440 CLASS VIII. 



of terminal claws. Body depresso-cylindrical or oblongo-ovate, 

 thickish. 



Notonecta L. 



f Anterior tarsi uniarticulate. 

 a) Scutellum not distinct, covered by prothorax. 

 Corixa GEOFFR., LATR., (Sigara FABR.) 



Sp. Notonecta striata L., RCESEL, Ins. in. Tab. 29, fig. d; SCHELLENBERG, 

 Cimic. Tab. ix. ; Cor. Geoffroyii LEACH, Cor. jptwctatoBuRM., RCESEL, 1.1. 

 figs, a, b, &c. 



6) Scutellum distinct. 

 Sigara LEACH (species of Sigara FABR.) 



Sp. Sigara minuta FABR., Notonecta minutissima L. 

 "M* Anterior tarsi triarticulate. Scutellum distinct, 

 a) Posterior feet terminated by two claws. 



Ploa STEPH., BURM., Plea LEACH. 



Sp. Notonecta minutissima FABR., (not L.), PANZER, Deutschl. Ins. 2, Tab. 

 20 ; only i'" long. 



6) Posterior feet with tarsi biarticulate, without claws. 

 Notonecta FABR., (exclu. N. minutissima}, LEACH, BURM. 



Sp. Notonecta glauca L., RCESEL, Ins. in. Tab. 27; SCHELLENB. Cimic. 

 Tab. x. ; PANZER, Deutschl. Ins. Heft 3, Tab. 20. Water-lug ; it swims on 

 its back, and stings severely 1 . 



B. Two anterior feet cheliform, the tibia and tarsus forming a 

 curved hook to be lodged upon the thighs, incrassated and grooved 

 on their anterior inner margin (Nepa L.). 



Naucoris GEOFFR., FABR. Antennas quadriarticulate. Head 

 almost as broad as thorax. Anterior tarsi uniarticulate. Body 

 ovate, depressed. 



Sp. Naucoris cimico'ides, Nepa cimico'ides L., RCESEL, Ins. m. Tab. 28; 

 SCHELLENB. Cimic. Tab. xn. ; PANZER, Deutschl. Ins. Heft 95, Tab. 16, &c. 



Belostoma LATR. Antennae quadriarticulate. Head small, nar- 

 rower than thorax, triangular. Anterior tarsi biarticulate. Body 

 ovate, depressed. 



1 Comp. on this sub-genus LEACH in Lin. Transact. Vol. xn. 1818, pp. 10 18. 



