Mr. F. Walker's Descriptions of Aphides. 47 



81 ; Harris, Ins. New Engl. 190; Curtis, Journ. R. Agric. Soc. 

 hi. 54. t. C. f. 5, 6. 



A. Raphani, Schrank, Faun. Boic. ii. 1. 119. 1229. 



A. Isatidis, Fonscol. Ann. Soc. Ent. x. 



A. Floris-Rapa, Curtis, Journ. R. Agric. Soc. iii. 55. t. C. 

 f. 7, 8. 



Cinara Raphani, Sir Oswald Mosley, Gard. Chron. i. 827. 



C. Brassica, Sir Oswald Mosley, G. C. i. 827. 



Crambaphis, Amyot, Ann. Soc. Ent. 2 me serie, v. 478. 



This Aphis abounds on the cabbage, Brassica oleracea, from 

 the beginning of June to the beginning of November, and is 

 found both in Europe and in North America. The matriarchs 

 of the species dwell on wild plants, and their winged offspring 

 fly to the cabbage, repose there on the underside of the leaf, and 

 are soon surrounded by groups of wingless little ones. 



The viviparous wingless female. This when very young is linear, 

 pale green, and slightly powdered with white; the limbs are white : 

 in the middle of June when full-grown it is pale yellowish green, 

 slightly oval, very plump and convex, and most thickly covered 

 with white powder : the front is convex : the feelers are pale yel- 

 low with brown tips and much shorter than the body ; the first 

 and the second joints are not angular ; the fourth is less than 

 half the length of the third ; the fifth is a little shorter than the 

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

 longer than the fourth : the eyes are black : the mouth is pale 

 yellow with a brown tip : the nectaries are yellow, and hardly 

 more than one-twentieth of the length of the body : the legs are 

 pale yellow ; the knees, the feet, and the tips of the shanks are 

 black. It is extremely numerous and most abundantly powdered 

 in the beginning of July : the limbs are almost black, and the 

 nectaries are about one-twelfth of the length of the body: its 

 colour when it sheds its skin is soft fresh velvet-like green, but 

 it soon again assumes the dull dusty hue which harmonizes so 

 well with the underside of the cabbage-leaf. The part which it 

 infests becomes discoloured ; it often emits a colourless honey- 

 dew, is the prey of Aphidius (Trionyx) Rapa>, Curtis, and of an 

 Allotria, and is much infested by Leptus Aphidum. 



1st var. The body is dull olive-green, oval, short, and plump : 

 the feelers are white with black tips, and nearly half the length 

 of the body : the mouth is white ; its tip and the eyes are black : 

 the nectaries are black, and as long as one-twelfth of the body : 

 the legs are white and moderately long; the feet and the tips of 

 the shanks are black. In summer on Spinacia oleracea. 



2nd var. The body is green, yellow towards the head, and 

 covered with a whitish bloom : the feelers are yellow with black 

 tips, and more than half the length of the body : the legs are 

 yellow; the feet are black; the hind-shanks are green. 



