19 i Mr. F. Walker^s Descriptions of Aphides. 



than the body, and pale yellow from the middle till near the 

 base : the mouth is pale green ; its tip and the eyes are black : 

 the nectaries are also black, and as long as one-third of the 

 body : the legs are pale yellow ; the feet and, the tips of the 

 thighs and of the shanks are black. 



13th variety. The body is green : the head is blackish green : 

 the tip of the abdomen is pale greenish yellow : the feelers are 

 black, and much longer than the body : the mouth is yellow ; its 

 tip and the eyes are black : the nectaries are black, and as long as 

 one-third of the body : the thighs are pale green, black towards 

 their tips ; the shanks are dull yellowish green ; their tips and 

 the feet are black. 



14th variety. Like the preceding, but the head is buff : the 

 legs are black ; the thighs are pale yellow for two-thirds of their 

 length from the base. 



When the wingless female has just shed its skin, it has a pale 

 green colour ; the head and the limbs are white, and the joints 

 of the latter have brown tips. There are two or three short seg- 

 ments at the base of the abdomen beneath ; the rest are longer. 

 Formica nigra, the little black ant, often resorts to this species 

 to feed on its honey, and the viviparous females are the prey ex- 

 ternally oiHemerobii and Syrphi, and internally oiAphidius Rosa, 

 Allotria erythrocephalaj Ceraphron Carpenterij Asaphes miea, Co- 

 ryna clavata, Cyrtogaster vulgaris, and Encyrtus Atheas. 



The colonies of this Aphis while feeding on the teasel are fre- 

 quented by Formica rufa ; this large black and red ant does not 

 come within the precincts of gardens, but is replaced there by 

 the small black ant as before mentioned. 



The viviparous winged female. Its wings in mild weather are 

 sometimes unfolded as early as the 24th of March : the head and 

 the feelers are black, and the latter are as long as the body ; the 

 fourth joint is much shorter than the third ; the fifth is hardly 

 shorter than the fourth ; the sixth is about one-third of the length 

 of the fifth ; the seventh is nearly as long as the third : the eyes 

 are dark red : the mouth is dull green with a brown tip : the 

 chest and the breast are dull olive-green ; their sides are pale 

 green : the fore-chest has a bright green band on its hind-bor- 

 der : the abdomen is grass-green with a row of black spots on 

 each side : the nectaries are black, shining, and as long as one- 

 fourth of the body : the legs are long and yellow ; the thighs 

 from the middle to the tips, the knees, the feet, and the tips of 

 the shanks are black : the wings are colourless, and much longer 

 than the body ; the wing-ribs and the rib-veins are bright straw- 

 colour; the veins are brown. 



1st variety. Of a delicate pink colour mottled with yellow. A 

 pupa. 



