MAINE APHIDS OF THE ROSE FAMILY. 265 



Hyalopterus arundinis (Pruni) Fab. Mealy Aphid of Plum 



and Arundo. 



(Figure 89, K. Figure 95, E.) 



A 'heavy infestation of this species occurred on a variety 

 of large green plum at Orono in 1910 and again in 1912. Late 

 in July the leaves on the ventral surface were so thickly 

 packed that many of the aphids could find resting place only 

 for their beaks, their bodies being pressed out from the leaf and 

 supported by one another. There was no tendency to curl, the 

 foliage remaining even flatter than a normal leaf. The notes 

 taken at the time of this collection (79-10) July 27 are as fol- 

 lows : 



Alate viviparous female. Migrant. Head dark green, pul- 

 verulent; antenna dark, III with 30 more or less sensoria, IV 

 with row of about 8 sensoria; eyes reddish black; beak pale 

 proximally, dark distally, short and thick not reaching second 

 coxa; prothorax green, pulverulent; thorax green with lobes 

 dusky, venter dusky black, dorsum and yenter pulverulent; 

 veins slender, hind wing rather small and weak; femora and 

 tibiae green, tarsi black; abdomen slender, tapering, light green 

 with dark green median streak including cauda and with i 

 longitudinal dark green streak on each side, pulverulent; corni- 

 cles black, shorter than cauda, constricted at base. 



The pupal nymph in last instar previous to winging is colored 

 about as the apterous viviparous, wing pads slightly dusky at 

 margins. 



Apterous inviparonis female. Head pale green ; antenna 

 pellucid with tip dusky, pulverulent ; prothorax and thorax light 

 green, pulverulent; femora and tibiae pellucid and pulverulent, 

 tarsi dusky; abdomen slender, tapering, pulverulent, light green 

 with 3 dark green longitudinal markings the mid dorsal one 

 extending so as to include cauda ; cornicles dark. Packed un- 

 believably close on ventral leaf which remains uncurled. Maine 

 collection numbers 79-10; 75-12; 108-12. As the name indi- 

 cates this species migrates to certain grasses for the summer 

 generations. 



