( 19 ) 



and strongly mimetic. It is well seen in Heliconius hortense, 

 Guer., here exhibited, but is absent from the cryptic under 

 surface of Colaenis telesiphe." 



Wednesday, December 2nd, 1908. 



xcvi] 



Habits of Limenitis. — Professor E. B. Poulton, F.R.S., 

 read a note on the drinking habits of Limenitis syhilla, com- 

 municated by Mr. Keynes of Pembroke College, Cambridge. 

 A discussion followed in which Mr. H. Rowland-Brown, the 

 Rev. C Wheeler and other Fellows joined, suggesting from 

 observations made in the forest of Eclepens, Switzerland, 

 and elsewhere, that there is nothing unusual in the settling 

 habit of this species in warm moist woodland places to drink. 



Mimicry by Colaenis telesiphe and Belenois thysa, 

 PROBABLY Mullerian. — Dr. F. A. Dixey exhibited specimens 

 of Colaenis, Heliconius, Pereute, Mylothris and Belenois, and 

 remarked on them as follows : — - 



" It will probably be some time before a complete agree- 

 ment is reached as to the delimitation of frontier between 

 Batesian and Miillerian mimicry. One character that has 

 been suggested as a criterion is the possession of cryptic 

 colouring on the under surface. It has been argued, as by 

 Mr. Shelford, that no insect is likely to be both aposematically 

 and cryptically coloured at the same time ; and that therefore 

 any mimic, such as Protogonius, whose under side is adapted 

 for concealment, must be of the Batesian and not of the 

 Mullerian description. I have myself always been doubtful 

 as to the value of this criterion, and I have reason to know 

 that my doubts are shared by Prof. Poulton. 



" It will be remembered that at the last meeting I showed 

 that Colaenis telesiphe, Hew., though vmdoubtedly a mimic of 

 Heliconius telesiphe, Doubl., was cryptically coloured beneath. 

 But the available facts as to the relative frequency of the 

 two species, as stated by Prof. Poulton, make it difficult to 

 apply Batesian principles to the interpretation of the present 

 case. Since that meeting, Mr. W. F. H. Rosenberg has 

 kindly furnished me with some additional details as to the 

 xcvii] 

 occurrence of the two species, which tend to strengthen 



