1907 ENTOMOLOGICAL SOCIETY. 47 



and tlie wide-spread Ischnura verticalis (Say), that familiar little green 

 and black species witli the blue-tipped abdomen; and two species of Tetra- 

 goneuria, the common seTniaquea (Burm.), and the larger and more north- 

 ern spinigera (Selys.). The former is common everywhere in southern 

 Ontario, but I have never seen them in anything like such large numbers 

 as they appeared at Go Home Bay, especially about the last week in June, 

 when on hot still days they positively swarmed in favorable spots. They 

 breed most abundantly in the little marshy coves along the shore, and here 

 the exuviae were sometimes so numerous that a single reed or grass stem 

 would bear half a dozen of them. 



Next day we went to the 'Chute,' a waterfall a short distance up the 

 river. Here two other dragon-flies not often taken by the ordinary collector 

 were found. These were Didymops transversa (Say), and Basiaeschna Jan- 

 ata (Say.). The former is a brown insect with clear wings, the abdomen 

 transversely banded with pale yellow and distinctly club-shaped in the male, 

 while the latter is closely related to the various members of the genus 

 Aeschna, those large dragon-flies with blue-spotted bodies that are so com- 

 mon in late summer. Both of these forms have the habit of following the 

 shores of the lakes and streams in a regular beat so that if one stations one's 

 self at some point along their course, one has a fair chance of capturing 

 them as they pass by sweeping the net at them from behind. 



The nj'mph transversa is a very curious spider-like creature with a 

 round abdomen and long sprawling legs which clambers about the rocks 

 along the shores of the bay and when ready to transform usually crawls 

 several yards at least from the water's edge. The only other Canadian 

 species allied to it also appeared at Go Home, but later in the season, namely 

 about July 4, when Didymops had already disappeared. The nymph of 

 this species {Macromia Illinoiensis, Walsh) closely resembles that of Didy- 

 mops but the imago is a much larger and finer insect, a splendid dragon- 

 fly, black with a conspicuous yellow spot on the upper side of the abdomen 

 and the sides of the thorax metallic green with an oblique yellow stripe. 

 It has also superb aerial powers and great patience and determination is 

 required to get many specimens. 



Towards the end of June new dragon-flies were constantly making their 

 appearance. On the Station Island, which lies partly well out toward the 

 open bay, three species of Gomphus appeared about this time, G. sordidus, 

 Selys., a large species, much resembling spicatifs but quite different in 

 habitat, appeared in great numbers, the nymphs crawling out from among 

 the boulders along the shore and transforming upon the rocks close to the 

 water's edge. In a few days the islands were covered with them but they 

 were very short-lived, the great majority having disappeared by the first 

 week in July. A few specimens also of G. hrevis (Selys.), a short thick-set 

 form, appeared about the same time but were found to be more character- 

 istic of the rapids of the river, while a few days after the first sordidus 

 emerged, G. exilis (Selys.), appeared, soon increasing greatly in number 

 and showing a much wider choice of habitat than either of the others. While 

 spicatus and sordidus were only accidentally found together, exilis was 

 commonly associated with both of them. The food of these Gomphines 

 seems to consist chiefly of May-flies, which are so abundant during their 

 Bcason of fliarht and which likewise disappear so suddenly. 



More interesting than any of these, however, was the discovery of 

 Neurocordulia yajnasJcanensis (Prov.), a species originally described from 

 Mount Yamaska, Quebec, by L'Abbe Provancher, but which has been 

 taken by very few collectors since then. Several years ago I obtained a 

 number of nymphs and exuviae, of a kind unfamiliar to me, in Algonquin 



