68 LTemiptera-fLeteroptera. 
have their posterior margins straight, or nearly so; in the 
Lygeinn the sixth segment only is emarginate. In the 
Pachymerina and Artheneina and Blissina the fifth segment 
is deeply emarginate, and the sixth has its centre keeled 
or divided longitudinally ; this central division or keel is 
doubtless the theoretical posterior margin of the sixth see- 
ment, and between its sides les in some cases the oviposi- 
tor. In the Henestarinw and Cymina the fourth is slightly 
emarginate, the fifth deeply, and the sixth as in the others ; 
in the Heterogastrina both the fourth and fifth are very 
deeply emarginate. In the ¢ the terminal cenital sezment 
is convex beneath and rounded, or more or less truncate 
posteriorly ; the other segments are straight at the apex or 
nearly so. 
Our British genera may be divided into eight sub- 
families. 
TABLE OF SUBFAMILIKES. 
(14) 1. Ocelli present. 
(5) 2. All the abdominal stigmata situated on 
the connexivum. 
(4) 3. Elytra not punctured or only very ob- 
soletely . : : : : : . LyGzIna, 
4, Elytra distinctly punctured. . .. CYMINA. 
5. The stigmata of one or more abdominal 
segments ventral. 
(7) 6. The stigmata of the sixth segment only 
ventral . : : ; i : . Buisstva. 
7. The stigmata of at least the last two abdo- 
mival segments ventral. 
8. The stigmata of the fifth and sixth seg- 
ments ventral, eyes pedicillate . . HENESTARINA. 
(8) 9. The stigmata of all or at least of the last 
three seements ventral. 
(11) 10. Cheeks scarcely shorter than the central 
lobe of the face. . ‘ : ; . ARTHENEINA. 
(10) 11. Cheeks much shorter than the central lobe. 
(13) 12. Membrane without basal cells . : . PacHYMERINA. 
(12) 13. Membrane with basal cells ‘ ; . HETEROGASTRINA, 
(1) 14. Ocelli absent A E , A : . PYRRHOCORINA, 
LYGASINA., 
Species black and red, antenniferous tubercles rounded . Lyamus 
Species ochreous, antenniferous tubercles angular. . Nystus. 
