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The Ohio Naturalist. 
[Vol. VII, No. 7 , 
these pools. They were visible only when seen against the water 
and not always then. As long as sufficient light remained to 
catch glimpses of them 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 were taken at Searchmont. This was 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 were 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. 0th; Oden, Michigan, Aug. 11th and 15th 
(J. H. Williamson). Twenty males and two females. This is the 
onlv 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 bevond 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 
