1921] MouLTON : Malaysian Butterflies. 165 



The Javan form vulgaroides is very doubtfully separa- 

 ble. Those submitted to me by the Buitenzorg Museum 

 difter from Malay Peninsula forms in having the hyaline cell 

 streak slightly reduced. In this point, however, they agree 

 well with Bomean specimens. 



8. Danaida juventa Cr. sitali Fruhst. 



Danaida Juventa sttah Fruhstorfer 1910. p. 213. 

 Radena Juventa Distant 1886, p. 407, Tab. XXXIX, fig. 4. 



Loc. Trengganu 5 ^ ^ ; Pahang and Johore : Rumpin 

 and Endau 4$ 5 , 1 $ ; Tioman Island 2$ S, 1 9 (F.M.S. 



Miis.). Auamba Islands: Pulo Siaiitan l5, l9; Pulo 

 Aor 2$ 9 ; Tioman Island 1 $ (Raffles Mus.). 



Distrih. Malay Peninsula and Archipelago to New 

 Guinea and the Solomon Islands. The sid)species recog- 

 nized in the Malaysian subregion are : — 



D. /. juventa Cr. Java and Bali. 



D. j. mincia Fruhst. Bawean I. 



D. y. longa Doh. Engano I. 



D. j. krakatauae Moulton Krakatau I. and Verlaten I. 



D. ). robinsoni Boths. Sumatra. 



D. /. sitah Fruhst. Anamba Is., Natuna Is. and 



Malay Peninsula. 



D. j. kinitis Fruhst. North Borneo. 



The above record from Trengganu (Lat. 6° N.) repre- 

 sents the northern Umit to the range of this species. It is 

 not recorded from Siam. 



Fruhstorfer suggests that reports of the occurrence of 

 juventa in Malacca and Perak are possibly due to recent 

 migration, as the species is typically insular. The occur- 

 rence of specimens on the east coast of the Peninsula in 

 no way diltcring from Tioman Island or example" from the 

 Anamba Islands tends to confirm Fruhstorfer's theory. 

 Distant {I.e.) recorded one from Singapore. The example 

 figured by him is perhaps referable to this subspecies, 

 although the underside is brown rather than black. 



Fruhstorfer noticed its absence from Sumatra, but 

 Rothschild ^ has now described a new subspecies, D. j. 

 robinsoni, from the west coast of Sumatra. Another new 

 subspecies, D. j. krakatauae, from the small islands of 

 Krakatau and Verlaten, between Sumatra and Java, is des- 

 cribed below. 



A single male in the Raffles Museum labelled " Johore " 

 appears to be typical juventa and possibly comes from 

 Java. It differs from the above-mentioned examples of 

 sitah in the yellower shade of ground-colour, i.e. lacking the 

 pale green tint of sitah, in the dark colouring b'^neath being 

 brown rather than blackish-brown as in sit(di, m the margi- 

 nal spots above being smaller and the veins less heav5y 

 marked with brown-fuscous. 



' BOTHSCHILD, 1920, p. 148. 



