distinct. The underside is sometimes yellowish, sometimes darker brown ; at 

 the base of the primaries there is always a somewhat more extended dark patch 

 which spreads a little way over the white {a). This spot occurs also in all 

 the male forms, and is a good characteristic for the species. The specimen 

 from the Tengger mts. is remarkably light on the underside, while both the 

 white, upon the upperside of the primaries and the white line on the secon- 

 daries, is very strongly developed. 



The second form Si consists of the males least far advanced in the process 

 of darkening. I possess lo specimens of these; 6 captured in Batavia, some 

 in the dry and some in the rainy season, and 4 specimens from the Semarou 

 mts. (700) and from Malang (443) in E. Java. The last are the least far 

 advanced ; in these the extension of the white on the upperside of the primaries 

 is difficult to distinguish from that in the female, described above as the first 

 form ; whereas in the specimens from Batavia Sc it is much more strongly 

 affected by the darkening process, causing it to tail off in two points, which in 

 the most advanced specimens narrow down to a white stripe at the lower end 

 of the patch, still united to the rest of the patch, however. 



The form 8d also consisting of males, is characterised by the same 

 marked decrease of the size of the white patch on the upperside of the primaries, 

 here so far advanced that it is divided into two patches, the lower of which 

 is seen as a separate white line below the other, which is more oval. I 

 have 30 specimens of this form, captured in Batavia, and 1 from Buitenzorg, 

 the former taken both in the middle of the dry season and of the rainy season, 

 without this apparently having the least influence upon their form. The under 

 side is sometimes paler or sometimes darker; the stripe on the upperside of 

 the secondaries always present in the first and second group, can often be 

 seen in this group also, but is frequently almost or entirely absent. 



In the form Se, represented by eleven specimens from Batavia, taken 

 both in the middle of the dry and of the rainy season, and one from Buiten- 

 zorg, the underside is again sometimes fainter and sometimes stronger in 

 colour, and only the characteristic white spot on the upperside of the prima- 

 ries remains, while the white stripe present there in the third group, has 

 disappeared. Sometimes (8/) even the oval white spot has diminished in not 

 much more than a relic, so that the white has almost entirely disappeared. 

 Upon the underside of the primaries, however, there always remains something 

 more of the white patch. 



