HEMIPTERA. 569 



In others, the antennae are at least as long as the head, and often inserted in a notch below the eyes. 



Anotia, Kirby, allied to Otiocerus, and which approaches the preceding in the mode of insertion of the 

 antennae. [Small exotic insects.] 



Asiraca, Latr. (Delpliax, Fab.), has the antenna; 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.] 



Delpliax, 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. [Numerous 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.] 



Derbe, Fabr., are unknown to me, but I presume they come near the preceding insects, and especially 

 to Anotia. 



In the terminal Cicadarias the antennae are inserted between the eyes. These compose the genus 



CiCADELLA (or the Cicadm Ranatra, 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 Memlracis 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 CicadellincB]. 

 Some [the Membracides'] have no scutellum, properly so called, exposed. 



Memhracis, Fab. Graving 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, aud 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 

 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, two 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 

 r~ ,^ „ ,. , V , „ A R ^,„.i.„„„, amongst them are to be found some of the most anomalous 



Fig 100. — (ly Bocydmm globulare ; o, B. crucmiuni. ^ 



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 Entomologist's Text Book, 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, offering 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 tibiae 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, aud terminated by a truncature fitting to 

 the base of the scutelhim, and often receiving it ; this truncature being concave, or cniarginate. 



station, Latr., has the crown of the head transverse, the forehead being suddenly detlexed in front, and the 

 antenna; 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 mserted in a 

 line drawn between the eyes. 



Ledra, Fab., has the head very flat between the eyes, like a transverse clypeus ; the sides of the prothorax are 



