Mr. F. Walker^s Descriptions of Aphides. 49 



each side at the base of the feelers, but having no tubercles : there 

 is a very little bristle on each side of the front : the feelers are 

 shorter than the body ; the fourth joint is hardly shorter than the 

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

 less than half the length of the fifth ; the seventh is full thrice 

 the length of the sixth : the back is adorned with six or eight 

 irregular lines of black dots : the tip of the abdomen is com- 

 pressed, but very short : the fore-legs are not much shorter than 

 the hind-legs ; the shanks are very slightly curved. 



60. Aphis Lactuca. 



Aphis LaciuciP, Linn. Syst. Nat. ii. 335. 14; Fabr. Ent. Syst. 

 iv. 220. 52 ; Syst. Rhyn. 301. 52 ; Reaum. Ins. iii. t. 22. f. 3-5 ; 

 Gmel. ed. Syst. Nat. i. 2205 ; Rossi, Faun. Etrusc. 264. 1401 ; 

 Schrank, Faun. Boic. ii. 1. 120; Fonscol. Ann. Soc. Ent. x. 170. 

 10; Kalt. Mon. Pflan. i. 37. 25. 



A. Ribis nigri, Sir Oswald Mosley, Gard. Chron. i. 684. 



This species feeds on the ^ following plants : Sonchus olera- 

 ceuSy S. asper, S. arvensis, Lactuca oleracea, Crepis tectorurrij 

 Picris echioides, Ribes nigrum^ R. rubrum, R. grossularia, R. uva 

 crispa. Like A. Berberidis it diff'ers from the other species of 

 Aphis in having spindle-shaped nectaries. 



The viviparous wingless female. This is hatched from the e^^ 

 in March on R. nigrum, R. grossularia, and more rarely on R. 

 rubrum. At this time and when very young it is light lively 

 green, shining, half- transparent, rather long, slightly convex, 

 and has three rows of minute tubercles along the back : the head 

 is almost white : the feelers are white at the base, brown tow^ards 

 the tips, and rather more than half the length of the body : the 

 eyes are dark red : the mouth and the nectaries are white with 

 brown tips, and the latter are about one-seventh of the length of 

 the body : the legs are almost white ; the shanks are bristly ; 

 their tips and the feet are pale brow^n. 



1st var. Dull dark green wdth still darker limbs : the feelers 

 are a little shorter than the body, and the nectaries are about 

 one-eighth of its length. 



When full-grown it is deep grass-green, oval, and shining : 

 the discs of the head, the chest, the breast and the abdomen are 

 black, and there is a row of black spots along each side of the 

 latter : the feelers are black, and as long as the body : the nec- 

 taries are black, spindle-shaped, and nearly one-fifth of the 

 length of the body : the legs are black, long, and rather stout. 



1st var. Green, dark green beneath, shaded with black or 

 sometimes all black above : the feelers are a little longer than 

 the body : the mouth is green with a black tip : the nectaries 



Ann. ^ Mag. N. Hist. Ser. 2. Vol. iii. 4 



