Mr. F. Walker's Descriptions of Aphides. 301 



stripe along the back, or a white stripe with a black line on each 

 side of it : the feelers are pale yellow, pale green at the base, 

 black towards the tips, and much shorter than the body : the 

 rudimentary wings are pale green : the mouth is pale yellow ; its 

 tip and the eyes are black : the nectaries are nearly as long as 

 one-sixth of the body ; their tips are black : the legs are pale 

 yellow ; the thighs are pale green ; the tips of the feet are black. 



The oviparous wingless female. The body is pale yellow, ellip- 

 tical, and convex : the abdomen is lengthened behind : the feelers 

 are black towards their tips, and a little shorter than the body ; 

 the tip of the mouth and the eyes are black : the nectaries have 

 black tips, and are as long as one-fourth of the body : the knees, 

 the feet and the tips of the shanks are also black. 



1st var. The body is red : the limbs are pale yellow : the feel- 

 ers are black towards their tips, and as long as the body : the 

 tip of the mouth and the eyes are black : the nectaries have black 

 tips, and are as long as one-fourth of the body : the feet and the 

 tips of the shanks are black. 



Length of the body 1 line ; of the wings 2^ lines. 



63. Aphis Ahietina, n. s. 



The viviparous wingless female. This is oval, green, convex, 

 rather dull, and half a line in length : the head and the limbs 

 are paler and sometimes tinged with yellow : the front jof the 

 head is convex in the middle, but concave on each side, from 

 whence there is a small protuberance extending to the base 

 of the feelers : the feelers are broji^n towards the tips and 

 about half the length of the body; the inner side of the first 

 joint is convex, and has no process; the fourth joint is more 

 than half the length of the third; the fifth is much shorter 

 than the fourth; the sixth is a little shorter than the fifth; 

 the seventh is longer than the sixth : the eyes are dull red : 

 the tip of the mouth is brown : the nectaries have brown tips, 

 and are about one-fourth of the length of the body, which has a 

 slight rim on each side of the back : the legs are moderately long ; 

 the knees, the feet, and the tips of the shanks are brown. The 

 young ones are as usual narrow, flat, and linear, and have short 

 white limbs. 



In 1846, a year remarkable for the mildness of the winter and 

 of the spring, it had attained its full size before the end of 

 January, and was very abundant near London beneath the leaves 

 of the spruce- firs, some of which were stripped of their foliage 

 in consequence of its attacks. It does not disappear before the 

 latter part of November. 



The viviparous winged female. This form comprises the second 

 generation, and in 1846 its wings were unfolded before the end 



