( xxxi ) 



seemed therefofe possible that the mimicry by E. leda $ was 

 B itesian, the female finding perhaps a more effective defence 

 in the cryptic colouring of its under surface. In the remaining 

 cases there was less reason to presume edibility, and the females 

 had become powerfully aifected by other protected forms of 

 various affinities. 



With respect to some of the " models," the evidence of the 

 distasteful quality of the groups represented by Tiravuda 

 Irmniace and the two species of Mylothris was generally 

 admitted to be strong. There appeared to be no direct 

 evidence as to Xycldtona medusa, but it had the habits of a 

 protected form ; while Huphina iihrijne (nerissa) Avas found 

 by Ml'. Finn, as a result of many experiments, to be disliked 

 by several insectivorous birds. 



The species shown were as follows, a specimen of the 

 "model" being in each case placed beside the form which 

 resembled it : — 



Nepheronia hippia, Falir., associated with Tirumala limniace, Cram. 



N. avatar, Moore, „ Huphina, nerissa, Fabr. 



Leuceroiiia thalassina, Boisd., „ Mylothris spjica, Moscli. ^ . 



($ with brown upper wings.) 



L. argia, Fabr., „ 31. riippeUii, Koch (^ . 



L. pharis, Boisd., „ Nychitona medusa, Cram. 



Eronia leda, Boisd., ,, Teracolus incret^is, Bull. 



Mr. R. Adkin showed two specimens of Emmelesia uni- 

 fasciata which had emerged in August last from pupse which 

 had lain over since the autumn of 1900, thiis having passed 

 five seasons in the pupal stage. Some fifty larv« went to 

 earth in the autumn of 1900, from which ten moths emerged 

 in 1901, eleven in 1902, two in 1903, five in 1904, and the 

 two examples exhibited in 1905. 



Commenting on Mr. Adkin's remarks, Mr. A. H. Jones 

 mentioned that he had observed in this species a three years' 

 retardation. 



Paper. 



Dr. T. A. Chapman, M.D., exhibited a number of specimens 

 from the Riviera, Sicily, etc., and read a paper on the " Progres- 

 sive Melanism in the Riviera of llastida hyerana." 



