398 L. de Niceville & Dr. L. Martin — Butterflies of Sumatra. [No. 3, 



from A. vesta, Fabricius, from the Himalayas, Assam, Upper Burma 

 and Java in having the ground-colour more ochreous (less tawny), and 

 all the veins more heavily defined with black. Forewing has a broad 

 costal black margin reaching the subcostal nervure ; the outer margin 

 has the black border nearly twice as broad, with the marginal series 

 of spots of the ground-colour obsolete or entirely absent. Hindwing has 

 the black margin much broader, with the yellow marginal spots very 

 much smaller. Underside, both wings differ only in having all the veins 

 more strongly defined with black. 



Occurs only on the Central Plateau, where it appears to swarm to 

 the same extent as the allied species does in Sikhim and elsewhere. 

 Dr. Martin has had the larva and pupa brought to him by his collec- 

 tors. It flies all the year round, and there is often an over population, 

 after which it becomes somewhat scarce for a while till it recovers itself 

 and again becomes common. 



Subfamily Ntmphalin.e. 



122. Ergolis ariadne, Linnaeus. 



Snellen. Wallace. Hagen. Distant. This species may be known 

 from the one that follows by its richer brighter tawny coloration, by 

 the outer margin of both wings being much more irregular, and in the 

 male by the " male-mark " present on the underside of the forewing, 

 which, in this species, is a solid shining deep black patch reaching 

 from near the inner margin to the third median nervule. Its larva feeds 

 on the stinging creeper, Tragia involucrata. The butterfly is only found 

 in the forest from Bindjei to Bekantschan, and always near its food 

 plant. It has a low flight, only males when fighting fly high in 

 the air. 



123. Ergolis is^us, Wallace 



E. isxus, Wallace, Trans. Ent. Soc. Lond., 1869, p. 333, n. 4. 

 Wallace. Kirby. Hagen as taprobana. Distant. Nearly allied to 

 but quite distinct from E. merione, Cramer. The outer margin of both 

 wings is much more even and regular than in the preceding species, 

 and the coloration is duller and darker. The " male-mark " is in a simi- 

 lar position, but is very inconspicuous and consists of a broad line of 

 modified black scales extending along either side of the veins on the disc 

 of the forewing on the underside, but not reaching the outer margin nor 

 the costa. E. merione has a quite different " male-mark," which is similar 

 to that in E. ariadne, Linnaeus. I have specimens of E. issens from 

 Myitta in Burma and from Singapore ; Wallace records it from Singapore 



