212 HOMOPTERA. 



and orange spots. It expands nearly two inches. The genus 

 Lystra, Fabr., includes rather smaller species, all American. 



In the Cixiince the prothorax is much shorter than the meso- 

 thorax, and the elytra are generally transparent. Cixius IServosus, 

 Linn., the commonest European species, measures one-third of an 

 inch in length ; it is of a reddish yellow, with black abdomen, and 

 transparent wings. 



The sub-family Caloscelince have leaf-like appendages on tbe 

 front femora and tibiae, and a spine in the middle of the hind 

 tibise. The typical species is Caloscelis BoneUii, Latr., a Sardinian 

 insect an eighth of an inch long. It is black, with yellow thorax 

 and fore wings, the latter bordered with black. 



The Delphacince may be distinguished by the long spine at the 

 tip of the hind tibiae, and by their comparatively long antennaj. 

 The species are capable of leapmg. Delphax Flavescens, Fabr., is 

 one-sixth of an inch in length ; it is yellowish, with transparent 

 wings, and is a common European species. 



The Derhince differ from the last sub-family by their unarmed 

 hind legs. The species are all foreign, and Deribia Coccinea, Gu^r., 

 may be mentioned as a uniform bright-red insect, measuring one- 

 sixth of an inch in length, which inhabits New Zealand. 



In the Issince the prothorax and mesothorax together are 

 somewhat bell-shaped, but much broader than long. The humeral 

 ano-les of the elytra are prominent, the legs not foliaceous, and the 

 antennae short. Issus Coleoptratus, Fabr.. is a small greenish or 

 brownish insect, a quarter of an inch long ; it is not uncommon. 



The Flatince are generally provided with streaks or transverse 

 parallel nervures on the hind margin of the fore wings, and their 

 wino-s fall perpendicularly on each side of the body in repose. 

 Flcdu Limbata,¥3ihY., is a green species from AVe.stern Africa, which 

 measures nearly an inch to the extremity of the closed wings. 



The Tettigometrince are distinguished from all the preceding 

 o-roups by the absence of a raised ridge on the sides of the face. 

 Tettigometra Firescens, Panz., is a common greenish-yellow species 

 with reddish legs, about a quarter of an inch long. 



One peculiarity of the FuJgoridce, to which we have not ]3re- 

 viously referred, is that many of the species exude a white waxy 

 powder, with which they are sometimes completely covered, and 

 which is collected for sale in some parts of China. It is probably 

 analogous to a similar substance exuded by the larvae of some 

 Lrpidnptera, — AUanis Ci/nthia. for example. 



