146 The Ohio Naturalist. [Vol. VII, No. 7, 



these pools. They were visible onlv when seen against the water 

 and not always then. As long as sufficient light remained to 

 catch glimpses of thein they were still on the wing in apparently 

 undiminished numbers. I succeeded in taking only eight spec- 

 imens. One of these was Boyeria vinosa. The others were 

 Aeshnas — W, Y, and Z. All eight were males. 



20. Aeshna X. Heyden, July 30 and 31st, and Aug. 2d, 3d 

 and 4th. Searchmont, Aug. 1 and 7th. Twenty-one males and 

 four females. Most of this material was taken at Stony Lake. 

 Only two specimens wxre taken at Searchmont. This w^as to be 

 expected since, as stated above, all the collecting I did at lakes 

 was done in the vicinity of Heyden, while at Searchmont rapid 

 streams were followed, along whose courses Aeshnas and others 

 such as Leucorhinias, could be expected only as accidental 

 visitors. 



21. Aeshna Y. Heyden, July 30th, and Aug. 3d and 4th. 

 Searchmont, Aug. 1 and 9th, Oden, Michigan, Aug. 11th and 

 12th, and Aug. 24th, (J. H. Williamson). Twenty-seven males 

 and two females. Nineteen of these males wxre taken at Oden. 

 Aeshna X was not seen at Oden at all. Aeshna Y was rare 

 about Heyden, but, associated with a few Aeshna Z, it made up 

 the entire Aeshna fauna, so far as I could determine, at Oden on 

 the dates I was there. 



22. Aeshna Z. Heyden, July 30th and Aug. 2, 3 and 4th. 

 Searchmont, Aug. 6th; Oden, Michigan, Aug. 11th and 15th 

 (J. H. Williamson). Twenty males and two females. This is the 

 only Aeshna known to me which prefers woodland pools, quiet, 

 grass-grown and much shaded streams, and early morning and 

 late afternoon for its greatest activity. Of course it may be 

 taken under other conditions but under these the most individ-. 

 uals are seen and taken. The species was the one usually taken 

 along Root River. Two individuals were taken at Searchmont 

 and three at Oden. Three females Aeshnas taken at Oden are 

 not listed in the above discussion. These were taken Aug. 11th 

 and Aug. 23d and Sept. 3d (J. H. Williamson). 



23. Somatochlora elongata Scudder. Heyden, July 30th and 

 31st, and Aug. 2 and 3d. Seventeen males. When not hawking 

 at a considerable elevation this species was readily taken. I 

 believe the Somatcohloras possibly enjoy a reputation for more 

 powerful flight than they really possess. A wary dragonfly with 

 just sufficient powers of flight to maintain itself in the air at an 

 elevation beyond the reach of the collector would be difficult to 

 capture. Moreover, if it were rare and seldom met with, the col- 

 lector's anxiety to capture every specimen seen would tend to 

 magnify his opinion of its powers. In the case of S. elongata the 

 flight is not as sustained as that of the Aeshnas, it is less adept at 

 dodging the collector's net, and it lacks the dash and mobility of 



