103 



Wings: average length, 3.5 mm.; width, 1.36 mm. 



"Monell, wild plum. June 8". Myzus persicce Sulz. 



Vials 



"ii, Pink. Plant and Bark-lice. Cobden, Illinois, March 15, 1877." 

 The plant-lice are Myzus persicce. 



"27" and "136". Callipteriis helhis Walsh. 



"Mymis cerasi". Dried up and indeterminable. 



"36". Colopha iibnicola and its galls. 



"80" and "No. 12 Poplar, Sauk City, Wis." Pemphigus populicau- 

 lis Fitch. 



"81" and ''No. 4 On Plum. Sauk City, Wis." Dry specimens in 

 vial. This is the species, characterized by Thomas as Aphis 

 pnini Koch. Although in poor condition they are recognized 

 as A. prunifolicc Fitch. 



