Insects Injurious to the Apple. 137 



yellowish-red to pink, wing buds paler with dusky apices, also 

 mealy. 



Winged rivijjarovs female with black thorax, yellowish-red abdo- 

 men; cornicles black; legs with pale bases and tibiic and also pale 

 around the bnse of the cornicles. The autumn form has deep black 

 head and thorax, reddish-brown abdomen with a dusky central area 

 and a dark band between the cornicles. Structurally this autumn 

 form differs from the spring in having no 

 tubercles on the head, and on the seventh 

 and eighth abdominal segments. 



The oviparous female is pale lemon- 

 yellow with dusky head, eyes, antenn;c 

 and tarsi. The male is winged, and has a 

 greenish abdomen marked with black and a 

 dark thorax and narrower than the winged 

 female. This species hatches about the 

 same time as A. Jitchii, that is, somewhat 

 earlier than A. pomi. Two or three broods t-f'- ^■ 



, , , ,11 ^1 ^ a ■ FIG. no.— Aphk sorbi. LARVA 



occur, and then they leave the apple, tiymg yi,,,y, viviparous female. 



apparently to a new food plant. They (Greatly eiiiaiged.) 



disappear during the last w^eek in June until the second week in 

 July. The autumn winged females return in September and October 

 and produce a generation of winged males and wingless oviparous 

 females. The latter lay their oval, shiny black eggs either on the 

 spurs, axils of buds, shoots, or on the trunks of the trees. Most, if not 

 all, the aphis eggs found on the trunks belong to this species. 



In Cambridge some years ago this was the only form I found, and 

 was considered to be the Ap)Ms mali, i.e., A. p)oini, De Geer. In 

 Kent it is common, and during 1906 did no little harm to the young 

 leaves. 



The Blossom and Stem Aphis. 



{Aphis fitchii. Sanderson.) 



This also has been taken to be the common Aphis pomi by 

 Ormerod(3), Whitehead (4), and others in Britain. Yet in 1829, 

 Joshua Major (5) clearly pointed out this species as different from the 

 Leaf Curling Aphis. The specific definition of this Blossom Aphis 

 was made by Mr. Dwight Sanderson (6) whose work made me 

 examine the Apple Aphides of this country more closely. 



This species I found in Kent in all the localities where it was 

 sought for, but did not seem to be more destructive than the two 



