New York Agricultural Experiment Station. 485 



from H. pruni, being smaller and more active. Other structural 

 differences are very slight, if any. The markings on the thorax 

 are slightly different. This species was found closely associated 

 with H. pi'um. 



Aphis pruni* Fab. A common species on the plum. Numerous 

 early in the season. Winged females (migratory brood) with 

 young scattered through the Station orchard during the latter 

 part of September and early in October. 



Phorodon hwinuli. During August, September and October oc- 

 casional individuals were found in the plum orchard. August 26 

 a few apterous and winged females with larva? were found on 



the plum leaves. 



Attacking the Currant. 



Myzus rihis Linn. 



This species is especially injurious to the red currant. The 

 lice cause red bladder-like galls to form on the leaves. A badly 

 infested leaf becomes greatly distorted and curled as the result 

 of these gall formations, as shown in Plate XXVIII, fig. 5. The 

 degree to which the leaves are distorted by the lice seems to be 

 influenced by the variety of currants. In the Station garden the 

 leaves of Fay and Cherry currants were distorted by the lice 

 much more than those of the London Red, although all three 

 were infested equally and by the above species. 



The injury caused by the lice was very apparent in the Station 

 garden. The leaves dropped from the bushes and the fruit was 

 injured both by premature ripening and by the black fungus 

 which grows in the honey dew secreted by the IJce. 



History and present distribution. — This species is probably of 

 European origin. It is widely distributed throughout the eastern 

 part of the United States, occurring from Maine to Illinois and 

 probably further west. It is also well known in Canada. 



Food plants. — Besides the red currant, it infests the black cur- 

 rant and gooseberry. 



Descriptions and notes on life history. — The winter eggs hatch 

 soon after the leaves open. Last year by May 13 the lice had be- 



• Identified by Mr. Th. Pergande. 



