15 



districts, and which, according to Dr. Hagen, occurs there in the higher as well 

 as in the lower regions. The phenomenon of colour-dimorphism shows off 

 very strongly in this species, Moore mentions the same of Catophaga Neombo 

 Bsd. of Ceylon, which is found there also in the mountains. It is a phenomenon 

 of evolution in which the irregular progress of the process of paling, which in 

 this case chiefly differs locally, is distinctly perceptible. In Malacca it seems 

 to be most advanced already; according to Distant both sexes living there are 

 white, forming thus the variety Nathalia Felder; of this species from the 

 Philippines and from Sumatra on the contrary only the cT are white already, 

 but the 9 are yellow, at least as far as I know ; from Nias, however, a yellow 

 cf has been figured {Tijdschrijt voor Entotnologie XXXVIII), and another one 

 from Engano is in the museum at Leyden. In the form from the Nicobars 

 (Chrysaea Fruhst.), figured by Bingham {Vol. II pL XVII fig. 114, 11 5) the 

 cf is dark yellow, which colour even passes into orange on the upper-side of the 

 hind-wings, and the ? dark yellow also, with broad black margins. 



In Java distinctly perceptible transition forms are found ; there yellow c? as 

 well as white ones are found, of which the latter are still always yellowish, viz. 

 have always still a few yellow scales. Among the 9 there are some whose 

 upper-side is entirely yellow or whose upper-side of the fore-wings only is white, 

 while that of the hind-wings is still yellow. Moreover the yellow of the c? from 

 Nias is considerably darker, approaching still more the orange colour than that 

 of the c? from Java, whereas that of the specimen from Engano is an inter- 

 mediate shade between these two. Only the theory of the colour-evolution 

 gives an explanation of these different things, which is not contradictory to 

 anything, and is therefore acceptable ; the more so as it is founded on the 

 principle of evolution. 



W. J. Once I caught this species in the Botanic Gardens at Buitenzorg (265), 

 but it is common in the Megamendoung- and Gedeh mountains (1400); I 

 received it also from the districts on the south-coast in the vicinity of the 

 Tjiletou or Sandbay. 



C. J. In the province of Japara. 



E. J. At Malang (44 5), from the Semarou mountains (800) and at Pouspa (630) 

 in the Tengger mountains. Also from Banjouwangi. 



The metamorphosis is still unknown. 



9. Lyncida Cram. (PI. I, fig. 6, a, b, c, d, e). 



Cramer, ///. 52 //. 131 ^ (1779) Pap. Lyncida. 



BoiSDUVAL, Spec. Gai. //>. 482 (1836) Pieris „ 



