( Ixxxiv ) 



with the dark margin itself. This brings the hind-wing of 

 the model into close correspondence with that of the mimic, 

 a correspondence which does not exist in the case of the 

 usual form of the model. It is of course conceivable that 

 this special feature in the Hwpliina is merely accidental ; 

 but in view of the fact that a similar condition is usual in 

 Ixias, whereas in H. nerissa it is practically confined to 

 the particular form that is mimicked by Ixias, it seems more 

 explicable as a case of diaposematism — a principle which ex- 

 perience is continually showing to be very widely prevalent. 



" In this instance the JIuphina has on the whole acted as 

 the model, under whose influence the Jxias has drifted some 

 distance away from the usual aspect of its genus. But in the 

 particular case of the hind-wing the process is reversed ; the 

 Ixias has been the model, and has in its turn been mimicked 

 by the JIuphina. 



" We have some direct evidence that H. nerissa is disliked 

 by insectivorous birds. I am not aware of any such evidence 

 in the case of Ixias. But if the foregoing conclusions are 

 well founded, the association between the two must necessarily 

 be Miillerian and not Batesian." 



Mr. S. A. Nbave exhibited a number of Lepidoptera selected 

 from the collection made by him in N.-E. Rhodesia, in 1904 

 and 1905, comprising the following rare and remarkable 

 species : — 



Melanitis lihya, Distant ; Liptena homeyeri, Dewitz ; Pentila 

 pencetia, Hew. ; Catochrysops gigclntecl, Trim. ; Crenis jjeckneli, 

 Dewitz, and Crenis rosa, Hew., which are evidently two distinct 

 species ; and Crenidomimas concordid, Hopff ., the mimic of 

 the last two species. Also two remarkable species of the 

 genus ^j9/i?i«MS— including a female, so rarely taken in this 

 genus — Acrma natalica, Boisd., and Acrxa anemosa, Hew., with 

 two remarkable moths showing a close mimetic resemblance 

 to them. 



The exhibitor further stated that his collection would, he 

 thought, prove exceedingly interesting as regards seasonal 

 forms especially in the Acrseinse and Pierinaj, of which he 

 showed examples. 



(«) Ac7-iva acrita, Hew. — Diy, intermediate and wet phases 



