176 
BRlTtSH APHIDES. 
The sole difference was that the bodies were dullerj 
and the cornicles were paler. The pupa figured is from 
the black currant. 
This Aphis does much injury to the cherry orchards 
in early spring, when they cluster by thousands under 
the leaves and dry them up as if scorched by heat. 
Fitch in America counted 190 individuals ranged down 
the midrib of one leaf. They often choke and gum up 
the pores of the leaves by the secretion which they 
eject from their cornicles. On account of this sweet 
substance the affected branches are much visited by 
ants. 
Two swarms usually occur in the year with a certain 
interval, one in June and the other in October. During 
the latter period the male makes its appearance. Mr. 
Walker states that in Essex it was frequent in 
October, 1866. He describes them as wholly black, 
and probably the older specimens often are so 
coloured. 
Fitch describes an Aphis, common in America on 
the cherry, under the name Aphis cerasifolice. Pos- 
sibly it may prove to be a variety of the European 
species, but as he says the body is green, and gives 
some other small differences, it is not safe to include 
it amongst the synonyms of the insect here described. 
Myzijs CtEACilis, Buckton, Plate XXXIV, fig. 5. 
The apterous viviparous female is as yet unknown* 
Winged viviparous female. 
Inches. Millimetres* 
Expanse of wings 0‘280 7 "8*10. 
Size of body 0*100x0*040 2*54x1*01. 
fjength of antennee 0*090 2*27. 
cornicles 0*020 0*50. 
Pale green. Head and thorax together as long or 
longer than the abdomen. Head small and brown. 
