270 Mr. F. Walker’s Descriptions of Aphides. 
El. ii. 111; Turt. ii. 706; Shaw, Gen. Zool. vi. pl. 58; Kalt. 
Mon. Pflan. i. 72. 52. 
A. Pomi, Deg. Ins. i. 36. pl. 3. fig. 18-21; Latr. Gen. Cr. 
il. 178. 
A. Oxyacanthe, Schrank, Faun. Boic. i. 116.1219. 
Oxyacanthaphis, Amyot, Ann. Soc. Ent. Fr. 24 série, v. 478. 
This species feeds on Pyrus malus, P. communis, Cydonia vul- 
garis, Mespilus germanica, Sorbus aucuparia, and Crategus oxy- 
acantha. 
When very young, and in the middle of March, it has a dark 
green colour: the head and the limbs are still darker: the eyes 
are dark brown: the feelers are half the length of the body : the 
mouth reaches to the hind-hips: a dark stripe runs along each side 
of the body : the nectaries are about one-eighth of its length: the 
legs are rather short and stout : it dwells on the buds with the pale 
orange young ones of Psylla Pyri. When full-grown it is green, 
shining, oval, and convex: the limbs are brownish green: the feelers 
are setaceous, rather stout, brown, pale green at the base, and less 
than half the length of the body: the legs are pale green; the 
feet are brown: the front is broad and convex, and there are no 
tubercles at the base of the feelers; the first and the second 
joints of the latter are not angular; the fourth joint is much 
shorter than the third ; the fifth is a little shorter than the fourth ; 
the sixth is a little shorter than the fifth ; the seventh is slender, 
and rather shorter than the third. 
Ist var. The body is pale yellowish green with three vivid 
green stripes. 
2ud var. The body is grass-green, varied with yellow towards 
the head: the limbs are pale yellow: the feelers are one-third of 
the length of the body: the nectaries are one-twelfth of the length 
of the body. 
3rd var. The body is green; the limbs excepting the tips of 
the feelers are paler. 
4th var. The body is green: the feelers are pale green, and 
very much shorter than the body: the nectaries are green, and 
from one-fourth to one-fifth of the length of the body : the mouth 
is green; its tip and the eyes are black: the legs are pale green 
with brown feet. 
5th var. The feelers are shorter than the body, and the nec- 
taries equal one-tenth of its length. 
6th var. The body is pale green: the feelers are pale brown, 
pale green at the base, and rather more than half the length of 
tke body: the eyes are dark brown; the mouth is pale green 
with a darker tip: the nectaries are less than one-twelfth of the 
length of the body: the legs are pale green, and rather short ; 
the feet and the tips of the shanks are brown. 
