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



than one- third of the length of the body ; the seventh joint is 

 longer than the fifth : the wings are colourless ; the veins and the 

 wing-brands are brown ; the rib-vein is rather broad, but widens 

 into a rather narrow brand ; the first and the second veins are 

 nearly straight j the third is obsolete at its source, and is very 

 slightly inclined inwards ; it is forked soon after one-third, and 

 again at two-thirds of its length ; the fourth vein is nearly 

 straight : one wing of the only specimen that I have seen has 

 no second fork. 



The oviparous wingless female. This appears in the autumn ; 

 it is green, and very much resembles the viviparous female : the 

 feelers are a little more than one-fourth of the length of the body. 



The wingless male. It is dull dark yellow, blackish above, and 

 especially towards the tip of the abdomen : the feelers are black, 

 yellow at the base, and more than half the length of the body : 

 the legs are dull yellow ; the feet are black. In other characters 

 it resembles the female. 



Length of the body J-l line ; of the wings 2 lines. 



Kaltenbach observes that this species feeds also on Poa annua, 

 annual meadow-grass, Phalaris arundinacea, and Juncus lampo- 

 carpus, shining-fruited rush, &c. 



27. Aphis littoralis, n. s. 



This species is very abundant in the autumn on the grass of 

 the muddy sea-shore near Lancaster, and the following descrip- 

 tion is from specimens found on that plant. 



The viviparous wingless female. The body is rather flat, some- 

 what long and narrow, dark green, sometimes but very rarely 

 pale green, not hairy nor bristly, but clothed with a white velvet- 

 like down ; it increases slightly in breadth from the head to the 

 tip of the abdomen : the feelers are filiform, yellow, black towards 

 the tips, and about one -fifth of the length of the body : the mouth 

 is dull green with a black tip : the legs are dull yellow, and very 

 short ; the feet are black : all the segments of the body are di- 

 stinct, transverse, and of nearly equal size : it moves slowly, and 

 has much resemblance to the preceding species, whose body how- 

 ever is hairy. 



The oviparous wingless female. I have not yet observed any 

 outward difference between this and the preceding form. 



The wingless male. It appears with the oviparous female at 

 the end of October, but is comparatively scarce : the body is 

 brown, and slightly increases in breadth from the head till near 

 the tip of the abdomen : the feelers are about half the length of 

 the body, and are shorter than those of the darker brown male 

 of A. Glyceric, whose nectaries moreover rise a little above the 

 surface of the body, whereas in this species they are even with 



