1883.] 149 



leaving tlie apex of abdomen uncovered, not overlapping at the apex, sub-corneous 

 with an irregular, very shallow, punctuation, membrane with an extremely narrow 

 appendix. Wing-nerves as in Thamnotettlx. 



My view of the geueric clistributiou of our British species may 

 he concisely expressed iu the following table : 



J AS SID ^. 



1 (22) Vertex not angular in front. 



2 (9) „ impressed. 



3 (8) „ sub-angularly produced. 



4 (7) „ with one transverse impression. 



5 (6) Impression straight, reaching from the anterior angle of one eye to that of 



the other Doratura, S . ^&h\h. 



6 (5) Impression parallel with the anterior margin throughout 



Olyptocephalus, g. n. 



7 (4) Vertex with three impressions, two (oblique) at the posterior margin, and 



one (transverse) in front OraphocrcBrus,1h.oxns. 



8 (3) Vertex sub-lunate, transversely rugulose in front Paramesus, Fieb. 



9 (2) „ plane or slightly convex, not impressed. 



10 (19) Elytra overlapping at apex. 



11 (16) Outer cubital nerve well defined. 



12 (15) Side margins of pronotum of moderate length, separated from prosteraum 



by a sharp keel. 



13 (14) Elytra with several irregularly disposed white transverse nerves... 



Alli/fftis, Fieb. 



14 (13) Elytra without irregularly disposed white transverse nerves .. 



Thamnotettix, Zett. 



15 (12) Side margins of pronotum extremely short, keel obsolete or wanting .. 



Limotettix, J. Sahib. 



16 (11) Outer cubital nerve obsolete or wanting. 



17 (18) First wing-nerve and upper branch of the second separate at their junction 



with the sub-marginal nerve Cicadula, Zett. 



18 (17) First wing-nerve and upper branch of the second concurrent near the 



apex, and running into the sub-marginal nerve as one nerve... 



Gnathodus, Fieb. 



19 (10) Elytra not overlapping at apex. 



20 (21) Side margin of frons below the antenna nearly straight, as long as, or longer 



than, the width of the frons between the antennae . . 



Stictocoris, Thorns. 



21 (20) Side margin of frons below the antennoe curved outwards, much shorter 



than the width of the frons between the antennis ...Athysamis, Burra. 



22 (1) Vertex angular in front. 



23 (24) Frons flat, very narrow, at least three times as long as its width between 



the antennae Platymetopius, Burm. 



24 (23) Frons convex, not more than twice as long as its width between the 



antennae Deltoeephalus, Burm. 



"With regard to the genus Allygus, Fieb., it may be remarked that 

 the characters given in Ent. Mo. Mag., xii, p. 170, req^uii'e amendment, 



