Hale — Aquatic Hemiptera SI 3 



KEY TO THE ArSTRALIAN GENERA. 



a. Seulelluni almost or I'litirrly coiiecalcd Curixa and sub-genera 



I). Proiiotum and hemelytra more or less 

 rastrate; pronotum with transverse 



markings Arctocorisa 



l)b. Pronotum and hemelytra densely pune- 

 tured ; pronotum without transverse 



markings Porocorixa siibg. nov. 



aa. Scutellum not eoncealed. 



c. Scutellum small ; antennae three-jointed . 

 ee. Scutellum large; antennae four-jointed . 



Micronecta 

 Diaprepocoris 



CORIXA Geoffroy. 



Sub-genus ARCTOCORISA Wallengren. 



Arctocorisa Walleng., Ent. Tidskr., xv, 1894, p. 159. 

 Basileocorixa Kirk., Entomologist, 1898, p. 253. 



Type, A. variegata Walleng. 



May be separated from other sub-genera of Corixa by the following charac- 

 ters: Face excavated in male, convex in female. Fatal comb composed wholly 

 of strong chitinous pegs, none being In-istle-like. Pronotum more or less 

 rastrate and with transverse lineations. Henudytra with vermiculate markings. 

 A strigil present on the right side of abdomen of male. 



ARCTOCORISA AUSTRALIS Fieber. 



Cori.ra austral is Fieber, Abhand. der kcinigl. bohm. Ges. der Wiss. (5), vii, 1852, 

 p. 232, pi. i, fig. 15; Kirk., Ann. Mag. Nat. Hist. (6), xx, 1897, p. 55. 

 $ Head ochraceous, prominent, longer than its Avidth at base between eyes, 



evenly rounded in front ; a longitudinal median carina, slightly produced at basal 



Fitr. 340. Arctocorisa australis. 



