200 FOREST ENTOMOLOGY. 



discovery of a I\[e(iadigrim^ species as a conifer - seed enemy, as 

 Borries had pointed out to Judeich l)y letter in 1887 an insect 

 of the genus Torijmus — viz., massive females, but no males, of 

 Megastigmus stroM/ohius, liatz. 



Ilefercnres to lAtcrafure ronmlfcd. 



Cameron, P. A. Monograph of llie liritinh PliylophagouM Hyiiiciioptera. 3 

 vols. Ray Society. 



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

 Society. 1892. 



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



Judeich und Nitsche. Lehrbuch dcr Mitteleuropiiischen Forstinsektenkunde. 

 Berlin. 1895. 



MacDougall, l)r li. Stewart. Mc<jiiMi<jiimK upermotropkux, 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, (J. L. llevision of the Ncmatin.'c of North America. Washington. 

 1896. 



Morice, Rev. F. I). " Help-Notes towards the Determination of I'.ritish 

 Tenthredinidac " — Entomologist's Monthly Magazine for Jan. 1903. 



Niisslin, Dr Otto. Leitfaden der Forstinsektenkunde. Berlin. 190.5. 



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. 



