570 INSECTA. 



dilated into short wing-like appendages, and the hind tibije are very compressed, and margined by a membrane. 

 C. atirita, Linn., [a species not uncommon in the woods in Kentl. 



Ciccus, Latr., has the antennas terminated suddenly after the second joint in a seta composed of four distinct 

 cylindric and elongated joints ; the anterior extremity of the head is generally advanced. [Exotic species.] 

 Messrs. Serville and Saint Fargeau [as well as Drs. Germar and Bunneister] have established numerous additional 

 genera in this group. The Eitrymela fenestrata, Serv. and St. F., described by them as Brazilian, is a native of 

 New South Wales, the description given of which by these authors being inexact, the insect possessing ocelli, 

 although difficult to be detected. Hence this genus ought to be introduced at the genus Issus. 



Cercopis, Fab., Germ. (Aphrophora, Germ.), has the third joint of the antennae conical, and terminated by an 

 articulated seta. 

 [C. vulnerata, Rossi, the only British species closely allied to C. sanffuinolenta, Linn., is a common 



insect, and the handsomest in the family; being black, with 

 blood-red spots.] C. [Ap/irophora] spumaria, Linn., is an ex- 

 tremely abundant species, the larva of which is found upon 

 leaves and twigs in the midst of a frothy secretion, of a vihite 

 colour, which has been commonly called Cuckoo-spit. 



Fig. 101. — Aphrophora spumaria ; tr^ imago ; 6, frothy secretion 



In the other Cicadariae, terminating this family, [and 

 forming the tribe Cicadellines, and which in tlie earlier 

 works of Fabricius formed his genus Cicada], the pro- 

 ' thorax is not at all, or scarcely, prolonged posteriorly, 

 and is terminated by a straiglit, or nearly straight, line, as long as the breadth of the body, the 

 scutellum, at its base, occupying a great portion of this breadth. 



Eulopa, Fallen, has the eyes very prominent, the head but little advanced beyond the eyes, but depressed, 

 and forming a kind of ridge round the face ; two ocelli placed on the posterior and superior part of the head, and 

 legs destitute of spines or teeth. C. Ericce, a small species, [found on heaths]. 



Eupellv, Germar, has the head in the form of an elongated and very Hat triangle, with the ocelli situated in 

 front of the eyes, upon the edges of the head, which are prolonged, nearly cutting through the eyes. C. cuspidata. 

 Fab. [a rare British species, found with the preceding]. 



Penthimia, Germ., has the antenna; inserted in a large channel, reducing the space between the eyes more than 

 ordinary ; the head, seen from above, appears semicircular, and gradually deflexed in front ; it is rounded, and its 

 edges are extended above these channels ; the body is short. These insects have some resemblance to Cercopis, 

 with which Fabricius united them. C. sanguinicolUs, Fabr., [a very rare British species]. 



Gypona, Germar, appears to be closely allied to Penthimia, but I have seen no specimen of that subgenus. 



lassies, Fabr., has the superior surface of the head comprised between the eyes, very short, transverse, and 

 linear, or arched, and very little advanced even in the middle beyond the eyes. The plates at the sides of the 

 clypeus are large ; the antenna; terminate in a long seta ; the ocelli are situated near or below the anterior margin 

 of the head. [Numerous small British species, divided by Curtis, Lewis, Burmeister, and Germar into various 

 subgenera.] 



Cicadella proper, or Tettigonia, Fabr., Oliv. ; Cicada, Linn., has the head, seen above, triangular, without being 

 either very long or very flat, whereby it is distinguished from Eupelix ; the eyes also are not cut into by the sides 

 of the head ; the ocelli are situated between them. These insects are, in other respects, very nearly related to 

 lassus, as well as in respect to the extent of the plates at the sides of the face, and the length of the seta of the 

 antennae, which appears to be articulated at its base, as in Ciccus, from which it chiefly differs in the form of the 

 thorax. [This is also a very numerous group, which has been likewise much cut up by late writers.] Some of the 

 species, as C. grisea, transversa, striata, Fabr., appeared to Latreille to form a distinct subgenus, from the flat- 

 tened form of the head, and the ocelli inserted near its edge. 



THE SECOND FAMILY OF THE IIOMOPTEROUS HEMIPTERA.— 

 The Aphidii, commonly called Plant Lice, — 



"Which are distinguished from the preceding by having only two joints in the tarsi, and the antennaj 

 filiform, or like a thread, and longer than the head, composed of from six to eleven joints. 



The winged individuals Lave always two wing-covers and two wings. These are very small insects, 

 having the body generally soft, and the wing-covers very similar to wings, differing ouly in being larger 

 and somewhat thicker. They multiply with exceeding rapidity. 



Some have ten or eleven joints in the antennae, the last of which is terminated by two setie. They 

 leap well, and form the genus 



PsYLLA, Geoff. {Chermes, Linn.). 



These Ilemiptera, which are also termed by the French False Plant-lice, live upon trees and plants, 



