448 Mr. F. AYalker^s Descriptions of Aphides. 
slender, setaceous, hairy, and as long as the body ; the fourth 
joint much shorter than the third ; the fifth is a little shorter 
than the fourth ; the sixth increases in breadth from the base to 
the tip, and is not half the length of the fifth ; the seventh is as 
long as the sixth, and much more slender than the preceding 
joints : the front of the head is nearly straight, and has no tuber- 
cles : the tip of the mouth is brown, and reaches the middle hips : 
the sides of the fore- chest are convex : the nectaries are about 
one-twentieth of the length of the body : the wings are colourless ; 
the veins and the wing-brands are pale brown; the rib-veins 
widen into the brands which are irregularly spindle-shaped, and 
form on the hind-border a scarcely perceptible angle from whence 
springs the fourth vein ; the first and the second veins are nearly 
straight; the third vein is slightly inclined inwards, and forms two 
very obtuse angles where it throws off its forks ; the first fork 
begins after one-third, and the second fork before two-thirds of 
the length of the wing ; the two forks are sometimes much nearer 
to each other in one wing than in the other : the legs are yellow, 
and moderately long ; the shanks are very slightly curved, and 
rather hairy; the tips of the feet are brown. 
Length of the body \\ line ; of the wings 3 lines. 
July, on the oak, near London. 
Eleventh Group. 
21. Aphis Aceris. 
Aphis Aceris y Linn. Syst. Nat. ii. 7361 ; Faun. Suec. 999 ; 
Fabr. Syst. Ent. 735. 9 ; Sp. Ins. ii. 385. 10 ; Ent. Syst. iv. 211. 
11 ; Syst. Rhyn. 295. 11 ; Gmelin, ed. Syst. Nat. i. 2208; Geoffr. 
Ins. i. 495. 5 ; Reaum. Ins. iii. 281-350. t. 22. f. 6-10; Scopoli, 
Ent. Cam. 137. 397 ; Enc. Meth. i. t. 116. f. 6; Rossi, Faun. 
Etrusc. 260. 1372 ; Schrank, Faun. Boic. ii. 1. Ill; Fonscolombe, 
Ann. Soc. Ent. x. 173. 13 ; Kaltenbach, Mon. Pflan. i. 125 ; 
Ratzeburg, Forst. Ins. iii. 218. 
Acerifex, Amyot, Ann. Soc. Ent. Fr. 2“^® serie, v. 479. 
This species abounds on the different species of maple, such as 
Acer Pseudo-platanus, the sycamore; A. Platanoides, the plantain- 
like or Norway maple; A. campestrCy^e^ field maple; A.opali- 
folium, the guelder rose-leaved maple; A. Monspessulanum, the 
Montpelier maple ; A. tataricum, Tartarian maple ; A. Negundo, 
ash-leaved maple. 
The egg-born viviparous wingless female. It is hatched in the 
middle of February or later, and is then very small, black, bristly, 
linear, or slightly increasing in breadth towards the tip of the 
abdomen : the limbs are short and thick : the mouth reaches a 
little beyond the tip of the abdomen, a character retained through 
