22 BRITISH APHIDES. 



Winged viviparous female. 



Incli. Millimetres. 



Expanse 0*260 6-60. 



Size of body O'OOOxO'OSO 2-27 X 0-76. 



Length of antennae 0"085 2"14. 

 „ cornicles very small. 



Pale green or light yellow. Antennae at least equal 

 in length to the body, ringed with black. Seventh 

 joint about equal to the sixth. Nectaries green, some- 

 times tipped with brown. Abdomen occasionally 

 obscurely barred with brown, and furnished on the 

 dorsum with six pointed tubercles disposed in two 

 rows, unobserved by Koch. Rostrum very short, not 

 reaching to the second coxse. 



This species is common on the sessile oak, Quercus 

 sessiliflora from spring to October. I have taken it 

 feeding also on QuercAis ilex ; and Walker observed it 

 on the American chestnut, Gastanea pumila. They 

 form small companies of four or six under the same 

 leaf, and they intermix with the next species, GalUjjte- 

 rus querceus, and Thelaxes (Facuna) dryophlla. 



The young are nearly white or colourless, with eyes 

 more or less spotted ; by age these last organs become 

 red. 



Apterous oviparous female. 



Inch. Millimetres. 



Size of body O'OSO x 0*045 2*02 X 1-13. 



Fine yellow or salmon-colour, with greenish dorsal 

 stains, which dilate near the tail. Body ringed, tuber- 

 culate, and hirsute. Eyes spotted with brown. 

 Geneto-anal rings obtuse and rounded. Rostrum as 

 with the other forms. 



Taken at the end of November whilst ovipositing 

 on a dry leaf. They, however, will oviposit also in the 

 middle of October. 



As these leaves fall to the ground, it is probable that 



