4 HEMIPTERA-HOMOPTERA. 
2. Head not three-lobed. 
‘A. Form, if viewed from above, more or less elongate or 
oblong, sometimes obtriangular. 
a, Pronotum without anterior horn or prominence, at most 
projecting in an obtuse angle or very blunt point. 
a*, Pronotum with strong-and robust lateral horns above 
shoulders ; ocelli placed on a line drawn through 
upper margins ofeyes . . » « « «+ + «© « « Pterygia, Lap. 
b*. Pronotum without lateral horns above shoulders. 
at. Dorsal ridge even, if viewed from the side, 
aj. Form obtriangular; tegmina with three dis- | , 
coidal areas. . . . «. - « « « « « « Tropidoscyta, Stal. p.\* 
bt. Form oblong; tegmina with two discoidal areas, Leioscyta, gen. nov. p.' 4 
b+. Dorsal ridge strongly and deeply notched, if viewed 
from the side . . . «ww ws ww © ©) ©6Tylopelta, gen. nov. 
b. Pronotum with anterior horn or prominence, the latter 
being sometimes very broad, blunt, and tuberculate, 
in which case one or two more large tubercles are 
present on dorsum. 
a*, Anterior horn of pronotum long, dilated at apex, 
apex carinate, if viewed from above; dorsum even. Philya, Walk. 
6*. Anterior horn of pronotum broader at base, much 
narrower and not dilated at apex; dorsum even; 
elytra strongly reticulate towards apex. . . . . Scalmophorus, gen. nov. 
c*. Dorsum variable, even, with a long, broad, almost 
upright horn, or broadly trituberculate, or with an 
anterior horn dilated at apex and carinate on upper 
surface, in which case a large tubercle is present at . 
the base of the horn. . . . . . . « ~ « » Hypsoprora, Stal. 
B. Form globular, very short and stout. 
a. Elytra with two discoidal areas ; wings with four apical 
areas; sizesmaller. . . . . . . =. ». « « ~ Bolbonota, Am. et Serv, 
b. Elytra with four discoidal areas; wings with five apical | 
areas; sizelarger . . . . . . . =... « « Bolbonotodes, gen. nov. 
MEMBRACIS. 
Membracis, Fabricius, Mant. Ins. ii. p. 262 (1787) ; Amyot et Serville, Hist. Nat. des Ins. Hémipt. 
p. 583; Stal, Kongl. Sv. Vet.-Ak. Handl. (Hem. Fabr.), Band viii. 1, p. 38. 
This genus originally contained a large number of species which have been referred 
to other genera ; it is now very well-defined, containing only the large and conspicuous 
insects with the pronotum. strongly raised and foliaceous, and more or less rounded, 
sometimes semicircular ; they appear to be confined to Tropical America. The larve 
of the genus are very curious, being of much the same shape as the perfect insect, but 
formed of separate upright narrow plates of different heights, 
