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



and a little shorter than the body : the eyes are black : the mouth 

 is pale yellow with a black tip : the nectaries are black, and 

 nearly as long as one-fourth of the length of the body : the tube 

 at the tip of the abdomen is pale green : the legs are yellow, and 

 moderately long; the feet and the tips of the shanks are brown. 



2nd var. The body like the last, but with a metallic lustre. 



The viviparous winged female. This, as usual, has a dark colour 

 on the chest, the breast, and some parts of the abdomen. Soon 

 after the middle of the fore-border of the wing its main vein 

 begins to widen rather abruptly into an irregularly spindle-shaped 

 brand : the fourth vein springs from a hardly perceptible angle 

 of this brand, and is moderately curved ; the third vein is obsolete 

 at its source ; it is forked after one-third of its length, and forked 

 again long after two-thirds of its length : in some instances the 

 lower branch and in others the upper branch of the second fork 

 are wanting ; the first vein diverges from the second more than 

 the second diverges from the third. It sometimes contains ten 

 young ones, all of the same size. 



1st var. While a pupa it resembles the wingless insect, but 

 the body is elliptical, the feelers and the legs are darker, the 

 rudimentary wings are pale green. The winged Aphis is black : 

 the borders of the fore-chest are green : the abdomen is dark 

 green : the feelers are black, and shorter than the body : the 

 mouth is black, dark green at the base : the nectaries are black, 

 and as long as one-sixth of the body : the legs are black, and 

 moderately long ; the fore-thighs are yellow at the base : the 

 wings are colourless, and very much longer than the body ; the 

 wing-ribs are pale yellow ; the brands and the veins are brown. 

 Length of the body ^-f line; of the wings If -2^ lines. 



75. Aphis Nymph(R<Ry Linn. 



Aphis NymphcBCBy Linn. Syst. Nat. ii. 714. 10; Faun. Suec. 

 983; Fabr. Ent. Syst. iv. 214. 18 ; Syst. Rhyn. 297. 18; Schrank, 

 Faun. Boic. ii. 1. 117. 1224; Gmel. ed. Syst. Nat. i. 2204; 

 Miiller, Ins. 1264; Turt. ii. 703; Kalt. Mon. Pflan. i. 104. 79; 

 Fonscol. Ann. Soc. Ent. Fr. x. 



A. Butomi, Schrank, Faun. Boic. ii. 114. 1212. 



NymphmfeXy Amyot, Ann. Soc. Ent. Fr. 2**^ serie, v. 478. 



This species feeds on the following water-plants : Nymphcea 

 alba, N. lutea, Alisma Plantago, Butomus umbellatus, Potamo- 

 geton natans, Sagittaria sagittifolia, Utricularia vulgaris, Hydro- 

 cotyle vulgaris, Fontederia cor data, and some other species. It 

 has an unfailing supply of moist and nourishing food, and ac- 

 cordingly seems to multiply more abundantly than any other 

 species. 



The viviparous wingless female. Deep olive-green, shining, and 



