259 
l\lr. F. Walkcr^s Descriptions of Aphides. 
ribs, the wing-brands and the veins are tawny ; the fourth branch- 
vein sends forth its first fork at one-third, and its second fork at 
two-thirds of its length. The young ones in the body sometimes 
amount to thirty in number, of which a third part are large and 
the rest are small. 
1st variety. With four black spots on each side of the abdo- 
men. 
Length of the body 2 — 2^ lines ; of the wings 5 — 6 lines. 
Third Group. 
The only species in this group differs not from A. comes in 
structure, but in addition to the three forms before-mentioned it 
has a fourth, which is the viviparous wingless female. 
5. Aphis oblong a. 
Aphis ohlongay Von Heyden, Stet. Ent. Zeit. Jahr. v. 12 ; Kalt. 
Mon. Pflan. i. 144; Ratz. Forst. Ins. hi. 219; Stet. Ent. Zeit. 
1844, pp. 9, 81, 133, 410. 
The viviparous wingless female. The body is brown : the front 
of the head is slightly concave : the feelers are black, setaceous, 
slightly hairy, and shorter than the body ; the fourth joint is pale 
yellow at the base, and about half the length of the third ; the 
fifth is also pale yellow at the base, and a little shorter than the 
fourth ; the sixth is much shorter than the fifth ; the seventh is 
much shorter than the sixth : the eyes are dark red : the mouth 
is black, yellow towards the base, and reaches to the middle 
hips : the nectaries are shorter than those of A. comes , and do 
not rise above the surface of the abdomen : the legs are dark yel- 
low and slightly hairy ; the thighs, excepting the base, the feet, 
and the hind shanks, are black. It is the prey of a parasitic grub. 
The viviparous winged female. In colour like the preceding 
form, but the disc of the chest and that of the breast are black : 
the wings are colourless ; the wing-ribs, the wing-brands and the 
veins are tawny ; the second fork of the fourth branch-vein is 
•rather long. 
Length of the body I^ line; of the wings 3 lines. 
I am indebted to my friend Mr. Haliday for the following trans- 
lation of an extract from ‘Erichson^s Bericht,^ &c., 1844: — 
Ent. Zeitung, pp. 9, 81, 133, 410. Batzeburg observed a 
species of Aphis on the birch which continued to produce a living 
progeny, from August into winter, without either male or female 
appearing. Bouche and Kaltenbach in explanation remark that 
the males in this family are not always winged. However, the 
May following, Batzeburg, continuing his observations, found 
the winged females, and afterwards (in October) winged males 
also which paired with them. The species was then identified as 
A. ohlonga, V. Heyden.^'’ 
