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



XXXVI. — Descriptions of British Aphides. 

 By Francis Walker, F.L.S. 



[Continued from p. 281.] 



82. Aphis Pruni. 



Aphis Pruni, Fabr. Ent. Syst. iv. 213. 14; Syst. Rhyn. 296. 

 14; Gmel. ed. Syst. Nat. i. 2202; Geoffr. Ins. i. 497. 10: De- 

 geer, Ins. hi. 49. 5. t. 2. f. 1-8; Reaum. Ins. hi. t. 23. f. 9-10; 

 Scopoli, Ent. Carn. 138. 406; Rossi, Faun. Etr. 260. 1374; 

 Stew. El. h. 110; Turt. h. 704; Schrank, Faun. Boic. h. 115. 

 1217; Gotze, Ent. Beitr. h. 312; Latr. Gen. Cr. hi. 173; St. 

 Farg. et Serv. Encycl. x. 245 ; Kaltenbach, Mon. Pflan. i. 52. 37 ; 

 Ratz. Forst. Ins. hi. 216. 



A. Arundinis, Fabr. Syst. Ins. 385. 7; Ent. Syst. iv. 212. 8; 

 Syst. Rhyn. 295. 8; Gmel. ed. Syst. Nat. i. 2202; Kalt. Mon. 

 Pflan. i. 54. 38. 



Prunifex, Amyot, Ann. Soc. Ent. Fr. 2 de serie, v. 476. 



Calamaphis, Amyot, Ann. Soc. Ent. Fr. 2 de serie, v. 477. 



The viviparous wingless female. This Aphis dwells beneath the 

 leaves of the plum-tree (Prunus domestica), and is said to feed also 

 on P. spinosa and on P. Armeniaca, from the middle of June 

 to the end of October. It exudes much floccose matter with 

 which the leaves on which it feeds are covered ; the body is light 

 green, elliptical, long, narrow, and thickly covered with white 

 powder : the limbs are white : the feelers have brown tips, and 

 are much shorter than the body : the tip of the mouth, the feet, 

 and the tips of the shanks are brown, and the eyes are darker : 

 the nectaries are pale green with black tips, and about one- 

 twentieth of the length of the body : the front is rather narrow, 

 and nearly straight : the first and second joints of the feelers are 

 not angular; the fourth joint is very much shorter than the 

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

 much shorter than the fifth ; the seventh is more than twice the 

 length of the sixth. It also sometimes appears in abundance on 

 Arundo Phragmitis and on A. Epigyos, and it assumes there a 

 variety of tints, which will be mentioned when its history is more 

 fully detailed. 



The viviparous winged female. The pupa much resembles the 

 larva, but is shorter, and the tips of the rudimentary wings are 

 pale brown. The winged Aphis is also light green, and very 

 much covered with white powder : the head, the middle chest, 

 and the middle breast are black or gray : the feelers have the 

 same colours, and varj in length, being a little shorter or much 

 shorter than the body; the fourth joint is more than half the 

 length of the third; the fifth is shorter than the fourth; the 

 sixth is much shorter than the fifth ; the seventh is more than 



