40 NOTONECTID^ 



Family NOTONECTID.E. 



Notonectfe, Fieb. E/njncJiotot/r. p. 45 (1851), 



Notouectidaj, Curtis, Brit. Eatom. i, p. 10, pi. 10 (1824) ; Kirk. Tr. 



E. S. 1897, p. 394. 

 Notonectida, StSl, Hon. Afr. iii, p. 190 (1865). 



Eocly oblong, convex ; eyes large ; ocelli absent ; antennae short, 

 four-jointed; rostrum three- or four-jointed; scutellum large, 

 triangular : anterior legs inserted at the posterior margin of the 

 prouotum. 



Synojysis of Suhfamilies. 



A. Posterior tibise and tarsi ciliate ; abdomen 



beneath centrally carinate ; rostrum four- 

 jointed ; eyes large and conspicuous Notojiectince. 



B. Posterior tibite and tarsi not ciliate ; abdomen 



beneath not carinate ; rostrum three-jointed ; 



eves small Fleince. 



Subfamily I. NOTONECTIN^. 



NotonectiuEe, Kirk. Tr. E. S. 1897, p. 394. 



The characters for this subfamily having already been detailed, 

 it only remains to define the genera, 



Syii02:>sis of Genera. 



A. Pronotum moderately long, not transverse. 



a. Last joint of antennae much shorter than penul- 

 timate joint : posterior tarsi not provided 

 •with unguiculi * Notonecta, p. 40. 



\>. Last joint of antennae much longer than pen- 

 ultimate j oint : posterior tarsi provided with 

 unguiculi Anisops, p. 44. 



B. Pronotum short, transverse, its anterior angles 



oveately excavate Enithares, p. 42. 



Genus NOTONECTA. 



Notonecta, izVm. Syst. Nat. ed. x, p. 439 (1758) ; Fieb. Rhynchotogr. 

 p 48 (1851) ; Saund. Hem. Heteropt. Brit. Ishls. p. 329 (1892) ; 

 Kirk. Tr. E. S. 1897, p. 397. 



Type, N. glauca, Linn. 

 Distribution. Practically universal. 



* Unguiculi = hooks of tarsal claws. 



