Mr. F. Walker^s Descriptions of Aphides. 45 



long as one-fourth of the body ; the thighs excepting the base 

 are black. 



2nd var. The nectaries are yellow with black tips. 



57. Aphis Avena, Fabr. 



Aphis Avena, Fabr. Sp. Ins. ii. 386. 17; Syst. Ent. 736. 15, 

 Ent. Syst. iv. 314. 21 ; Syst. Rhyn. 297. 21 ; Gniel. ed. Syst. 

 Nat. i. 4. 2206. 5; Vill. Ins. 551. 50; Schrank, Faun. Boic. 

 ii. 1. 104; Stewart, ii. 110; Macq. Ann. Sci. Nat. 1831, 468; 

 Kalt. Mon. Pflan. i. 108. 6. 



A. granaria, Kirby, Linn. Trans, iv. 238 ; Curtis, Journ. R. 

 Agric. Soc. vi. 



A. Hordei, Kyber, Germ. Mag. 



A. cerealis, Kalt. Mon. Pflan. i. 16. 6. 



Bromaphis, Amyot, Ann. Soc. Ent. 2"^^ serie, v. 479. 



This kind feeds on Secale cereale, Triticum cestivum, &c., Avena 

 sativa, Danthonia strigosa, Hordeum vulgare, H. ynurinum, Bromus 

 mollis, B. secalinus, Dactijlis glomerata, Holcus lanatus, Glyceria 

 fluitans, Poa annua, and on other grasses, and also on Polygonum 

 Pei'sicaria. 



The viviparous wingless female. When young it is dull pale 

 yellow : the feelers are shorter than the body : the mouth has a 

 black tip, and reaches the base of the hind-legs : the nectaries 

 have also black tips, and are as long as one-sixth of the body. 



1st var. The body is red. 2nd var. The body is dull green : 

 the hind-part of the abdomen is red. 



When full-grown it is red : the feelers are black, and very 

 nearly as long as the body ; the fourth joint is more than half 

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

 the sixth is hardly one-third of the length of the fifth ; the seventh 

 is a little longer than the third, and about five times the length of 

 the sixth : the front is convex in the middle, and has a very di- 

 stinct lobe on each side, or in other words it is somewhat undu- 

 lating, and has a projection in the middle and one on each side : 

 the eyes and the mouth are black : the tip of the abdomen is com- 

 pressed and curved : the nectaries are black, very slightly curved 

 and tapering towards their tips, and between one-fourth and 

 one-fifth of the length of the body : the legs are dull yellow and 

 moderately long ; the knees, the feet, and the tips of the shanks 

 are black ; the shanks are very slightly curved ; the fore-legs are 

 not very much shorter than the hind-legs. 



1st var. The body is green, and varieties also occur with every 

 tint between this colour and red. 



2nd var. The disc of the body is blackish. 



3rd var. The legs are bright pale yellow. 



4th var. The thighs are black from near the base to the tips. 



