Division Discogastraria. 
SAVIUS DIVERSICORNIS. 
Homæocerus diversicornis Hope. Cat. Hem. II, p. 22 (1842). 
CORYZOPLATUS RHOMBOIDEUS var. 
Discogaster rhomboideus Burm. Handb. IL, I, p. 315, 1 (1835). 
À specimen from Botafago appears to be a pale variety of this 
species, the green colouration being either faded or absent. 
Sub-fam. Alydinæ. 
Division Alydaria. 
HYALYMENUS SINUATUS. 
Cimex sinuatus Fabr. Mant. Ins. II, p. 290, 110 (1787). 
HYALYMENUS TARSATUS. 
Hyalymenus (Tivarbus) tarsatus Stäl. Hem. Fabr. I. p. 62, 3 
(1868). 
ALYDUS PALLESCENS. 
Alydus pallescens Stäl. Rio-Jan. Hem. I, p. 34, 1 (1860). 
Division Leptocorisaria. 
PERUDA gen. nov. 
Head very short and broad, strongly deflected in front; the eyes 
somewhat exserted, their outer margin parallel to the outer margin 
of the pronotum. Pronotum long, robust and bilobed, the anterior 
lobe moderately convex, the posterior lobe deflexed at posterior 
angles which are foveate and laminate. Scutellum gibbous at base and 
armed with a robust spine at apex which is not erect. Body elongate, 
hemelytra much shorter than abdomen; legs long and slender; 
antennæ long and slender. Rostrum short not extending much 
beyond anterior coxæ, basal joint incrassated, penultimate joint 
longest. 
Peruda typica n. sp. 
Pale castaneous; apical spine to scutellum pale bright ochraceous. 
Hemelytra pale greyish hyaline. Anterior and intermediate tibiæ 
infuscated, the tarsi ochraceous (posterior tibiæ mutilated). Apex of 
the rostrum pitchy; the posterior coxæ ochraceous. Antennæ dark 
castaneous, basal joint with the apex infuscated. 
Antennæ with the basal joint somewhat thickened, shorter than 
the second and third joints, the third joint longer than the second 
(fourth mutilated). Head and posterior lobe of the pronotum pilose, 
the last with the posterior angles obscurely ochraceous, scutellum 
with the basal angles palely, pilose. 
Long. 18 millim. 
Hab. Rio Janeiro. 
