106 Mr. F. Walker's Descriptions of Aphides. 



brown, yellowish white towards the base : the mouth is pale yel- 

 low with a black tip, and full as long as the body : the nectaries 

 are black, the thighs, except the tips, and the shanks near the 

 base, are pale yellow : sometimes the legs are yellow with the ex- 

 ception of the knees and of the feet. 



The viviparous winged female. In colour it resembles the wing- 

 less insect, but the feelers are quite black : the wings are colour- 

 less and very long, their length much exceeding that of the 

 body ; the wing-ribs are dark red ; the veins and the wing-brands 

 are dark brown ; the wing- vein begins to widen into the brand 

 at about half the length of the wing ; the brand is long and linear, 

 the angle at its tip is very obtuse, and its termination is much 

 more gradual than that of most other species of this group ; the 

 fourth vein is very slightly curved ; the third vein is almost ob- 

 solete at its source, and is forked a little after one-third and 

 again a little before two-thirds of its length, so that the two forks 

 are near together; the first and the second veins are nearly 

 straight, and, as is usual in this group, they are much nearer 

 each other at the base than at the tips. 



Length of the body 2^-3 lines ; of the wings 7 lines. 



This species frequents willow-trees in the autumn. Mr. Wing 

 observed it in great abundance on the shoots from the middle of 

 September to the end of October in 1846 ; and he remarked that 

 its honey-dew is very attractive to moths, among which Nonagria 

 crassicornis, which very seldom touches sugar, was plentiful. 



This fact has also been remarked in France, and is mentioned 

 in the * Annales de la Societe Entomologique/ vol. vi. 



43. Aphis Roboris, Linn. 



Aphis Roboris, Linn. Syst. Nat. ii. 735. 22 ; Faun. Suec. 993 ; 

 Fabr. Ent. Syst. iv. 218. 42; Syst. Rhyn. 300. 42; Schrank, 

 Faun. Boic. ii. 1. 113. 1209; Gmel. ed. Syst. Nat. i. 2207; 

 Fonscol. Ann. Soc. Ent. Fr. x. 183. 26. 



Aphis longipes, Leon Dufour, Rech. sur les Hemipt., Mem. de 

 FInst. iv. 243. t. 9. f. 116, 117. 



Cinara Roboris, Curtis, Brit. Ent. xii. 576. 



Lachnus Roboris, Kalt. Mon. Pflan. i. 148. 2. 



Dry aphis, Amyot, Ann. Soc. Ent. Fr. 2 me serie, v. 481. 



The viviparous wingless female. This appears on the twigs and 

 young branches of the oak in the beginning of July. When very 

 young it is dull green or pale red, linear, narrow, and shining : 

 the feelers are much less than half the length of the body ; their 

 tips are darker : the mouth is a little longer than the body ; its 

 tip and the eyes are black : the knees, the feet, and the tips of 

 the shanks are also black. When half-grown the body is dark 

 brown, flat, and rather narrow, and has a broad red band across 



