38 BRITISH APHIDES. 



Body long, bright green or yellowish green, narrow 

 across the thorax. Abdomen, in the adults, spotted 

 with green in longitudinal rows, broadest on the 

 tergum. Cornicles mere tubercles, which scarcely rise 

 above the general surface. AntennsB greenish yellow, 

 and equally stout throughout; the last joint has a 

 process which Koch and some others regard as a true 

 joint. Eyes large and red. 



The insect, during the summer, conceals itself from 

 observation by means of a quantity of white silky 

 material spun from pores spread on the thorax, and 

 more plentifully on the abdominal rings. This 

 cottony matter occurs in long flocks, which extend 

 beyond the tail, and make the insect apparently double 

 its real size. These insects crowd under the leaves of 

 the common beech, Fagiis sylvestris, and render them 

 hoary with this cottony mass.* Occasionally this accu- 

 mulates into resinous lumps, which have a sweetish 

 flavour on the tongue. Young specimens are but little 

 clothed, and, singularly, towards November the adults 

 spin less of this flocculent material. 



Winged viviparous female. 



Head and thorax rather slender. Abdomen long 

 oval. Colour yellowish green. Head, prothorax, and 

 thoracic lobes black. Eight or more broad bands and 

 as many lateral spots mark the abdomen. Legs and 

 antennae black. The latter spring from inconspicuous 

 frontal tubercles. The sides and apex of the abdomen 

 are garnished with long flowing flocks as in the wing- 

 less female. Anal plates unmarked. 



* As this substance is soluble in ether, it has more the character of 

 wax than either siik or cotton. Coccus, an allied family, as is well 

 known, produces both resin (lac) and wax (Cbiuese wax). 



