200 FOREST ENTOMOLOGY. 



discovery of a Megastigmus species as a conifer - seed enemy, as 

 Borries had pointed out to Judeich by letter in 1887 an insect 

 of the genus Torymus viz., massive females, but no males, of 

 Megastigmus strobilobius, Eatz. 



References to Literature consulted. 



Cameron, P. A. Monograph of the British Phytophagous Hymenoptera. 3 

 vols. Ray Society. 



Cameron, P. A. "The Galls of Mid-Cheshire" Manchester Microscopical 

 Society. 1892. 



Carpenter, George H. Insects : their Structure and Life. 1899. 



Judeich und Nitsche. Lehrbuch der Mitteleuropaischen Forstinsektenkunde. 

 Berlin. 1895. 



MacDougall, Dr R. Stewart. Megastigmus spermotrophus, Wachtl. 



MacGillivray, Prof. Alexander Dyer. A Study of the Wings of the Tenthred- 

 inoidea, a Super-family of Hymenoptera. Washington. 1906. (This is a most 

 excellent work.) 



Marlatt, C. L. Revision of the Nematina? of North America. Washington. 

 1896. 



Morice, Rev. F. D. " Help-Notes towards the Determination of British 

 Tenthredinidse " Entomologist's Monthly Magazine for Jan. 1903. 



Nusslin, Dr Otto. Leitfaden der Forstinsektenkunde. Berlin. 1905. 



Ormerod, Miss. Manual of Injurious Insects. 2nd edition. 1890. 



Trail, Prof. James W. W. The Gall-making Hymenoptera of Scotland 

 (exclusive of those that live on Oaks). 1888. 



