HEMIPTERA. 
569 
In others, the antennae are at least as long’ as the head, and often inserted in a notch below the eyes. 
Anoiia, Kirby, allied to Otiocerus, and which approaches the preceding in the mode of insertion of the 
antennae. [Small exotic insects.] 
Asiraca, Latr. {Delphax, Fab.), has the antennae inserted in a notch below the eyes, as long as the head and 
thorax, with the first joint generally longer than the second, compressed, and angulated; the ocelli are 
wanting. [A. clavicornis, Latr., a small, exceedingly active species, and several others, inhabitants of this 
country.] 
Delphax, Fab., has the antennae similarly inserted, but not longer than the head, with the first joint much 
shorter than the second ; the ocelli are present. [Numei’ous very small species, found by sweeping grass at the 
sides of roads, commons, &c. Some of the species occasionally have the wing-covers only partially developed. 
These constitute the genus Criomorphus, Curtis.] 
Derhe, Fabr., are unknown to me, but I presume they come near the preceding insects, and especially 
to Anotia. 
In the terminal Cicadariae the antenna are inserted between the eyes. These compose the genus 
CicADELLA (or the Cicadas Ranatras, Linn.), — 
Which may be thus divided : — 
We commence with the species which, with the exception of a small number, (Ledra,) formerly com- 
posed the genus Menibracis of Fabricius. The head is very much deflexed, or low in front, and pro- 
longed into an obtuse point under the form of a clypeus, more or less semicircular. The antennae are 
always very small, terminated by an inarticulate seta, and inserted in a cavity under the margins of 
the head ; the prothorax is sometimes dilated, and horned on each side, and prolonged behind into a 
simple or composite horn, and sometimes it is elevated longitudinally down the back, compressed like 
a crest, sometimes porrected and pointed in front ; the legs are seldom spined. 
[This genus comprises three principal groups, — the Membracides, Cercopides, and Cicadellin(js]. 
Some [the Membracides] have no scutellum, properly so called, exposed. 
Menibracis, Fab. (having the prothorax elevated, compressed, and leaf-like along the middle of the 
back), and 
Tragopa, Latr. (where this part of the body is horned, or pointed on each side, without any intermediate eleva- 
tion, and posteriorly produced into a point as long as the abdomen), have the tibiae, especially of the fore-feet, 
foliaceous. 
In the following the tibiae are of the ordinary form, and not foliaceous. 
Darnis, Fabr., in which the prolongation of the prothorax 
is in the shape of a long triangle, covering the wings and 
abdomen. 
! Bocydium, Latr., has the prolonged part narrowed so as 
j to expose the wings and sides of the abdomen, and more 
or less lanceolate, or spear-shaped. [Such are Bocyd. glo- 
bulare, and B. cruciatum, tw^o extraordinary Brazilian in- 
sects, of small size, here figured. The majority of the species 
of Membracides are exotic, of small or but moderate size, and 
amongst them are to be found some of the most anomalous 
forms.] 
In others the scutellum, although the prothorax is prolonged, is exposed, at least in part, the posterior 
extremity of the prothorax exhibiting a transverse suture, which distinguishes it from the scutellum. These 
form the subgenus Centrotus proper. Types, C. cornuta and C. genista;. [Two small species, of rather common 
occurrence in woods in this country, the last of which is figured in the EntomologisV s Text Booh, pi. 3. f, 2.] 
We now pass to the species in which the head is but little lower than, or on the same plane as, the 
prothorax ; horizontal, or but little deflexed when seen from above, and in which the prothorax is 
neither elevated in the middle, nor posteriorly prolonged, olfering only lateral dilatations, and in which 
the mesothorax assumes the form of a triangular scutellum, of the ordinary size ; the wing-covers are 
always exposed ; the posterior tibise are more or less spined. 
In many, such as the following [which compose the tribe Cercopides], the thorax has the form of 
an irregular hexagon, being prolonged and narrowed behind, and terminated by a truncature fitting to 
the base of the scutellum, and often receiving it ; this truncature being concave, or emarginate. 
AEtalion, Latr., has the crown of the head transverse, the forehead being suddenly deflexed in front, and the 
antennae are inserted above a line drawn between the eyes. [Brazilian insects.] 
In the three following subgenera the vertex is triangular and bears the ocelli, and the antennae are inserted in a 
line di’awn between the eyes. 
Ledra, Fab., has the head very flat between the eyes, like a transverse clypeus ; the sides of the prothorax are 
Fig 100.— Bocydium globulare ; &, B. cruciatum. 
