190 MAINE AGRICULTURAL EXPERIMENT STATION. I912. 



Rhopalosiphum nyinphacac (L.) Koch (A. bntomi Schrank) (R. 



najadum Koch). Passerini, 1863, p. 2U 

 T. shuttleworthii Koch. 



Mysus persicac Pass. Passerini Flora. 



SPARGANIACEAE. BUR-REED FAMILY. 



SPARGANIUM. Bur-reed. 

 S. ramosum Curt. 

 Rhopalosipliiiin nymphacac (L.) Koch. (A. butonii Schrank) (R. 



najadum Koch). Passerini, 1863, p. 21., 



NAJADACEAE. PONDWEED FAMILY. 



NAJAS. Naiad. 



N. fiexilis (VVilld) Rostk. & Schmidt. (Naias flexilis). 

 Rhopalosiphum nyjiiphacac (Linn.). Williams, 1891, p. 18. 



POTAMOGETON. Pondweed. 



P. natans. 



Rhopalosiphum nymphacae (Linn.) Koch. Buckton, 2, p. 13. 

 P. sp. 



Rhopalosiphum najadum Koch. Koch, p. 45. 



ALISMACEAE. WATER-PLANTAIN FAMILY. 



ALISMA. Water Plantain. 



A. plantago-aquatica L. 



Aphis abbreviata Patch. Patch, 1912c. 



Rhopalosiphum nympheae (Linn.). Buckton, 2, p. 13. Patch, 1912c. 

 Rhopalosiphum nymphaeae (L.) Koch. (A. butomi Schrank) (R. 



najadum Koch). Passerini, 1863, p. 21. 

 Rhopalosiphum nymphacae L. (Rh. alismae Koch in litt.). Koch, p. 26. 



BUTOMUS. 



B. umbellatus. L. 



Rhopalosiphum nymphacac (Linn.) Koch. Buckton, 2, p. 13. 

 B. sp. 



Rhopalosiphum biitomi Schrank. Lichtenstein, La Flore. 



SAGITTARIA. Arrow-head. 



S. latifolia Willd (variabilis Eng.) 

 Rhopalosiphum nymphacac Linn. (Aphis aquaticus Jackson). Davis,. 



1910a, p. 245. 



