1895.] L. de Niceville & Dr. L. Mavtin — Butterflies of Sumatra. 487 



523. *Delias egialea, Cramer. 



"Wallace. Snellen. Staudinger. Kirby. A Javan species, which 

 may perhaps occur at the south-eastern end of Sumatra. 



524. Delias tobahana, Rogenhofer. 



D. tobahana, Kogenhofer, Verh. zool.-bot. Gesellsch. Wien, vol. xlii, p. 571, n. 1 

 (1893); id., Mitis, Iris, vol. vi, p. 102, n. 13, pi. ii, fig. 1, female (end of January, 

 1893). 



D. derceto, de Niceville, Journ. Bomb. Nat. Hist. Soc., vol. vii, p. 557, n. 12 

 (23rd April, 1893) ; idem, id., 1. c, vol. viii, p. 52, n. 12, pi. L, fig. 4, male (1893). 



Rogenhofer. Hagen. Originally described by Herr Rogenhofer 

 and I from Sumatra. Found only on the Central Plateau in the Toba 

 and Karo districts, where it is by no means common, and strange to say, 

 the males rarer than the females. Dr. Martin has specimens taken only 

 in March, May, June, July, and September. It is of very delicate struc- 

 ture, and seldom seen perfect. 



525. Delias belladonna, Fabricius. 



Pieris chrysorrhcea, Vollenhoven, Mon. Pierides, p. 6, n. 3, pi. ii, fig. 4, male 

 (1865). 



Kirby as chrysorrhcea [sic]. I do not propose in this place to 

 discuss the innumerable forms of this species which have been 

 described and named, of which von Mitis enumerates seven " varieties" 

 besides the type, and has omitted two others, D. hearseyi and 1). boyleae, 

 both of Butler. To these names I have to add the "Pieris " chrysorrhcea 

 of Vollenhoven, described from the mountains in the interior of 

 Sumatra. This species does not appear to have ever been properly 

 understood, even von Mitis in his recent Monograph of the genus 

 does not put it in the same group as D. belladonna. The figure differs 

 from our specimens of D. belladonna from the Battak mountains in 

 having the white areas on the upperside of both wings, but especially 

 of the hindwing, larger and more or less coalescing. The figure does 

 not show the characteristic yellow spot at the base of the hindwing 

 on the upperside owing to the way the specimen drawn was set, the 

 costa of the hindwing being broadly covered over by the forewing. 

 The non-perception of this spot is probably the cause that the species 

 appears never to have been recognised until now, combined with the 

 fact that D. belladonna in none of its forms was ever suspected to 

 occur in the region of the equator. The vast stretch of country between 

 Assam, the most southernly point hitherto known for D. belladonna, 

 and Sumatra has however been partially bridged over by the discovery 

 of the butterfly by Capt. E. Y. Watson in the Chin and Shan Hills of 



