HEMIPTERA HETEROPTERA. 37 



like the sides is red. Legs black, moderately long and slender. Wings 

 extending to the tip of the abdomen. Fore wings black ; coiium red along 

 the interior border and along the exterior border ; membrane whitish at the 

 tip. Length of the body 4 lines. 



a. Australia. Presented by the Entomological Club. 



Genus 2. LYGiEUS, C. H. 533. 



Apterola, Mulsant and liey, and Lyga;odou, Puton, are included 

 in Lygaeus. 



Prof. Stal has divided Lygaus into the following subgenera: — 



A. Scutellum very lumid, with a deep longitudinal 



keel. ----- AuLACopELius. 



B. Scutellum smooth or slightly tumid, with no 



furrow. 



a. Hind border of the prothorax broadly benl; scu- 



tellum more or less tumid. . - - Oncoi'eltus. 



b. Hind border of the prothorax truncate. Scutellum 



flat; seldom slightly convex hindward. 

 * Fourth joint of the antenna' much longer than the 



second. - - _ - Stai.agmosxethus. 



** Second and fourth joints of the antennie about 

 equal in lenglli, or the latter a little shoiter 

 than the former, 

 f Prothorax with a keel extending to the fore 



bolder. . - . _ . Melanospilus. 



ft Prothorax with no keel or with one not extending 

 to the fore border. 

 J Metastethium obliquely tunicate hindward; hind 



angles acute, with rounded tips. 

 § Autenuae and rostrum long, the former shorter by 



a third than the body. - - . PyuRiionAPiius. 



§§ Autenn;e and rostrum of moderate length ; the 



former shorter by about half than the liody. 

 X First joint of the rostrum extending distinctly 



beyond the tip of the proslethium. - - Guaptostethus. 



XX First joint of the rostrum extcmling to or hardly 



beyond the tij) of the prostelhium. - - LygyEOSOma. 



X\ Hind angles of the metasiethium about straight or 



obtuse, rounded at the li|)s. 

 § Head beuealh or at least wiili the i)ucculi black, 

 these very seldom narrowly reddish-bordered. 

 X Furrow from the odoril'erous apertures slight, 

 sometimes obsolete, its bordeis not or very 

 slightly tumid, their lips not connected. - Spilo^tethus. 



XX Fuirow from the odoriferous apertures distinct, its 

 borders distinctly tumid, their tips connected. 

 o Outer border of the eorium slightly rounded in the 



middle or behind the middle. - - Gkaptolomus. 



00 Outer border of the eorium straight. - . Melanostexhus. 



