HEMIPTERA : APHID^. 439 



duce a waxy secretion, and the Chinese collect this for 

 the manufacture of the white wax so highly esteemed in 

 the East Indies. 



CERCOPID^E, Leach, OR TREE-HOPPER* FAMILY. This 

 extensive Family compris- Fig. 334 . 



es hemiptera homoptera of 

 small size, well fitted for 

 leaping, and which are 

 found amongst plants and 



, -i r Two-spotted Tree-hopper, Membracis 



on trees, upon the sap of bimacidata, Fabr. 



which they subsist, imbibing such quantities, in many 

 cases, that it oozes out of their bodies continually in the 

 form of little bubbles, and covering the insect entirely in 

 a mass of frothy matter or foam. Many of them are re- 

 markable for their singular and even grotesque shapes. 

 They are known as Tree-hoppers and Frog-hoppers. Figs. 

 334 and 335 represent one species, the first being an en- 

 larged profile view, the other of the natural size. 



APHID^, Leach, OR APHIS FAMILY. This Family 

 comprises hemiptera homoptera which have the body 

 short, and furnished at the hind extremity with two lit- 

 tle tubes or pores, from which exude minute drops of a 

 very sweet fluid. Their upper wings are Fig. 33 6. 



much longer than the body, about twice 

 as large as the lower ones, nearly trian- 

 gular, and, when at rest, almost vertical. 

 Aphides, or Plant-lice, inhabit all kinds Aphis " 4 ' "^ Harr 

 of plants, the leaves and softer portions being often com- 

 pletely covered with them. The young are hatched in the 

 spring, and soon come to maturity, and, what is remarkable, 

 the whole brood consists of wingless females ; and what 

 is still more remarkable, these females bring forth living 

 young, each female producing fifteen or twenty in a day. 

 These young are also- wingless females, and at maturity 

 bring forth living young, which are also all wingless fe- 



