PBEFACE. 



IN this volume I have described the remaining three 

 families of the Tenthredinidse, the Cephidae, Siricidae, 

 Oryssidse, and the parasitic Cynipidse. The fourth 

 (and concluding) volume will deal with the inquiline 

 and gall-making Cynipidaa, and will also contain such 

 additions and corrections as increased knowledge may 

 have brought to light during the period the book has 

 been in course of publication. 



It only remains for me to thank my correspondents 

 for their continued kindness in assisting me with my 

 work. 



SALE, CHESHIRE; 

 April, 1890. 



