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XXV. The Butterflies of Mauritius and Bourbon. By 
Lirut.-CoLONEL N. MANpDERS, F.ZS., F.ES, 
[Read October 4th, 1907.] 
PLATE XXIX. 
It is now more than forty years since Mr. Trimen published 
his paper on the butterflies of Mauritius in the Transactions 
of this Society, and as far as I know nothing has been 
written on the subject in the interval. It is perhaps as 
well that the lst of butterflies occurring in Mauritius 
should be brought up to date, and if some forty years 
hence another entomologist should add his experiences, 
the Society would be in possession of an entomological 
history extending over a hundred years, and of some 
valuable facts regarding the constant ebb and flow of 
butterfly life in that island. In the present paper I add 
five insects to Trimen’s list, namely Papilio demodocus, 
Cacyreus lingeus, Zizera antanossa, Zizera gaika and Naca- 
duba mandersi, Druce. The specimen of Libythea cinyras 
still remains unique, and another species, Salamis auqus- 
tina, is extinct or virtually so. One of Trimen’s insects, 
Catopsilia rhadia, | have removed as being a synonym of 
C. florella, thus making the total number of Mauritius 
butterflies thirty. Changes of nomenclature are somewhat 
frequent, and I have mostly followed Aurivillius (“ Rhopa- 
locera Aithiopica,’ 1898). I have at the same time given 
the names and the number of the insects used by Trimen in 
the above mentioned paper, as it is still used by local 
entomologists who might otherwise be puzzled by my list. 
Trimen’s list was admittedly incomplete, as his stay in the 
island was short and quite at the most unfavourable season 
of the year for collecting; it is therefore a matter of 
surprise that he managed to obtain as many species as he 
did. The investigations of the last forty years show con- 
clusively that the whole of the butterfly-fauna of these 
islands is entirely African, and probably mostly derived, as 
we should expect, from Madagascar. 
As Mauritius, and even more so Bourbon (or Réunion, 
as it is invariably called by the inhabitants), are but little 
TRANS, ENT. SOC. LOND. 1907.—PART IV. (FEB. ’08) 
