ZOOLOGY. 209 



devouring small insects, and anlmalculae ; like the prece- 

 ding, the pupa has the rudiments of wings, but the larvce is 

 apterous. 



S. Aepa. Water-Scorpion. Snout inflected ; wings four, 

 cross-wise, coriaceous on the upper parts ; fore-feet 

 formed for swimming j the others for walking. 



An aquatic genus, agreeing in habits with the preceding. 



9. Cimex. Buo. Snout inflected ; antennae longer than the 



thorax ; wings four, folded, the upper pair coriaceous 

 at their bases ; back flat, with the thorax margined ; 

 legs formed for running. 



10. Aphis. Plant-Louse. S'/zoM^nflected j an/ewwap longer 



than the thorax ; wings either four, or wanting ; feeC 

 formed for walking; abdomen mostly furnished with 

 two horns or processes. 



There are but few plants that are not subject to the at-- 

 tacks of this minute tribe of animals ; they frequent the^ 

 leaves, stems, young stalks, and buds of plants, and trees r 

 their ceconomy was formerly little understood, but 

 the late Mr. William Curtis, who made this curious 

 family his particular study, has, in a paper published in the 

 sixth volume of the Linnean Transactions, given their history, 

 which is replete with highly interesting information. In this 

 place we shall merely remark, that at an early period of the 

 year, the young are produced alive, at another time, from an 

 ej;j, and that the female once impregnated, continues to pro- 



p 



