40 



flights as if migrating, which is confirmed by Neville Manders, especially about 

 the coast districts. {Trans. Ent. Soc. of London 1904). In Java this is not the 

 case, neither does Rainbow mention this about Australia, though he says that 

 there also the butterfly is a rather common species. They fly low near the 

 ground and like to sit down on wet sand. 



In this species the black on the upper-side of the fore-wings of the § is so 

 much more strongly developed than on those of the cT that the sexes can 

 easily be recognized by it ; it is, however, no secundary sexual characteristic, 

 but only a phenomenon of colour-evolution. 



In August I once found 4 caterpillars which — just as their pupae — resemble 

 so much those of C. Scylla L. that I took them for these, but which gave 

 both sexes of this species. Dr. Hagen also has observed this resemblance; 

 Dr. Martin on the contrary maintains that the head of the pupa is not 

 pointed as in C. Scylla L. and C. Pomona F., but blunt-rounded. These 

 caterpillars feed on ketepeng (Cassia Alata L.). The same food plant is 

 mentioned from Sumatra by Dr. Martin, as also from China. {Trans. Ent. 

 Soc. of Londo7i 1905). According to Bingham in British India the food plant 

 may be Cassia occidentalis L. 



2. Scylla L. (PI. Ill fig. 5 a, b). 



Linn, Mus. Lud. Ulr. p. 242 (1764) Pap. Scylla. 



Cramer, / /. 17 //. i 2 C Z?. (1779) „ „ . 



HoRSFiELD, Cat. Lep. E.I. C. p. 133//. 47?^. 6, 6a (1828) . Colias Scylla. 



BoisDUVAL, Spdc. Gen. I p. 631 (1836) Callidryas Scylla. 



Snell. V. VoLL., Mon. d. Pier. /. 62 (1865) „ „ . 



Distant, Rhop. Mai. p. 299, //. 20, fig. i, 2. (1882 — 86). Catopsilia Scylla. 



Staud, Exot. Schn. p. 39, //. 21 (1884 — 88) „ „ . 



Bingham, Fauna of Br. India /. 224 (1907) „ „ . 



W. J. Batavia (3 — 14), Buitenzorg (265), and in the Salak, Megamendoung, 

 Gedeh and Waiang mountains (1500). 



C. J. Near Magelang (+ 500) and in the province of Tegal. 



E. J. Banioupoutih in the district of Loumajang (45), Jember (98) and 

 Kediri (64). 



These localities where I caught this butterfly, are the only ones I have 

 made a note of; in reality it is common all over Java, as well in the low 

 country as in the mountains. During life its eyes are yellowish green. While 

 the process of the colour-evolution reveals itself in C. Pomona F. in a very 



