Maine; aphids of the rose family. 263 



The apterous viviparous parent of the foregoing form ib, 

 a nearly uniform dark brovirn with tibiae lighter than rest of 

 the body. 



This species has apparently not been recorded previously 

 from America. I had it described as new in manuscript but 

 it so closely resembles Aphis prunorum Dobrowljansky that I 

 hesitated to publish it under another name. It does not seem 

 to fall conveniently into either Aphis, Mysus, Rhopalosiphum 

 or Siphocoryne as ordinarily interpreted. It is, however, 

 closely allied to Siphocorym: (?) (Rhopalosiphum) nymphae, 

 and on the basis of alcoholic material alone I should not be 

 certain that it may not fall as a synonym of that species. This 

 is offered merely as a suggestion for future migration tests. 



Maine collection numbers 41-06; 11-09; 20-09 in pa-^t; 

 21-09; 31-09; 36-12; 47-12; 62-12; 169-12 in part. 



Aphis cardui Linn? (pruni Koch) (primifoliae Fitch). 



The Long-beaked Plum-Thistle Aphis. 



(Figure 92, L-M. Figure 95, F.) 

 The full cycle for this species has not yet been recorded for 

 America. I have no experimental evidence as -yet that the 

 plum-thistle cycle is established for this country. I had, how- 

 ever, noticed that structurally prunifoliae Fitch and cardui 

 were close and migration tests were planned to ascertain 

 whether they proved to be the same species, when Dobrowl- 

 jansky (1913) published the fact of the plum-thistle migration 

 for Europe and the synoiiomy of cardui and pruni Koch. 

 There seems so little doubt that the species here treated is the 

 same as the European that I am so listing it with the mere 

 precaution of a question mark biding the time of experimental 

 evidence. 



There is a very good color description of this species in the 

 third report of Thomas (1879) which accords exactly with 

 Maine material. Both the apterous and alate forms are hard, 

 shiny, and glistening in their black and green. 



Among the apterous forms are two color varieties, one con- 

 spicuously decorated with a big, shiny black patch on the abdo- 

 men which sometimes covers nearly the whole dorsum. Other 

 apterous individuals lack this as recorded by Thomas. These 



