536 



HEMIPTERA. 



the first object at hand, and undergo their transformations 

 in the usual manner." (American Entomologist, p. G-i.) 



The ovipositor of Cicada, as we have observed it in a rudi- 

 mentary state in the pupa, closely resembles that of xEschna 

 (Fig. 21), and essentially agrees with that of Bombus, the 

 basal pair of blades arising from the eighth segment of the ab- 

 domen, as in the humble bee, and -the two succeeding pairs 

 forming the ovipositor itself (the outer pair forming a sheath) 

 arising from the ninth segment. 



Latreille. The .Water Boatmen somewhat 

 resemble the Tettigonite, but their habits are aquatic ; their 



hind legs are very long, 

 ciliated, and formed for 

 swimming. The body 

 is convex above, but flat 

 beneath ; the head is 

 large and nearly as wide 

 as the rest of the bod}', 

 with a broad and round- 

 ed front ; the antennae 

 are four-jointed, c o 11 - 

 cealed beneath the eyes, 

 and the ocelli are want- 

 ing. The different spe- 

 cies of Corixa are com- 

 mon in every pool. Their 



motions are rapid, diving when disturbed rapidly to the bot- 

 tom and seizing hold of submerged objects. They fly well, but 

 walk with difficulty. The genus is characterized by the 

 single-jointed fore tarsi, which are flattened and strongly 

 ciliated ; the prothorax is large, covering the mesotho- 

 rax. C. internipta Say is not uncommon in pools. 



In Notonecta the body is somewhat prismatic in form, 

 and hairy beneath, where in Corixa it is smooth. The 

 fore tarsi are three-jointed, and the hind legs are very 

 42 long. Roesel states that "the eggs (which are attached 

 to the stems and leaves of aquatic plants, and are of an oval 

 form) are hatched in fifteen days ; the young make their ap- 



