HEMIPTERA HETEROPTERA. 201 



5. SlGARA PoWERI. 



Poweri, Dougl. and Scott, Ent. M. Mag. v. 296. 

 England. 



6. SlGARA FUSCATA. 



fuscata, Stal, Eug. Resa, 268. 

 Monte Video. 



7. SlGARA SCUTELLARIS. 



scutellaris, Stal, Ofv. K. V. Ak. Fork. xv. 319 ; Hem. Afr. iii. 193. 

 South Africa. 



8. SlGARA SULCATA. 



sulcata, Sgnt. A. S. E. F. '3me Ser. viii. 971. Stal, Hem. Afr. iii. 193. 

 Madagascar. 



Div. 2. 

 Nychia, Stal, Eug. Resa, 268. 



9. SlGARA LIMPIDA. 



Nychia limpida, Stal, Eug. Resa, 269. 

 Wampoa, China. 



Fam.2. NOTONECTID^. 



Notonectidae, Serv. Hist. Hem. 449 — Notonectici, Burnt. — Notouectida 

 and Pleida, Stal, Hem. Afr. iii. 190, 192 — Notonectidea, Notonectaj 

 and Plese, Fieb. Eur. Hem. 22 — Notonectica, Flor. — Notouectina, 

 Notonectidae and Pleidae, Dougl. and Scott, Hem. 48. 



A. Rostrum two-jointed. Antennae three-jointed. - 1. Plea. 



B. Rostrum four-jointed. Antennae four-jointed. 



a. Prothorax with a large impression in the fore angles. - 2. Enithares. 



b. Prothorax with no impression on the (ore angles. 



* Fourth joint of the antennae shorter than the third. - 3. Notonecta. 

 ** Fourth joint of the antennae longer than the third. - 4. Anisops. 



Genus I. PLEA. 



Plea, Leach, Trans. Lin. Soc. xii. 14. Fieb. Eur. Hem. 31, 101. Dougl. 

 and Scott, Hem. 591 — Ploa, Stepk. Eurm. Ilandb. Ent. ii. 189. 

 Serv. Hist. Hem. 449. Fieb. Ent. Mon. 17, 1. 



Europe. 

 1. Plea minutissima. 



, Geoffr. Ins. i. 477 — Notonecta minutissima, Fabr. Ent. 



Si/st. iv. 59 ; Sgst. Rhyn. 101. Panz. Faun. Germ. 2, 12. Oliv. Enc. 



2 D 



