1 46 | December, 
Differs considerably from northern species in the form of the 
anterior wings, which resemble those of Perla, whereas they are 
ordinarily short, broad, and obtusely angular, with a strongly dilated 
costal area, and strong and elevated veins; also in the extremely 
narrow prothorax, generally delicate appearance, and larger eyes. 
As a contribution to a knowledge of the distribution of the genus, 
I may here note that Baron De Selys Longchamps possesses one male 
Sialis from Japan, identical with, or closely allied to, 8. lutaria. 
Lewisham: 12th November, 1870. 
ON CERTAIN BRITISH HEMIPTERA-HOMOPTERA. 
(Revision of the Family Ciaiide). 
BY JOHN ScorT. 
(Continued from page 123). 
B. 
1.—WMarginal nerve with two or three of the granules, at irregular 
intervals, generally united. 
Species 2.—CIxIUs NERVOSUS. 
Cicada nervosa, Linn., 8. N., ii, 709, 25 (1767); Fab., Ent. Sys., 
iv, 442, 64 (1794). 
Cicada cunicularia, Linn., 8. N., 465, 44 (1767). 
lata nervosa, Fab., Sys. Rhyn., 54, 47 (1803); Germ. Mag., iii, 
191, 5 (1818); Fall, Hem. Suec., n, 71, 1 
(1826); Germ., Thon Archiv., ii, 48, 27 (1829). 
Cita nervosa, Burm., Handb., ii, 157, 2 (18385). 
Cizius nervosus, H. Schf., D. I., 112, 22; Zett., Ins. Lapp., 304, 1 
(1840) ; Am. et Serv., Hem., 508, 1 (1848) ; 
Marshall, Ent. Mo. Mag., i, 154, 1 (1864); 
Kirschb., Cicad., 46, 2 (1868). 
Elytra without a band before the apex, the first nerve at the base, as far as the 
bifurcation, brown or black, transverse nerves black, the space between them and 
the apex with several more or less distinct pale fuscous or brownish patches. 
Head black, margins and middle keel yellow; forehead piceous, margins yellow. . 
Face black, keels yellow, clypeus yellow, apex on each side of the middle keel 
black. Antenne brown or yellow. 
Thorax: pronotum yellow, the portion beneath the eyes and the disc behind the 
side keels, more or less broadly black, Scutellum black, middle keel, and 
