1916] 



Davis — A Nematode Parasite of Root Aphids 



39 



I was unable to find any adults where I had secured the pupse, 

 though conditions seemed favorable for their presence. The life 

 of the imago must be rather long, however, as it appears to have 

 a somewhat protracted season. So, too, the larval period seems 

 to be rather extended. 



It is to be hoped that inasmuch as this curious winter insect is 

 largely confined to the base of trees and is at times not uncommon, 

 the complete life-history may soon be worked out. 



A NEMATODE PARASITE OF ROOT APHIDS.i 

 By John J. Davis, 



United States Bureau of Entomology, West Lafayette, Ind. 



Parasites of root-infesting plant lice are so rarely encountered 

 that this record of a nematode attacking a root aphid is especially 

 interesting. We first found apterous viviparous and oviparous 

 individuals of a new species of Anoecia infested with nematodes at 





Fig. 1. Anoecia sp. infested with a Nematode. 



Lafayette, Ind., October 16, 1911, and again on October 19, and, 

 although a number of collections were made at frequent dates 



1 Published with the permission of the Chief of the United States Bureau of Entomology. 



