23 

 THE IMPORTED ELM BARK LOUSE. 



Gossyparia ulmi (Geoff.). 



This recently imported bark louse was first noticed in Massachu- 

 setts about eight years ago and is now very common in many parts 

 of the State on the various species of elms. It has been particularly 

 injurious to Camperdown elms here on the college grounds and is also 

 common on the native species. In the vicinity of Boston, especially 

 in the adjoining towns of Brookline and Brighton, numerous young 

 American elms have been observed in an almost lifeless condition 

 from its exhaustinsj; attacks. 



Fig. 13.— Imported Elm Bark Louse. 

 a. Adult female from below; h, adult female from side; c, adult female from 

 above, all greatly enlarged ; d, empty waxy cushion; e, females in natural condi- 

 tion, enlarged; /, shrivelled females, natural size. (From Insect Life.) 



In general appearance these bark lice somewhat resemble the com- 

 mon Mealy Bug of the greenhouses. The adult female (Fig. 13) 



