110 BRITISH APHIDES. 



coat or cotton-like down, under whicli tlie insects, in 

 many cases, conceal themselves. 



Some species of this genus are very destructive to 

 vegetation, and during some seasons render our 

 orchards unproductive. 



The chief character to be observed in this genus, as 

 contrasted with Aphis, is the shortness of the tail and 

 nectaries, and the oval and often linear forms of the 

 bodies. 



Hyalopteeus pruni, Fahr. Plate LXXY, figs. 1 — 3. 



Ajyhis primi, Fabr., De Geer, Schr., Reaum. 



— — Kollar, Kalt., Walk. 



— — jjrunifex, Amyot. 

 Hyalo^terus pruni, Koch, Pass. 



Apterous viviparous female. 



Inch. Millimetres. 



Size of body 0-085X0-042 2-14Xl'06. 



Length of antennse 0*060 1*52. 



cornicles O'OOo 0*12. 



Long oval ; rather flat ; pale green, with darker green 

 mottling. Back usually has a darker dorsal stripe ; 

 more or less dusted with a white meal-like powder. 

 Under side green. Eyes dark brown. Cornicles small, 

 perhaps shorter than the cauda, which is green. 

 Cornicles and tarsi black. 



Winged viviparous female. 



Incli. Millimetres. 



Expanse of wing 0*240 6*09. 



Size of body 0-075x0'027 l-89x0'67. 



Length of antennse 0*055 1*39. 



cornicles 0*005 0*12. 



Smaller and more linear than the larva. Bright 



