536 



HEMIPTERA. 



i he first object at hand, and imdergo their transformations 

 in the usual manner." (American Entomologist, p. 64.) 



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

 mentary state in the pupa, closely resembles that oi' ^Eschnii 

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



NOTONKCTID.K Lritveille. The Water Boatmen somewhat 

 resemble the Tettigoni;e, but their habits are aquatic; their 



hind legs are very long, 

 ciliated, and formed for 

 swimming. The body 

 -7 is convex above, but flat 



beneath; the head is 

 large and nearly as wi li- 

 as the rest of the body, 

 with a broad and round- 

 ed front ; the antenna' 

 are four-jointed, con- 

 _ cealed beneath the eyes. 

 - and the ocelli are want- 

 ing. The ditl'erent spe- 

 cies of Cori.ru 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 mesotlio- 

 rax. ('. intemipta 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 

 ],!<,. 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- 



