42 



than the original. When treating of the caterpillars of the Papilionidae I intend 

 to speak about an example of it. The matter still needs explanation. But 

 the above-mentioned fact also again clearl}' shows that these arrangements of 

 the pigment are led by an evolutional process and that therefore the colours 

 and patterns on the wings of the butterflies are governed by physiological 

 rules and are only exceptionally dependent on external influences. 



Between butterflies of this species from different islands there is a somewhat 

 greater difference than between those from Java only where also the cf of the 

 dry and of the wet season do not differ either; so the under-side of specimens 

 from Flores still shows distinctly the same reddish yellow which is peculiar 

 also to some $ of C. Pomona F. in Java. Evidently the colours and shades 

 of this species prove that it is subject to the same process of colour-evolution 

 as C. Pomona F., though perhaps in some races ephtasy is taking place. 



The caterpillar as whose food plant Horsfield and Moore mention Cassia 

 Fistula L. and C. Obtusifolia L. and Dr. Martin C. Sophera L. from 

 Sumatra, was found by me on jouar (C. Florida Vahl), kasingsat (C. Occi- 

 DENTALis L.), kefepeng (C. Alata L.) and once on jambou idjou (Jambosa spec). 

 It has the common Pieris form, dark-green, the head also, with a pale yellowish 

 line on the sides, which is sometimes partly, sometimes entirely bright yellow 

 or reddish. Parallel to this line above it there is a row of black dots, some- 

 times larger, sometimes smaller in number, and sometimes even in great 

 numbers along the whole length of the line. In this last case the foremost of 

 these dots are sometimes steel-blue with a metallic hue. The back looks like 

 shagreen, when magnified this is seen to be caused by small black spines, 

 which cover it entirely. The under-side is pale greenish yellow or bluish grey. 

 The thoracic legs of this caterpillar also have got thicker, but not so thick, 

 however, as those of I. Glaucippe L. The pupa also has the Pieris form, 

 without eminences, but strongly bent; its colour is pale green with a bright 

 yellow line along the sides. From a chrysalis, pupated on the 2^^, the imago 

 emerged on the 9'*^ of September. 



Horsfield and Moore gave as figure of the larva a bad one of I. Glau- 

 cippe L. Their figure of the pupa is better. 



3. Pomona F. (PI. Ill, fig. 6, a, b, c, d, e, /, g, h, i, k. 

 PI. IV, fig. I, a, b, c, d, e,/.) 



Fabr., Syst. Etit. p. 479 N. 158 (1775) Pap. Pomona. 



Cramer, I p. %t pi. ^^ C, D. {i^-jc,) , Crocale. 



