1895.] L. de Niceville & Dr. L. Martin — Butterflies of Sumatra. 379 



form of one and the same species ; the latter is not found in Sumatra. 

 HI. lalassis is confined to Gilolo and Amboina according - to Mr. Moore. 

 Not uncommon in tlie plains, bat occurs less frequently than M. mine us, 

 Linnaeus, and M. horsfieldii, Moore. 



53. *Mycalesis (Calysisme) polydecta, Cramer. 



Snellen as justina. Butler. Mr. Moore gives the ll Papilio" justina, 

 Cramer, which was described from the Coromandel Coast of South 

 India, as a synonym of AT polydecta, and restricts the species to Eastern, 

 Central, and Southern India, and Ceylon. As the figure of M. justina 

 is very similar to the wet-season form of M. mineus, Linnaeus, while the 

 figure of M. polydecta reminds one at once of the recently-described 

 M. horsfieldii, Moore, it is, I think, probable that Messrs. Snellen and 

 Butler have incorrectly recorded this species from Sumatra. Dr. Hagen 

 gives M. justina as a synonym of M. mineus. 



54. Mtcalesis (Calysisme) mineus, Linnaeus. 



Hewitson. Gi'ose Smith as ostrea. Hagen as drusia, and as mineus, 

 Butler [sic]. Distant. Mr. Moore considers that both M. mineus and 

 M. drusia, Cramer, represent the wet-season form of one and the same 

 species. No dry-season form of it (If. otrea, Cramer, nee M. ostrea, 

 Westwood, which also equals the dry-season form of M. mineus), occurs 

 in Sumatra. It is the commonest species of Mycalesis found in the island, 

 and flies everywhere with M. medus, Fabricius, where there is grass 

 and a little jungle for it to retire into. 



55. Mycalesis (Calysisme) horsfieldii, Moore. 



Calysisme horsfieldii, Moore, Lep. Ind., vol. i, p. 197, pi. lxvi, figs. 2, 2a, 2b, male, 

 wet-season form; 2c, dry-season form (1S92). 



The dry- and wet-season forms of this species differ but little. I 

 have specimens also from Nias Island and Java. M. mineus, Linnaeus, 

 Jf. perseus, Fabi'icius, and ilf. horsfieldii all occur at the same time and 

 place, so there can be no question of one being perhaps a seasonal form of 

 the other. Besides, the " male-mai^ks " of the three species differ con- 

 siderably, that of the latter on the upperside of the hindwiug being very 

 much larger than those of the other two species. Dr. Martin has bred this 

 species as well as M. mineus, M. janardana, Moore, and M. anapita, Moore, 

 from eggs laid by confined females ; the larval stage of all four being 

 very similar and not easy to be differentiated, if mixed together. M. hors- 

 fieldii and M. anapita would not eat the common ubiquitous Graminese, 

 60 he had to give them other and rarer kinds of grass, ilf. horsfieldii is 

 common in the plains of Sumatra, the female rarer than the male. 

 J. ii. 48 



