522 L. de Niceville & Dr. L. Martin — Butterflies of Sumatra. [Ko. 3, 



Originally described from the Malay Peninsula and is a local race of P. cau- 

 nus, Westwood, of Java. It is one of a group which are amongst the most 

 perfect mimics known, their models being the different local races of 

 Euploea diocletianus, Fabricius. It is very rare, Dr. Martin in thirteen 

 years has obtained two specimens only, both males, in forest near Selesseh, 

 the first on 23rd April, 1893, the second on 15th July, 1894. The first 

 was captured by a very clever Chinese collector, who watched and 

 followed the butterfly for nearly half the day before he was able to 

 catch it. He correctly took it for a Papilio, but thought it might be a 

 female of P. butleri, Janson. Rothschild records this species from 

 Sumatra as P. cannus tegialus, Distant, and notes that " The type- 

 specimen of P. segiulus, Distant, now in my collection, does not differ 

 from that of P. velutinus, Butler, in the British Museum, except in the 

 submarginal markings of the hindwing, which are a little smaller in 

 P. velutinus; one of my three P. eegialns from the Malay Peninsula has 

 these spots, however, not larger than the type of P. velutinus." 



594. Papilio (Achillides) arjuna, Horsfield. 



P. arjuna, Horsfield, var. gedeensis, Fruhstorfer, Ent. Nach., vol. xix, p. 287 

 (1893) ; idem, id., Stet. Ent. Zeit., vol. lv, p. 118 (1894). 



Wallace. Hagen. Staudinger. Herr H. Fruhstorfer has recently 

 described not only P. gedeensis from W. Java and Sumatra, but also 

 P. prillwitzi from W. Java, and P. tenggerensis from E. Java, while 

 admitting the occurrence of P. arjuna also in Java. I have not suffi- 

 cient material to form an opinion as to whether or not all these four 

 species (five including P. hama, Felder), all closely allied, and from 

 one island, are distinct and valid. Herr Fruhstorfer has sent me 

 specimens of P. gedeensis from Java which agree with my Sumatran 

 examples of P. arjuna. They differ from Horsfield's figure of the 

 latter in lacking a pale green band across the disc of the fore- 

 wing on the upperside. In Sumatra specimens are found with and 

 without the green band; the latter are the commoner. Further obser- 

 vations appear to be necessary before Herr Fruhstorfer's species 

 can be accepted. P. arjuna in Sumatra is restricted to the Central 

 Plateau, where it is common and flies throughout the year, as the 

 collectors brought in specimens in every month. Is not nearly so 

 shy or quick on the wing as P. palinurus, Fabricius. Rothschild 

 places P. tenggerensis as a pure synonym of P. arjuna ; he gives 

 P. gedeensis as P. arjuna, Horsfield, (a 2 ), ab. gedeensis, Fruhstorfer; 

 and allows P. prilhvitzi full specific rank. 



