304 Mr. F. Walker’s Descriptions of Aphides. 
65. Aphis Avellane, Schrank. 
Aphis Avellane, Schrank, Faun. Boic. 112. 1207 ; Kalt. Mon. 
Pflan. 143. 116. 
This species clusters on the stalks and shoots of Corylus Avel- 
lana, whereas A. Coryli is scattered on the leaves of that tree. 
The viviparous wingless female. The body is oval, convex, hairy, 
pale green, and varies in breadth : the front is bristly, and has a 
protuberance in the middle, and one more slight at the inner base 
of each feeler : the feelers are pale yellow and very much longer 
than the body ; the tips of the joints are brown ; the first and the 
second joints are bristly, and the third is also so to a less degree ; 
the fourth joint is a little shorter than the third ; the fifth is as 
long as or longer than the fourth ; the sixth is less than half the 
length of the fifth ; the seventh is more than four times the length 
of the sixth: the mouth reaches the hind hips, or very near thereto, 
and even much beyond them in the young insects : the nectaries 
are green, and full one-fourth of the length of the body; they 
are slightly tapering from the base to the tips: the tip of the 
abdomen does not form a tube: the legs are pale yellow, very 
long and hairy; the shanks are very slightly curved; the fore- 
legs are but little shorter than the hind-legs; the feet and the 
tips of the shanks are brown: the young ones in the body some- 
times amount to twenty or upwards. 
1st var. The feelers are a little shorter than the body ; the fifth 
joint is longer than the fourth; the sixth is full half the length 
of the fifth; the seventh is about one-third of the length of the 
sixth. 
2nd var. The seventh joint of the feelers is about five times 
the length of the sixth. 
3rd var. The body is rose-colour. 
4th var. The body is liac-colour. - 
The viviparous winged female. While a pupa it resembles the 
wingless Aphis in colour: the rudimentary wings are pale 
green, and when they are unfolded, the head and the disc of the 
chest have a darker colour: the wings are colourless, and much 
longer than the body ; the second vein diverges rather more from 
the first than it does from the third; the forks of the latter are 
inconstant in length, and sometimes the situation of their source 
varies in the opposite wings of the same insect ; the fourth vein 
is but slightly curved, and the angle of the brand whence it 
springs is extremely slight. 
Length of the body 1 line; of the wings 3 lines. 
{To be continued. ] 
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