134 BRITISH APHIDES. 



Cubitus, stigma, and wing-veins broMaiisTi. Hind 

 wing witli a single oblique vein.* 



Oviparous female. 

 Size . . . 0-027 X 0-020 mm. 



Very small, globular. AntennsD only partially deve- 

 loped, and composed of four joints. Rostrum none. 

 Eyes minute, and sliowing but seven or eight facets. 

 Legs short. The abdomen is occupied almost exclu- 

 sively by one large egg ; indeed, this insect may be 

 regarded as httle more than a walking seed, which is 

 capable of choosing its own place for deposit. 



The first winged forms issue from the galls about 

 the last week in June. One of these, captured whilst 

 flying, appeared like a small fleck of white down. It 

 was placed under a watch-glass for after examination ; 

 but during the night she produced upwards of thirty 

 young ones, all of which possessed remarkably long 

 rostra, which trailed behind them whilst walking. 

 One of these insects is represented in Plate CXIV, 

 fig 10. 



On cutting open a pedunculated gall, on June the 

 11th, the single Aphis was turned out. She was pale 

 green, with a brown head, legs, and eyes. Two 

 moulted skins were found at the end of the gall, 

 together with an abundance of woolly matter. This 

 Queen-mother was perpetually engaged in wriggling 

 from side to side, and pricking the inside of the gall 

 with her rostrum. 



The leaves viewed from the underside show oblong 

 orifices or slits at the junction of the peduncle. These 

 ventilating slits are partially closed by a dense fringe 

 of jointed threads, which doubtless prevents the 

 entrance of many a prying parasite. The cells were 

 full of winged insects on the 20th of July. 



* I have captured winged females liaving not more than one third of 

 the above measurements . Probably these vs'ere of the second series, 

 which occurs in autumn. 



