346 ZOOLOGY: 
insects with a thin cylindrical abdomen, but an enormous 
head and thorax. Many of them are strikingly beautiful. 
The generative organs of the male open on the ninth abdominal 
segment, but there is a kind of vesicula seminalis on the second 
Fic. 196. 
C. The whole body extricated. 
D. The perfect Insect (Aeschna cyanea), the wings having acquired their full 
dimensions, resting to dry itself, preparatory to the wings being horizontally ex- 
tended. 
segment of the abdomen, into which the semen is transferred, 
and is thence introduced into the females. In some species 
the female then flies over the water, touching it at intervals 
