,326 Professor E. B. Poulton on 



Diptera. In this group very kind help has also been 

 received in special cases from Mr. G. H. Verrall, Mr. J. E. 

 Collin and Mr. E. E. Austen, In working out the 

 Neuroptera kind assistance was received from Mr. W. J. 

 Lucas, Mr. W. F. Kirby, Mr. Kenneth J. Morton and Mr. 

 C. A. Briggs ; the Orthoptera, by Senor Don Ignacio 

 Bolivar, Mr. W. F. Kirby and Mr. R. Shelford ; the 

 Lepidoptera, by Sir George F. Hampson, Dr. F. A. Dixey, 

 Mr. J. Hartley Durrant and Mr. R. South ; the European 

 and British Rhynchota, by Mr. Edward Saunders, F.R.S. ; 

 the Rhynchota from other parts of the world, by Mr. W. L. 

 Distant ; the Coleoptera, by Commander J. J. Walker, Mr. 

 Guy A. K. Marshall, Mr. G. J. Arrow, Mr. C. J. Gahan, Mr. 

 G. C. Cliampion, and Mr. W. Holland. 



The Hymenoptera have been especially difficult. Mr. 

 Edward Saunders, F.R.S., has determined the European and 

 British Aculeates; Colonel C. T. Bingham, the Oriental 

 and African Aculeates and Parasitica ; Mr. Claude Morley, 

 the European and British Parasitica ; Rev. F. D. Morice, 

 the European and British TenthrcdiniiLv ; Mr. A. J. Chitty 

 devoted much time to the difficult problem presented by a 

 minute Cynipid. 



A minute species of Collembola, which had puzzled 

 many naturalists, was finally traced to its true position by 

 Mr. Claude Morley. 



The British Spiders have been kindly studied by Mr. F. 

 P. Smith, but the results of his labours are almost confined 

 to the material for Part II. 



Special inquiries have been courteously answered by 

 Mr. C. 0. Waterhouse, Mr. G. T. Lyle, Mr. H. 0. Forbes 

 and Mr. W. R. Ogilvie-Grant, as well as by the naturalists 

 whose names have been already mentioned. 



Numerous errors are so difficult to avoid in a memoir of 

 this kind, dealing with such varied material and bristling 

 with data, that exceptional time and trouble have been 

 devoted to the correction of proofs. Not only have they 

 been read several times by the writer, but the following 

 friends have also most kindly been through them and 

 made many corrections and valuable suggestions: — Mr. 

 Edward Saunders, F.R.S., Colonel J. W. Yerbury, Mr. G. 

 H. Verrall, Mr. J. E. Collin, Mr. Claude Morley, Mr. G. A. 

 K. Marshall, and Commander J. J. Walker. Mr. W. J. 

 Lucas read through the proofs of the Neuroptera. Mr. 

 Marshall also rendered the kindest assistance in bringing 

 together upon a single copy the corrections on six sets of 



