32 



Dorsal spines are found on the three segments, preceding the anal segment. 

 A chrysalis of the 14'** of April gave the butterfly on the 22"*^ of that 

 month ; with others this happened after 9 days. The figure of the caterpillar 

 has succeeded very well. 



6. Peribaea Godt. (PI. II, fig. 7 a, b). 



GoDART, Enc. Mdth. IXp. 154 N. 124 (1819 — 23). Pieris Peribaea. 



BoiSDUVAL, Spdc. Gen. I p. 453 (1836) ... „ „ 



SxELL. V. VoLL., Mou. d. Pier. p. 8 (i8b5) . . 



Rothschild, Iris V p. 441 //. ^ fig. 2 (1892) . „ „ var. Wallacei. 



W. J. During the many years I Uved there I never found this butterfly. 

 Not until later, in 1894, did I receive a specimen from the eastern part 

 of the province of Prajangan, where it is said to have since become very 

 common, especially near Bandoung. Dr. Martin f. i. found this species there 

 very frequently in January 1906. Proofs that it has been found in more 

 westerly districts of Java, were not known to me at that time. In January i go8, 

 I received, as already stated, a collection of about 5000 Rhopalocera, all caught 

 at Batavia and in its neighbourhood, and among these 34 specimens of this 

 species. And in the collection also referred to caught there in the dry season, 

 were many butterflies of this species too. Therefore I suppose that only 

 during the latter years has this species begun to spread from the eastern to the 

 western part of the island. Snellen van Vollenhoven also knows it only 

 from Sourabaya. Between the specimens caught in the wet and in the dry 

 season no difference is observable. 



C. J. Semarang (4), Jogjokarta (113), Bojonegoro (258) and in the pro- 

 vince of Tegal. 



E. J. Common in the low country at Sourabaya, at Kediri (64) and in 

 Madura. Found also at Malang (445). 



The species shows the same colour-dimorphism in both sexes as the pre- 

 ceeding one. On the under-side of the hind-wings the black has disappeared 

 still more than in the latter one. Both species are closely related, but in 

 each of them the said evolution has followed another course. In the Leyden 

 museum I also found a specimen from Allor, in which only the red on the 

 under-side of the hind-wings had extended a little more than in the specimens 

 from Java. The form from Soumba, described by Rothschild as Fasciata, 

 differs more from it, especially on the under-side ; this also is only a matter 

 of a different stage in the said evolutionary process. In a 9 from Bali in the 



