10 



Mr. Roland Trimen, F.R.S., has frequently visited the De- 

 partment, and has rendered much kind assistance in the study 

 of African butterflies. 



During residence in Oxford in 1909 Mr. S. A. Neave not 

 only studied his own collection with a view to his memoir for 

 the Zoological Society, but also gave much valuable help to 

 the Department by classifying the Acracinae. In the course 

 of this work he made the remarkable discovery that a trans- 

 parent tropical East African butterfly, long known as Acraea 

 crystallina of H. Grose-Smith, is the female of A. chilo of 

 Godman (Ent. Monthly Mag., 1909, p. 171). 



A discovery of equal interest was made by Mr. Harry 

 Eltringham, who in the course of his researches upon mimicry 

 in African butterflies found that an Acraea hitherto known as 

 A. aurivillii, Staud., is the female of the eastern form of the 

 common A. alciope. Much kind help was afforded by Dr. K. 

 Jordan in the successful attempt to clear up the considerable 

 confusion in which this problem was involved (Proc. Ent. 

 Soc, Lond., T909, p. 13). 



Very kind help has been received as in previous years from 

 Mr. Hamilton Druce in determining species of Lycacnidae 

 and Hesperidae, and from members of the staff" of the British 

 Museum of Natural History in their respective groups* 



Mr. T. Bainbrigge Fletcher has examined and named the 

 Pterophorina ("Plume-moths") and described a new genus 

 and species (see p. 14). Mr. W, J. Kaye rendered kind 

 assistance with the South American butterflies, Mr. W. J. Lucas 

 with the British Neuroptera. Dr. Achille Griffini's kind help 

 is acknowledged in sections 8 and 14. 



13. Visits of Naturalists. 



It was impossible to arrange for the visit of the Council of 

 the Entomological Society at the usual time towards the 

 beginning of July. It is hoped, however, that there will be 

 a large gathering in the present year. 



The Department has in the course of 1909 been visited by 

 the following naturalists who have contributed to the collec- 

 tions at various times : — Dr. Malcolm Burr, D.Sc, M.A., F.E.S., 



