10 A MONOGRAPH OF THE AUSTRALIAN MEMBRACTD.H, 



lateral angles, with an acute, triquetrous, diverging horn, or 

 angulate; posterior process tectiform, a little concave below, the 

 sides of the scutellum barely visible. 



Tegmina with the apical portion of corium marked by the 

 presence of many venules, which divide it into numerous apical 

 cellules; costal cell punctured, opaque, extending beyond radial; 

 exterior discoidal cell not petiolate; clavus punctured and opaque 

 over basal half, not gradually narrowed towards apex, with two 

 veins. 



Wings with four apical cells. 



Tibise dilated. 



Type, Centrotus virescens, Fairm. 



Synopsis of Species. 



1 (4). Prothorax armed with a horn above each lateral angle. 



2 (3). Lateral horns directed outward, depressed towards apex, 



never turned upward; dorsum between lateral angles 

 flat, never convex; corium destitute of a transverse 

 venule between two ulnar veins clepressus. 



3 (2). Lateral horns turned outward and upward; dorsum 



between lateral horns convex; corium furnished with 



a transverse venule between two ulnar veins near base, virescens. 



4 (1). Prothorax unarmed or lightly tuberculate above lateral 



angles; a black spot on interior vein of clavus bijmnctatvs, 



'-'S. VIRESCENS, Fairm. 



(Plate i., fig. 2.) 



1846, Centrotus virescens, Ann. Soc. Ent. Fr. (2), iv. p. 515. 

 1851, Ceresa suffusa, Walk., List Hom. Brit. Mus., p. 530. 



Pale greenish or tawny, punctured, sometimes marked with 

 piceous. 



Prothorax with the lateral horns directed outward, slightly 

 upward, usually much more elevated than the dorsum which is 

 convex between the horns; posterior process long, slender, tecti- 

 form, extended nearly to apices of tegmina, tip decurved. 



Tegmina pale tawny, a transverse venule between the two 

 ulnar veins, near the base, the interior discoidal cell long and 



