THE CANADIAN ENTOMOLOGIST 177 



this number no less than 13 species were captured on one oc- 

 casion only. Ten of these are represented by single specimens 

 the other three by two each. Of two others {vide infra) nymphs 

 have been found but no adults. 



The ten species represented by single specimens include, be- 

 sides the species of /Eshna already mentioned, Epiceschna heros 

 Fab., d!, with a l)roken wing, found floating on the lake; Boyeria 

 vinosa Say, 9 , found ovipositing; Didymops transversa Say, 9 ; 

 Erythemis simplicicollis Selys, 9 ; Lihellida luctuosa Drun.', cf ; 

 Sympetrum scoticum Donov., young cf ; and Hagenius hrevistylus 

 Selys., exuvia. A specimen apparently of the last-named species 

 was also seen floating on the lake, from a sailboat. The three 

 other species are: — Tetragoneuria canis Maclachlan, 2 cfs taken 

 within a few minutes of each other at Wilson's Creek; Coenagrion 

 resolutum Hag., a pair in copula from the same locality, a.nd JEshna 

 eremita Scudd., 2 cfs as already mentioned. Some of these 

 species evidently breed here occasionally or permanently in small 

 numbers, while others are doubtless strays from other localities. 



The two species as yet found only in the larval state are 

 Chromagrion conditum and Cordidegaster sp., both of which were 

 noticed for the first time in 1916. The nymphs of the former were 

 taken from the upper part of Whitefish Creek on Sept. 10. I have 

 never seen the adults in this vicinity but it is quite possible that 

 I have overlooked it, if restricted to this spot. As to Cordidegaster, 

 I have been searching for this elusive creature ever since my in- 

 terest in dragonflies began, but I have never yet seen a living 

 adult of any of the Eastern species that I can remember, though 

 fragments of a specimen of C. obliquus found in a box of remnants, 

 all apparently from De Grassi Pt., testify to my ha\ing once 

 taken a specimen of this genus here. Of its capture, however, I 

 have no recollection, and I had long given up hope of e\er finding 

 another Cordulegaster of any species in this locality. Imagine 

 then my surprise and delight when on Sept. 11, 1916, while pulling 

 up the masses of water-cress from a small brook (the upper part 

 of Wilson's Creek) I brought to light two full-grown nymphs of 

 the coveted genus. I continued the search and succeeded in get- 

 ting all I could carry home. Some of these are still alive, and I 

 hope to obtain adults from them during the coming season. 



