66 THE ZOOLOGIST. 
gained, providing the insect kept straight on its way without any — 
curves, twists, or gyrations; these being counted in would add ~ 
considerably to the total just quoted. It seems strange that 
insects with such fully developed wings should, comparatively 
Some captives I had made no 
- speaking, use them so little. 
attempt at flight, but endeavoured to leave their prison by 
B qeertecees, 
ee 
oe? = 
2 
r) 
A how Pe 
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pe 
Diagrammatic sketch of swimming actions of Gyrinus. The dotted 
lines represent the various turns and twists executed while gyrat- 
ing. The arrow-heads denote the direction taken. When two 
beetles meet (as they frequently do) at a, a chase ensues, and the 
route then taken is indicated at B, c, D, and E, which ends in the 
characteristic twist, a complete circle, at F. 
crawling up the glass sides; nor do they attempt to fly when 
taken in the net and placed on dry ground, but run with far 
greater speed than one would expect of an insect gifted with such 
