262 MAINE AGRICULTURAL EXPERIMENT STATION. I914. 



PRUNUS. Plum. 



Aphis CERAsiFOEiAE Fitch. 



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

 On two occasions I have collected this species on Prunus 

 nigra Ait., where it colonies the ventral surface of terminal 

 leaves, curling them as it does those of the c'hoke cherry. 42-10. 



Aphis prunorum Dobrowljansky? Black and Brown Aphid 



of Plum. 



(Figure 89, C. Figure 95, D.) 



This species is common in Maine in June on the ventral 

 leaves and twigs of the cultivated plum, ordinarily not causing 

 a curl. Specimens of the alate viviparous female from culti- 

 vated plum collected at Canton, New York, June 11, 1909, 

 have been sent me. 



Alate viviparous female. The head, prothorax, thorax, and 

 cornicles are black; the abdomen is dark brown; the cauda is 

 dark; the wings are somewhat smoky with dark veins. The 

 beak extends to or beyond the second coxa. The lateral tu- 

 bercles of the prothorax and abdomen are prominent and 

 about ten times as long as broad. Antennal III with about 20 

 or fewer irregularly placed sensoria scattered the whole length 

 of joint; IV frequently with no sensoria, but also frequently 

 with one or two on the distal 'half ; V with no sensoria except 

 the terminal one ; spur of VI not much longer than III ; IV 

 and V about equal in length. The fore wings are characterized 

 by a long stigma with pointed tip with Rs joining it somewhere 

 near the middle of the margin, the second branch of M usu- 

 ally, though not always, near the margin of the wing; the hind 

 wing is large, full curved and with the veins nearly as heavy 

 as those of the fore wings. The cornicle is slender, about 

 twice the length of the cauda, constricted slightly near the 

 middle and again just before the tip. The pupal nymph which 

 develops into this form is dull greenish brown with greenish 

 pads. Head and entire body pulverulent both dorsally and 

 ventrally, the powdery dots on the abdomen being arranged 

 in lateral lines and also transversely at the two extremes of 

 the abdomen. 



