24 Buploeines forming Mimetic Groups 



more like pe lor, but the two discal spots on the fore wing are not quite 

 so far from the margin, though they are more proximal. 



E. Sylvester Sylvester Fabr., occurs from Thursday Island to Towns- 

 ville and Mackay. 



Both corinna and Sylvester are variable in the north, and are nearly 

 constant in the southern part of their range. 



Typical Sylvester is mimicked by eichorni, which occurs in the same 

 area, and is rarer than either corinna or Sylvester. 



Typical corinna is mimicked by Sylvester pelor and Sylvester 

 dardanus. 



It looks as though the Sylvester f. crithon acquired markings in 

 association with corinna, and that these markings were intensified by 

 association with eichorni. 



E.— FIJI ISLANDS. (Plate IIIb.) 



This combination is only represented by two species of Euploea — 

 helcita eschscholtzi F eld. (fig. 3), and proserpina Butl. (figs. 1, 2), and 

 is similar to but less white-marked than the Tenimber group. These 

 were first discussed by Mr. J. C. Moulton in the Trans. Ent. Soc. 1908, 

 p. 603, and figured on pi. 34. The discal spot on the fore wing of 

 proserpina was held to have been lengthened inwards so as to afford 

 a superficial resemblance to the chief spot of its model. The discussion 

 of these species was continued by Professor Poulton in the Proc. Ent. 

 Soc, 1919, pp. lxix-lxxi, and a third mimic introduced, Danais (Tirumala) 

 neptunia Feld. (pi. IVa, fig. 3). Professor Poulton showed that the 

 females were better mimics than the males, that the fore wing pattern 

 of the female proserpina was more highly dyslegnic, that of the male 

 less so, and that of the model still less so. He further suggested that 

 proserpina was a model for the other Euploea as regards its hind wing 

 pattern. 



At a meeting of the Entomological Society on November 17, 1920, 

 Professor Poulton exhibited further instances of the mimetic association 

 between two Euploeines and one Danaine in Fiji (Proc. Ent. Soc, 

 1920, pp. lxxx-lxxxiii). He showed that the female Danaine resembled 

 the Euploeas more closely than the male. It was also recorded that 

 the two Euploeas fly together in different parts of Viti-Levu and on 

 adjacent islands, and that they are often accompanied by the Tirumala. 

 There was also evidence that the model " eleutho " was at certain 

 times and places more abundant than its mimic proserpina. 



