June, '15] 



britton: a destructive European sawfly 



379 



During the fall of 1913, hippohces was traced from Persicaria to 

 Eloeagnus and Hippohces, where the oviparous females were deposited, 

 the winged males coming later. In the spring of 1914, branches of 

 Eloeagnus and Hippohces rhamnoides having eggs of Rhop. hippohces 

 and Myzus hraggii were taken to the insectary where they hatched 

 and the second brood developed wings in both species. Rhop. hippo- 

 hces was placed upon Persicaria where the alate specimens immediately 

 gave birth to j^oung which remained on the plant. These passed 

 through ten generations on this plant. Myzus hraggii was placed upon 

 the Canada thistle and was reared with equal success. 



The figures on Plates I, and II, will indicate how distinct these two 

 species are. 



Another species of Rhopalosiphum, closely allied to hippohces but 

 more robust, -with capitate hairs upon the dorsum of both the apterous 

 and alate forms and with filament of antenna much shorter than in 

 hippohces, has been taken repeatedly upon Elccagnus and Hippohces 

 but the summer host has not been found. It is very well represented 

 by Koch's Figure 37, except that the cornicles are clavate near the 

 end as in hippohces. 



A DESTRUCTIVE PINE SAWFLY INTRODUCED FROM 



EUROPE. 



Diprion (Lophyrus) simile Hartig 



By W. E. Britton, State Entomologist, 

 New Haven, Conn. 



On August 27, 1914, in company with my assistants, Messrs. I. W. 

 Da\is and M. P. Zappe, while inspecting a nursery in New Haven, a 

 few scattered sawfly larvae were noticed feeding upon the foliage of 

 pine trees six to eight feet tall. This work was continued for the next 

 few days and, in one part of the nursery, where several species of pines 

 were planted for exhibition and sale, the larvae were rather abundant, 

 and the men spent an hour or more gathering all that could be found 

 and the material was taken to the laboratory. 



Supposing it to be a native and not uncommon species, and knowing 

 that Dr. A. D. MacGillivray, who has prepared the portion concerning 

 sawflies for the forthcoming Hymenoptera of Connecticut, was study- 

 ing sawfly larvae, some of this material was sent to him and the remain- 

 der placed in breeding cages in our insectary. Dr. MacGillivray 

 did not recognize the species from the larvae but thought that he might 

 identify it if the adult stage could be obtained. On April 8, 1915, a 

 male emerged from a cocoon in one of the cages, followed by others, 

 and on April 15 a female appeared. Some of the males and females 



