448 Mr. F. Walker's Descriptions o/ Aphides, 



slender, setaceous, hairy, and as long as the Ijody ; 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 tw^o 

 very obtuse angles where it throws ofi" 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 1| line ; of the wdngs 3 lines. 



July, on the oak, near London. 



Eleventh Group. 

 21. Aphis Aceris. 



Aphis Aceris, Linn. Syst. Nat. ii. 7361 ; Faun. Suec. 999 ; 

 Fabr. Syst. Ent. 735. 9 ; Sp. Ins. ii. 385. 10 ; Ent. Syst. iv. 211. 

 11 ; Svst. Rhyn. 295. 11 ; Gmelin, ed. Syst. Nat. i. 2208 ; Geofi"r. 

 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 difierent species of maple, such as 

 Acer Pseudo-platanus, the sycamore; A. Platanoides, the plantain- 

 like or Norway maple; A. campestre, the 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 



