Ixvii 



(2) In D. j)yrmmis the basal red of the hind-wing upperside 

 is bounded by a well-defined dark band ; in D. ninus the 

 corresponding region of the wing is occupied by a broad patch 

 of greyish-blue. 



(3) In D. pyramus the marginal portion of the interspaces 

 in the hind-wing upperside, external to the yellow patch, is 

 occupied by a series of pale streaks; in D. ninus the corre- 

 sponding area is almost uniformly dark. 



The female of D. ninus was not described by Wallace, whose 

 type is a male from Mount Ophir in Malacca ; it is not men- 

 tioned by Fruhstorfer in Seitz's " Lepidoptera," and was 

 unknown to Distant (Rhopalocera Malayana). The Adams 

 Collection in the British Museum contains one specimen of 

 the female, from Perak ; and Dr. K. Jordan has kindly informed 

 me that there are specimens of D. ninus $ in the Museum at 

 Tring. The female in the Adams Collection is like the female 

 of D. pyramus in having the red of the upper surface of the 

 hind-wing bounded by a black band as in D. pyramus, not 

 by a greyish-blue patch as in D. ninus 3. On the other hand, 

 the yellow of the hind-wing upperside is less sufEused with 

 dark scales than in D. pyramus $; and the outline of the 

 fore-wing is rounded, not pointed as in both sexes of the 

 latter insect. 



D. ninus is so far as I am aware confined to the Malay 

 Peninsula, though it has a representative in Sumatra and 

 another in Borneo. I know of no example from further north 

 than Penang. D. pyramus, on the other hand, is mainly a 

 Himalayan butterfly; but its range extends to Burma, and 

 there is a specimen in the British Museum from as far south 

 as East Pegu. Mr. Distant does not include it in the text of 

 his Rhopalocera Malayana, but inserts it in the Appendix 

 to that work on the strength of an example captured by 

 Egerton at Low's Hill in Perak. This was the most southerly 

 record known to me until I saw the specimens now before us.* 

 In view of what had hitherto been known of the respective 

 habitats of these two species, it is somewhat surprising to 



* It is worth noting that Von Mitis(" Iris," 1893, pp. 118, 119) describes 

 a male specimen from Malacca which, though considered by Von Mitis 

 to be a form of nimis, is in some respects transitional to pyramus. 



