180 INSECTA. 



fossula. The simple eyes are situated near the middle of the vertex. 

 The body is short. These Insects at a first glance somewhat resem- 

 ble the Cercopes, and in fact Fabricius confounds them *, yC 



Near this subgenus we should apparently place that of the Gypona, 

 Germar, of which however I have never seen a specimen f. 



Jassus, Fab. Germ. 

 Where the .vertex or superior plane of the head comprised between 

 the eyes is very short, transversal, and linear, or in the form of a bow, 

 and projects but little beyond the eyes even in the middle. The la- 

 minae which support the sides of the clypeus are large. The antennae 

 are terminated by a long seta. The ocelli are situated near its an- 

 terior margin, and even under it |. In 



'^ Tettigonia, Oliv. Germ. — Cicada, Lin. Fab., 

 Or the Cicadellae or Tettigoniee, properly so called, the head, vieAved 

 from above, is triangular, without however being much elongated 

 or flattened ; a character which distinguishes these Insects from the 

 Eupelices. The eyes are not cut by its edges. The simple eyes are 

 situated between them or laterally §, but not near the front. 



These Insects are also closely allied to the Jassi by the extent of 

 their laminae, situated along the sides of the hood, and the length of 

 the terminal seta of the antennee ; it appears to be articulated at base 

 as in the Cicci, from which they almost only differ in the form of the 

 thorax |j. 



FAMILY II. 



APHIDII. 



The second family of the homopterous Hemiptera, or the fourth of 

 the order, is distinguished from the preceding one by the tarsi, which 

 are composed of but two joints, and by the filiform or setaceous an- 

 tennae, which are longer than the head and have from six to eleven 

 joints. 



Those individuals which are winged always have two elytra and 

 two wings. 



These Insects are very small ; their body is usually soft, and their 

 elytra are nearly similar to the wings, or only differ from them in be- 

 ing larger and somewhat thick. They are astonishingly prolific. 



v' , vC 4, 



* The'C. atra, hamorrhoa, sai>(juinicoUis, Germ., Magas. der Entom., IV, p. 47. 



f Germ., Ibid., p. 73. 



+ Germ., Ibid., p. 80. xj ^ Q 



§ Some species, such as the Cetropis (/risea, Transversa, striata, &c., Fab., on ac- 

 count of their flattened head furnished near its edges with simple eyes, should appa- 

 rently be formed into a separate subgenus. 



II Germar, Magas, der Eatom., IV, p. 58, genus' Tettigonia, Fab., Syst. Ryngot., 

 p. 61. 



