784 Wisconsin Academy of Sciences, Arts, and Letters. 
final arrangement of the sperm it was impossible to determine 
from the single specimen in which this was shown. 
At the anterior end of the vagina there is a dorsal outgrowth 
with two somewhat lateral prolongations, all of which forms 
the bursa copulatrix (figs, 47 and 48, Br. C). In Libellula 
the copul atory pouch does not form as distinct a body as in 
many other insects. 
Zoological Laboratory, 
University of Wisconsin. 
April, 1912. 
BIBLIOGRAPHY 
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