MICHIGAN ACADEMY OF SCIENCE. 
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15. Gomphus scudderi Selys. — One male only; taken July 25. 
10. Gomphus ventricosus Walsh. — One male only; taken July 21. 
IT. Dromogomphms spinous Selys— Common everywhere all sum- 
mer. Exuviae found in great numbers on the shore of Burt Lake, where 
they were seen emerging, June 21, by Dr. Pearse. 
18. Hagenius brevistylus Selys. — Common everywhere all summer; 
often seen far out on the lake. One was seen to emerge from the 
nymphal skin on June 21 by Dr. Pearse. 
19. Boyeria vinosa Say.— Several specimens of both sexes were taken 
and always in camp although Killicott says they prefer seclusion. July 
30 to August 30. 
20. Anax junius Drury. — A few nymphs of various ages were taken 
but no adults. 
21. Aeschna canadensis Walker. — Six males and four females were 
taken and others seen, July 21 to August 20. One was seen August 20, 
laying eggs on the moist wood of the dock. 
22. Aesclum interrupt a Walker. — One taken, August IS. 
23. Macromia illinoiensis Walsh. — One adult taken and a nymph 
found in the sand and scanty vegetation in eighteen inches of water. 
A single exuvia was found on the shore of Burt Lake. 
Nymphs of the Zygoptera were found at various times but no effort was 
made to identify them. 
April, 1911. 
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