AGRICULTURAL EXPERIMENT STATION. 109 



The above description refers to tlie bark-louse found so abun- 

 dantly upon the elms in Maine and referred to in the introduction 

 as The Elm Tree Bark-louse, which Mr. Cockerell describes as a 



7ietv variety. 



THE GOOSEBEERY PLAXT-LOUSE. 



Myzus ribis^ L 

 Order Hemiptera : Family Aphid^. 



We have received from Mr. Delano Moore and other parties dur- 

 ing the last three years, specimens of gooseberry twigs, in which 

 the leaves at the end of the branches had been killed, resulting in 

 the development of several short sub-terminal shoots, making a 

 terminal dense cluster of short branches and small leaves. Care- 

 ful examination of several specimens did not reveal any insect at 

 work, nor could we find any evidence that the main shoot had 

 been infested by either insect or fungous parasites. There were 

 present in several specimens the moult skins of a species of aphis 

 or plant-louse, which we presumed had to do with the injury. 



The species mentioned above is known to infest currant and 

 gooseberry bushes, causing the leaves to curl and blister, and 

 though we were not able to identify the species from the molt 

 skins, suspect it is responsible for the injuries. 



To secure the insects for examination it will be necessary to 

 search for them earlier in the season. The attention of those who 

 have been troubled by these terminal groivths on goosehevrj bushes, 

 is called to the matter. We would like to receive specimens earlier 

 in the season. When the terminal leaves begin to show injury. 



