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of this brand, and is moderately curved ; the third vein is obsolete 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 contaims 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 3-3 line; of the wings 13-21 lines. 
75. Aphis Nymphee, Linn. 
Aphis Nymphee, Linn. Syst. Nat. 1. 714. 10; Faun. Suee. 
9838; Fabr. Ent. Syst. iv. 214. 18; Syst. Rhyn. 297. 18; Schrank, 
Faun. Boic. i. 1. 117. 1224; Gmel. ed. Syst. Nat. 1. 2204; 
Miller, Ins. 1264; Turt. 1. 703; Kalt. Mon. Pflan. i. 104. 79; 
Fonscol. Ann. Soc. Ent. Fr. x. 
A. Butomi, Schrank, Faun. Boic. ii. 114. 1212. 
Nympheifex, Amyot, Aun. Soc. Ent. Fr. 24 série, v. 478. 
This species feeds on the following water-plants : Nymphea 
alba, N. lutea, Alisma Plantago, Butomus umbellatus, Potamo- 
geton natans, Sagittaria sagittifolia, Utricularia vulgaris, Hydro- 
cotyle vulgaris, Fontederia cordata, 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 
