306 



Insect Pests. 



Abroad it occin-s in all the nortliern European States, Germany, 

 France and Italy. 



TliFATMENT. 



Spraying with hellebore wash or arsenical wash when tlie larva; 

 are abundant is certainly advisable in nut plantations when the 

 young larva= are at first seen, as they cause great havoc, and the 

 parasites mentioned above do not do any good until all the damage 

 is done. 



References. 



(1) Theobald, F. V. Eeport on Economic Zoology for year ending April 1st, 



1906, p. 42 (1906). 



(2) Theobald, F. V. Keport on Economic Zoology for the year ending 



April 1st, 1907, p. 60 (1907). 



(3) Cameron, P. 'A Jlonograpli of British Phj-tophagons Hymenoptera,' 



vol. II., p. 35 (1885). 



THE NUT CATKIN MIDGE. 



{C'l-ciiJom 1/1(1 coryli Kalt.) 



The male catkins of the filbert, cob and hazel nuts are often 

 attacked by the small maggots of one of tlie gall-flies or Ceci- 



domyidff'. 



The mature insect I liave been unable 

 to breed so far, nor do I know of any 

 description of it. It is not recorded by 

 Verrall(l), yet it is widely distributed, 

 Ijeing very abundant in Kent, Sussex, 

 Middlesex, and I haA-e found it in Here- 

 tbrdshire and Devon. 



The damage done by it does not 

 appear to be generally very serious, but 

 Mr. Hammond of Canterbury wrote me 

 in 1899 that it was so abundant in that 

 part of Kent that it could be found on 

 every nut tree in large numbers. 



Weitenweber (2) and Kaltenbach (3) 

 refer to it in Germany. 



Ix'EFERENCES. 



(1) Verrall, G. H. 'List of British Diptera ' 

 (2n(l ed.), p. 7 (1901). 



(2) WeilertiKehei: ' Lotos,' p. 143 (1868). 



(3) KoMeiihacJi, ./, H. ' Ptlanzenfeinde,' p. 637 (1874). 



[ir. //. Uaiii, 



Fill. 205. — MALE CATKlNruK M.T 

 ATTACKED Bl' CEOIU rAll\'.E. 



