134 Annals Entomological Society of America [Vol. I, 



Stal, in 1870, in his Enumeratio Hemipterorum, Vol. i, 

 divides the genus into three sub-genera as follows: Liorhyssus, 

 Niesthrea and Arhyssus, and fohows this up in the third volume 

 of the same work three years later on pages 97 and 98 by aban- 

 doning the genus Corizus entirely and creating from it three new- 

 genera, Liorhyssus, Peliochrous and Stictopleurus. Fieber, in 

 1 86 1, had also made three genera of this genus, namely: Rhopa- 

 lus, Corizus and Brachycarenus. 



Lethierry and Severin in 1893 have abandoned these sub- 

 divisions and retained the genera Corizus and Maccevethus. 



DESCRIPTION OF THE GENUS. 



Body, narrowly ovate or oblong-ovate. Head short, conically 

 produced in front of the eyes and narrowing abruptly behind. 

 Rostrum reaching the posterior coxae. Antennae slender with 

 first and last segments thickened, the former short, scarcely reach- 

 ing or but slightly passing the apex of the head. Pronotum tra- 

 pezoid shaped, crossed near its anterior margin by the transverse 

 suture which is more or less plainly marked, and is interrupted at 

 its middle by the median line. Scutellum a little longer than 

 wide. Membrane with numerous simple veins. Metapleura 

 dilated posteriorly. Legs medium, unarmed, the posterior pair 

 slightly the longest. Body pubescent and punctured. 



Taken as a whole the genus is truly cosmopolitan, being found 

 both in the temperate regions and in the tropics. It is probably 

 more abundant in the latter but is widely distributed in the 

 former. One species, hyalinus, has been reported from Australia 

 and the Philippines, Europe, Asia, Africa and America. An- 

 other species, crassicornis, is circumpolar in its distribution, being 

 found in northern and central Europe and in northern North 

 America, and entirely across Siberia. Still other species, such 

 as scutatus and tuberculatus, as far as known, are confined to 

 comparatively small areas. 



Little is known of their habits. They probably hibernate, in 

 temperate regions, in the adult state and deposit their eggs in 

 early summer when their food plants have developed sufficiently 

 to furnish food for their young, and reach maturity in early 

 autumn. None of the species are sufficiently numerous to be of 

 economic importance, though under changed conditions they 

 might easily become so. 



