330 Mr. F. Walker's Descriptions oj Aphides. 



The winged male. It pairs with the wingless female at the 

 end of October: it is slender, dull pale greenish yellow, and thickly 

 covered with gray powder : the head, the disc of the chest, and 

 that of the breast are dark gray, and the abdomen has a row of 

 dots on each side and one of short bands along its back of the same 

 colour : the feelers are black, dull yellow at the base, and a little 

 longer than the body : the mouth and the legs are pale yellow ; 

 the former has a black tip ; the knees, the feet, and the tips of 

 the shanks are black ; the hind-legs are dark gi-ay : the wing- ribs 

 are pale yellow, and the wing-brands are pale brown. 



I have counted above twenty young ones of various size in one 

 wingless female, which form, with its winged descendant, abounds 

 from the middle of May till the middle of June. During the 

 following months the species disappears from the beech-leaves 

 with the exception of a very few little Aphides whose growth 

 seems to be retarded. The second epoch of A. Fagi is October, 

 the only season for the assemblage of all its forms, when the vi- 

 viparous and oviparous females and the males swarm together, 

 and this remark will apply to most other species of Aphis. 



Fifth Group. 

 7. Aphis antennata, Kaltenbach, Mon. Pflan. i. 115. 88. 



The viviparous winged female. The body is stout and thick, 

 and of a bright grass-green colour : the head is broad : the front 

 has a small spine in the middle, and a short spine on each side at 

 the inner base of each feeler : the eyes are dark and prominent : 

 the mouth is green, and hardly reaches the base of the middle 

 legs ; its tip is black : the feelers are black, rather stout, and 

 much longer than the body ; the first and the second joints are 

 green, and rather thick ; the fourth joint is shorter than the third ; 

 the fifth is longer than the fourth ; the sixth is hardly one-fourth 

 of the length of the fifth ; the seventh is slender, setaceous, and 

 longer than any of the preceding joints : the nectaries do not 

 rise above the surface of the abdomen : the legs are long, green, 

 pubescent, and rather stout; the shanks are rather darker and 

 much longer than the thighs ; the hind shanks are nearly twice 

 the length of the hind thighs ; the knees and the tips of the feet 

 are darker than the shanks : the wings -are colourless and much 

 longer than the body ; the wing-brand is black and nearly half 

 the length of the whole wing ; the veins are brown ; the third 

 branch is divided before one-third, and subdivided before two- 

 thirds of its length. 



Length of the body 1| line; of the wings 5^ lines. 



The viviparous wingless female. Dark brown, broad, short. 



