exuvia of this genus with the 

 lateral spines of the ninth segment considerably more divergent than the 

 others probably belong here. 



31 Helocordulia Uhleri (Selys). Two exuviae taken from the log hut on 

 Smoke Lake and a number from Canoe Lake. 



