MAINE APHIDS OF THE ROSE FAMILY. 267 



summer, so that it is ordinarily found on the apple only in the 

 spring and fall and in the egg stage, during the winter. It is 

 characterized by the short distal branch of wing vein M, the 

 peculiar distal constriction and flange of the cornicle, and the 

 antenna, details whidh are shown in the figures. 



Aphis pomi. The Green Apple Aphis. 



This species is by far the most troublesome of the leaf 

 aphids of the apple in Maine, It is not migratory and is, there- 

 fore, to be found at all seasons of the year upon the apple in 

 some form or other. Like avenae and sorbi this aphis passes 

 the winter in the egg stage on the apple tree. At other times 

 it is to be found on the new growth shoots and leaves or even 

 on the fruit -itself. 



Aphis sorbi. Rosy Aphis of the Apple. 



(Figure 90, E. Figure 96, B.) 

 There is no difficulty in recognizing this species as the dorsal 

 tubercles of the head, prothorax and caudal segments of the 

 abdomen, as well as the antennal characters serve to distin- 

 guish it. Professor Sanderson (1901-02) gives a very care- 

 ful account of this species with good color notes for the differ- 

 ent forms. Maine collection numbers 32-09; 39-09. 



Myzus pERSICAe Sulzer. 



(Figure 90, F. Figure 96, G.) 

 The only collection of this general feeder that I have made 

 from apple was in 191 1 where winged forms that had devel- 

 oped on chrysanthemums in the greenhouse colonized with 

 their progeny on apple seedlings growing in the same house. 

 Maine collection number 91-11. 



PYRUS JAPONICA. 

 Aphis brevis Sanderson. The Long-beaked Clover Aphid. 



(Figure 94, D. Figure 95, K. Figure 97, B.) 

 Specimens of this species were taken on Japanese quince, 

 June 28, 1906, and again July 21, 1906. Maine collection 

 numbers 56-06, 80-06. A discussion of this species is given 

 under Crataegus. 



