xvin 



Chrvseis Drury (Pvranthe L.) occur all the year round. And recently the 

 journey of Major Powell-Cotton in the large African tropical virgin forest of 

 Itur}' informed us that there the seasons are not sharpl)- separated; generally 

 it rains there four or five days a week; seven successive days without a 

 thunderstorm was the longest period observed by this traveller. But it seems 

 that not much attention is paid to these observations that are contrary to the 

 prevailing notions. Bingham, however, also remarks that the so-called wet 

 and dr)' seasonal varieties are often captured together. A short time ago 

 dr. Martin also showed me in his collection specimens of Thyca Rosenbergii 

 Voll. bred at Macassar in all the months of the year and in which no diffe- 

 rences are to be seen. 



Lastly I received by the kindness of Mr. Edward Jacobson at Batavia in 

 the year igo8, about 5000 Rhopalocera, all caught in the latter half of 

 December and the first half of January 1907, that is, in the wet season, among 

 which are many specimens of Pieridae common there. And later on, in 

 1909. I got another thousand caught in the same localities in the months 

 of August and September 1908, that is in the very heart of the dry season, 

 among which also several Pieridae, which furnished me an excellent material 

 for comparison. Among these last thousand were many specimens of Callidryas 

 PoMOMA F., two of Callidryas Scylla L. o'; the both sexes of Iphias Glau- 

 cippE L., the 9 of which quite fresh; 3 d and 3 9 of Thyca Belisama Cram.; 

 3 c7 of PiERis Java L. Sparrm. ; one pair of Thyca Egialea Cram., and 

 several of Thyca Hyparete L. and of Thyca Peribaea Godt., as well as of 

 Terias Hecabe L. and Terias Sari Horsf. Of all the above named species 

 there were also many specimens in the wet season collection. There were 

 further 7 specimens of Pieris Nerissa F., all of the form Corva Wall., but 

 the 5 (J absolutely identical to those from the wet season, the two 9 being 

 far more light coloured, showing as much white on the upper-side as the d", 

 though, as they were caught at the same time and in the same place as 

 the 5 o" this fact may not be an inducement to conclude thereby that any 

 difference of form should exist during the dry or the wet se^ison. Only 

 among the many specimens of Callidryas Pomona F. was a slight difference 

 to be stated, in as much as among the wet season individuals the 9 form, 

 indicated by me as >), was found almost exclusively, and the other forms 

 only in a few specimens, while among those from the dr}' season, there 

 were, besides the same 9 of the -i form, at least just as many of the ? 

 form, though only such, of which the upper-side has become just as pale 

 as that of te ■'I form ones, but on the under-side still showing man)- remains 

 of the red pigment, which are no more to be found in the 1 form. That 



