Mr. F. Walker^s Descriptions of Aphides. 255 



long ; the fourth is a little shorter than the third ; the fifth is a 

 little shorter than the fourth, and very slightly dilated at the tip ; 

 the sixth is spindle-shaped, and from one-fifth to one-sixth of the 

 length of the fifth ; the seventh is longer than the fifth : the mouth 

 is pale yellow ; its tip is brown : the eyes are red : the disc of the 

 chest and that of the breast are brown ; the sides of the chest are 

 pale brown : there are two dark brown bands across the middle 

 of the disc of the abdomen, and two dots of the same colour be- 

 tween the hindermost band and the nectaries ; these are brown, 

 and more than one-fourth of the length of the body, and at the 

 base of each there is a small black spot : the legs are yellow and 

 slender ; the fore-thighs and the hind-thighs are shaded with 

 brown ; the knees and the tips of the feet are black ; each fore- 

 thigh has a very slight tooth on the inner side of its tip : the 

 wings are colourless, and much longer than the body ; the wing- 

 brands are very pale ; the veins are bufi^, and in form are alike to 

 those of A. Platanoidis. 



1st variety. The feelers are nearly twice the length of the body. 



2nd var. The seventh joint of the feelers is not longer than 

 the fifth. 



The number of young in the body does not usually amount to 

 twelve ; they are occasionally more numerous, but in that case 

 some of them are extremely small. This female is the prey of a 

 species of Aphidius. 



The oviparous wingless female. This is spindle-shaped, and in 

 form much resembles the oviparous A, Platanoidis ; it occurs from 

 the beginning till the end of October. Its colour is buff or yel- 

 low ; the tips of the joints of the feelers, the tip of the mouth, 

 the lobes of the chest, the tips of the nectaries, the knees, and 

 the feet are brown ; there are also five or six interrupted brown 

 bands across the abdomen, increasing in distinctness till the last, 

 which is usually entire : the eyes are dark red. 



1st variety. The tips of the joints of the feelers, the knees and 

 the feet are black. 



The winged male. Much resembles the winged female, but is 

 somewhat darker ; it pairs with the oviparous female before the 

 end of October. 



Length of the body 1^ line; of the wings 3 lines. 



Second Group. 

 Like the first group, but the nectaries hardly rise above the 

 surface of the abdomen, and the seventh joint of the feelers is 

 shorter than the sixth. 



3. Aphis Betula. 

 Aphis Betula, Linn. Syst. Nat. ii.735.21; Faun. Suec. 992; 

 Fabr. Sp. Ins. ii. 386. 20; Ent. Syst. iv. 215. 25 ; Syst. Rhyn. 



