26o MAINi: AGRICULTURAL EXPERIMENT STATION. I9I4. 



I have taken this species but once (99-06) at Orono, August 

 6, 1906, from the ventral surface of leaf, causing curl. 



Myzus persicae Sulzer. 



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

 Fall migrants of this general feeder were taken abundantly 

 on choke cherry, Sept. 27, 1910 at Monmouth (142-10) and 

 Sept. 24, 1912 at Orono (166-12.) 



Aphis cerasiEoeiae Fitch. Choke Cherry Aphid. 



(Figure 89, G-J. Figure 95, G. Figure 97, C.) 



This well defined species is common upon both tbe native 

 choke cherry, Prunus virgmiana and the western P. demissa 

 Walp. introduced in a nursery row on our camipus. 



Apterous female. Head, pale green or water whitish, beak 

 short, extending to 2nd coxa, eyes, antenna with I, II and III 

 concolorous with head, distal half darker to black, III with 

 no sensoria, proportions as shown in the figure; prothorax pale 

 green, lateral tubercles present; thorax green with dark green 

 mid dorsal line, femora and tibiae pale and tarsi black; abdo- 

 men pulverulent, pale green with dark green medial line and 

 dark green transverse lines between segments, lateral tubercles 

 present, cornicles pale with dusky tip slender, slightly taper- 

 ing and approximately twice the tarsus in length, cauda white 

 with dark tip, conical, being broad at base and abruptly taper- 

 ing. 



The nymphs and pupae are also pulverulent and have the 

 dark green mid dorsal and transverse intersegmental lines, 

 though these are not always well defined in the pupa which 

 has two lateral dark green stripes on thorax. 



Alate female. Head black, beak short, not reaching second 

 coxa, eyes black, antenna dark. III with from about 12 to 18 

 large sensoria about the size of the terminal one on V, IV with 

 from none to several sensoria like those of III, proportion of 

 joints as shown in the figure; prothorax green with black 

 transverse band, lateral tubercle present; thorax black, wings 

 iridescent with slender brown veins and large dusky stigma 

 with pointed tip; M commonly though not always with sec- 

 ond branch very short, abdomen glabrous, rather brig'ht though 



