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; corium 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. LYGHUS, C. H. 533. 
Apterola, Mulsant and Rey, and Lygwodon, Puton, are included 
in Lygeus. 
Prof. Stal has divided Lygzus into the following subgenera :— 
A. Scutellum very tumid, with a deep longitudinal 
keel. - - - AULACOPELTUS. 
B. Scutellum smooth or slightly tumid, with no 
furrow. 
a. Hind border of the prothorax broadly bent; scu- 
tellum more or less tumid. - - ~ ONcopPELTUs. 
b. Hind border of the prothorax truncate. Scutellum 
flat; seldom slightly convex hindward. 
* Fourth joint of the antenne much longer than the 
second. - - - - STALAGMOSYTETHUS, 
** Second and fourth joints of the antenne about 
equal in length, or the latter a little shorter 
than the former. 
+ Prothorax with a keel extending to the fore 
border. - = - - - MeEvanospitus. 
+f Prothorax with no keel or with one not extending 
to the fore border. 
{ Metastethium obliquely truncate hindward; hind 
angles acute, with rounded tips. 
§ Antennz and rostrum long, the former shorter by 
a third than the body. - - - Pyrruoparuus. 
§§ Antenne and rostrum of moderate length; the 
former shorter by about half than the body. 
x First joint of the rostrum extending distinctly 
beyond the tip of the prostethium. = - - GRaAPTOSTETHUS. 
XX First joint of the rostrum extending to or hardly 
beyond the tip of the prostethium. = - - LyGxosoma. 
tt Hind angles of the metastethium about straight or 
obtuse, rounded at the tips. 
§ Head beneath or at least with the bucculi black, 
these very seldom narrowly reddish-bordered. 
x Furrow from the odoriferous apertures slight, 
sometimes obsolete, its borders not or very 
slightly tumid, their tips not connected, - SprLosteraus. 
xX X Furrow from the odoriferous apertures distinct, its 
borders distinctly tumid, their tips connected. 
o Outer border of the corium slightly rounded in the 
middle or behind the middle. - - GRaproLtomus. 
oo Outer border of the corium straight. - - MELANosTrETHUSs. 
