Mr. F. Walker's Descriptions of Aphides. 429 



the first and the second joints are dull reddish green, or pale red ; 

 the base of the third joint is almost white : the nectaries are pale 

 yellow with brown tips : the wings are colourless ; the wing-ribs 

 are pale green, or almost white ; the brands are dull yellow or pale 

 brown ; the veins are brown ; the third vein is as usual obsolete 

 at its source ; it is slightly curved, and forms two very obtuse 

 angles where it casts off its forks; the distance between these 

 forks is variable; the first begins before one-third, the second 

 before or after two-thirds of the length of the wing ; the third 

 and the fourth veins sometimes run very near together, but are 

 usually more diverging. 



52. Aphis Vincce, n. s. 



The structure of this species very much resembles that of A. 

 Urtica ; it is rather smaller ; the feelers, especially the seventh 

 joint, are shorter ; the tubercles at their base are less developed ; 

 the nectaries are also a little shorter. It is abundant on Vinca 

 major , the greater periwinkle, in the month of May near London. 



The viviparous wingless female. The body is pale green, oval, 

 convex, smooth and shining : the feelers are very pale, longer 

 than the body ; the tips of the joints are brown ; the fourth joint 

 is shorter than the third; the fifth is shorter than the fourth; 

 the sixth is less than one-third of the length of the fifth ; the 

 seventh is longer than the third : the eyes are dark brown : the 

 mouth is pale yellow with a brown tip : the nectaries are pale 

 green with brown tips, and about one-fifth or one- sixth of the 

 length of the body : the legs are pale yellow, long and slender ; 

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



The viviparous winged female. This much resembles the pre- 

 ceding form, but presents the usual difference in structure, and 

 in the darker colour of the head, of the chest, of the breast, and 

 of the feelers. 



53. Aphis Malva, Sir Oswald Mosley. 



Aphis Malvcs, Sir Oswald Mosley, Gard. Chron. i. 684. 



A. Pelargonii, Kalt. Mon. Pflan. i. 21. 10. 



This is a very common species, and feeds on a great variety of 

 plants, either wild, or cultivated in gardens and in greenhouses ; 

 among these are Pelargonium, the cultivated species, Malva syl- 

 vestris, Primula veris and some cultivated species of that genus, 

 Aquilegia vulgaris, Bellis perennis, Bumex obtusifolius, Saxifraga 

 siberica, Erodium Cicutarium, Geranium Robertianum, G. mollc, 

 G. pusillum, G. Phaum. 



The viviparous wingless female. When young it is dull green; 

 the feelers, nectaries and legs are darker : the eyes are brown : 



