British Hemiptera-Heteroptera. 127 
ACANTHOSOMA. 
I, Hind angles of thorax not produced and pointed. 
A. Connexivum spotted with black ar as griseum. 
AA. Connexivum not spotted with black. 
a. Membrane extending much beyond the 
apex of the body.. ae Sc - dentatum. 
b. Membrane extending very little beyond 
the apex of the body ee - tristriatum. 
II. Hind angles of thorax produced and pontted -» hemorrhoidale. 
1. griseum, Lin. Fig. (agathinum) Panz. Faun. Germ. 
P14; YOs, 11. 
Ochreous or reddish-ochreous. Connexivum pale, with 
black spots; beneath pale. Surface very largely and 
irregularly punctured with black. Scutellum generally 
with a dark spot at the base. Connexivum sometimes 
red at the apex. 
Length 34-—4 lines. 
Common on birches. 
2. dentatum, De Geer. Fig. Panz. Faun. Germ, 115, 13, 
14 (too highly coloured). 
Dirty yellowish-green ; base of the thorax, clavus and 
corium internally red; beneath and legs yellowish; apex 
of body blood-red. Connexivum very narrow, pale. 
Antenne pale at the base, apical half dark. Surface 
roundly punctured with black all over. 
Length 4 lines. 
Not uncommon on birches. 
3. tristriatum, Fab. Fig. (pictum) Dougl. & Scott, Brit. 
Hem. pl. iv. fig. 2. 
Bright pale green. Elytra with the clavus and the 
corium, within the nerve, blood-red; hind angles of the 
thorax and the extreme apex of the connexivum of the 
same colour. Apex of the scutellum and a spot at each 
basal angle pale. Thorax roughly punctured in front, 
rather finely behind. Elytra finely, scutellum largely 
punctured ; punctures not black. 
Length 4 lines. 
On junipers; local; Boxhill, &c. 
4, hemorrhoidale, Linn. Fig. Dougl. & Scott, Brit. 
Hem. pl. iv. fig. 1. 
Of a lurid ochreous colour, or greenish; much larger 
than any of the preceding. Thorax strongly angulated at 
the sides; angles more or less red, with the apex black; 
