ART. 20 



THE APHID GENUS AMPHOROPHORA MASON 



57 



Alate male. — Antennae much longer than body, dark colored 

 especially III, hairs nearly as long as width of segment, III and V 

 with sensoria, IV without. Beak about reaching second coxae. 

 Cornicles dark colored, long, moderately swollen, tips imbricated. 

 Cauda as seen from the side, is of moderate length, not constricted 

 and with 3 or 4 lateral hairs. Measurements as follows: 



Apterous Oviparous Female. — This is described by Van der Goot. 



Biology. — This species is found on probably a large number of the 

 members of the genus Ruhus, both wild and cultivated. Exact 

 specific records of the host plants are, however, often wanting. So 

 far as known it has no alternate host, and it has been found throughout 

 the summer on Ruhus. 



Pergande found them singly on the under side of leaves. He called 

 attention in his notes to the difference between this and the habits of 

 sensoriata Mason, which are found on the canes. 



In his account of fragariellum, Theobald gives additional biological 

 data. 



It is probable that this species is responsible for the spread of 

 mosaic, but there are no definite published data as yet. 



Tlieobald reports it from the dissected crops of young fowls. 



Food Plants. — Ruhus, strawberries. 



Distrihution. — Europe, North America (Massachusetts; Maine; 

 Ottawa, Canada; New York; District of Columbia; Virginia; Ohio; 

 Minnesota; Colorado; New Mexico; and California). 



Type. — Kaltenbach's type is undoubtedly lost. Specimens which 

 I consider to be this species and which agree with descriptions of other 

 authors are in the National Collection. 



