46 Mr. F. Walker's Desa-iptions of Aphides. 



course conformable or parallel to the fourth vein, while the direc- 

 tion of its lower division agrees with that of the second vein. 



92. Aphis Tanacetina, n. s. 



The viviparous wingless female. The body is elliptical, convex, 

 yellowish green : the front is slightly convex, not notched : the 

 feelers are setaceous, and rather less than half the length of the 

 body ; the first and the second joints have no angles ; the fourth 

 joint is much shorter than the third, but more than half its 

 length ; the fifth is a little shorter than the fourth, and the sixth 

 has the same proportion to the fifth ; the seventh is nearly as long 

 as the third ; the tips of the joints are brown : the tip of the ab- 

 domen is not compressed, but rounded, and has no tube : the 

 nectaries are linear, and as long as one-sixth of the body : the 

 legs are rather short ; the feet are brown. The young ones which 

 it contains exceed twelve in number. 



The viviparous winged female. It resembles the wingless insect, 

 but is darker abovit the head and about the chest : the feelers are 

 brown excepting the base, and a little shorter than the body : the 

 tips of the nectaries are brown : the wings are colourless and very 

 much longer than the body ; the brand has a distinct angle where 

 it sends forth the fourth vein, and the distance thence to its tip 

 is about one-fifth of its whole length, and less than half the space 

 between the tip of the brand and the tip of the fourth vein : the 

 fourth vein is moderately curved at the base, and nearly straight 

 towards the tip ; the third springs from the brand at one-fifth of 

 the length of the latter, and is forked before one-third and again 

 a little after two-thirds of its length; the second and the third 

 veins are nearer to each other at the base than are the third and 

 the fourth ; the first and the second are still nearer to each other 

 than are the second and the third, but they diverge more before 

 they reach the hind-border. Found in August on Tanacetum 

 vulgare. 



Length of the body f line; of the wings 1^ line. 



Variations in the wing-veins. — 1st var. The third vein has its 

 first fork long after one-third and its second a little after two- 

 thirds of its length. 



2nd var. The third vein sends forth its first fork at half its 

 length, and it has no lower branch to its second fork. 



The oviparous wingless female. This much resembles the vivi- 

 parous wingless female, but the hind-shanks are somewhat wide, 

 and rather darker than the rest. It appears in the middle of 

 October. 



93. Aphis Crat(Egaria, n. s. 



The viviparous wingless female. The body is oval, convex, yel- 

 lowish green, smooth, shining : the feelers are pale yellow, slender. 



