536 



IIExMIPTEP.A. 



the first object at hand, and undergo 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 of ^schna 

 (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) 

 arisino; from the ninth segment. 



NoTONECTiD^ 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 Inroad and round- 

 ed front ; the antenucie 

 are four-jointed, con- 

 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 fl^^ well, but 

 Avalk 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. interrupta Say is not uncommon in pools. 

 In Notonecta the body is somewhat prismatic in form. 

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

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

 Fig.542. j^j-,g_ 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 a])- 



