202 LYC/ENID. CASTALIUS. 
ExpANSE: &, 2, 1'0 to 1°3 inches. 
DESCRIPTION: MALE and FEMALE. ‘* UPPERSIDE, both wings dark brown, crossed by 
a common broad band of white commencing at the lower discoidal nervule of the forewing 
where it projects towards the outer margin. UNDERSIDE, do/h wings white. Forewing with 
a small spot at the base, a band before the middle, a large spot on the costal margin near the 
apex, a large spot at the anal angle ; the apex (which is marked by two white spots), the outer 
margin and a spot at its middle, all dark brown. Hindwing with a band near the base, a small 
spot on the inner margin, a large spot below this, a bifid spot near the apex, a spot between 
these, and a series of submarginal lunular spots, all dark brown.” (Hewztson, 1. c-) 
Mr. E. E. Green sends me the following note on the transformations of this species in 
Ceylon under the name C. Aamatus, Moore. “LARVA feeds upon the leaves of Gonania 
microcarpa. Colour pale bright green, with two dorsal stripes of a darker shade; a lateral 
fringe of very fine soft hairs ; segments expanded laterally into small flattish lobes. PUPA 
pale pink, minutely speckled with brown, and with a dark brown median line.” 
The butterfly is found in the ‘‘ Western and Central Provinces of Ceylon. Plains and 
Hills up to 4,000 feet. Common in low-country forests from June to October. Fits about the 
tops of shrubs and low trees, settling among the leaves.” (Hutchison in Lep. Cey.) 
‘°C. decidia, Hewitson, C. hamatus, Moore, and C, interruptus, de Nicéville, are probably 
all forms of one species, differing only in the extent of the black markings, which are more 
extensive in the first, less so in the second, and still more restricted in the last. C. decidia 
is found commonly on the lower slopes of the Nilgiris.” (G. 7. Hampson). Mr. Hampson has 
made a slight mistake, itis C. Aamatus, and not C. decidia, which has the black markings on the 
underside the most extensive. 
“J believe, but am not quite certain, that I have caught C. decidia in Bombay. It is not 
uncommon on the hills.”’ (4ztken, Journ. Bombay Nat. Hist. Soc., vol. 1, p. 217, n. 59 (1886). 
C. decidia exhibits seasonal dimorphism to a greater extent even than C. e/ua, Hewitson, 
and exactly in the same direction. It has not been so fortunate, however, as that species in 
having these forms unnamed. In all localities where there are two well-marked seasons, we 
find C. decidia putting forth corresponding varieties, the darkest form of course occurring in 
the middle of the rains, the lightest in the middle of the dry-season, and intermediate forms 
between these seasons. I give below as foot-notes the descriptions of C. hamatus, Moore, and 
C. interruptus, mihi.* 
* Castaliuns hamatus, Moore, Lep. Cey., vol. i, p. 84, pl. xxxvi, figs. 6, 6a (1881). HasiratT: Nilgiris 
(Hampson), Ceylon (Moore). ExpansE: Male and female, 1'25 inches. DESCRIPTION : ‘“* MALE. UPPERSIDE, 
both wes dark violet-black, with a narrow white medial discal transverse band, which is attenuated and 
hooked outwards at its anterior end below the costa [on the forewing], the band on both wings is also crossed 
by black veins, and thickly black-speckled on the hindwing. Cydia white alternated with black. UNDERSIDE, 
both wings white. Forewing with [a spotatthe base], a broad black subbasal band curving inwards from the costa, 
an oblique short subapical and a lower discal band, a marginal lunular band which is dilated at both ends and 
projected inwards from the middle. Hindwing with a black basal curved band, a small contiguous spot on the 
abdominal margin, a large upper and lower irregular discal spots, and a smaller intervening spot, a Marginal row 
of luaules. FemAca&. Uprersipe, doth wings with the white band broader and more acutely hooked in the forewing 
than in the male. UNbEkSIDE, doth wings asin the male. Padgi black above. Legs black with white bands.” 
(.YWoore, |. c.) 
“Galle and Kandy. Very common.’’ (Wade). ‘* Found rarely on the lower slopes of the Nilgiris.” 
(G. F. Hampson). 
Castalins interruptus, de Nicéville, Journ. A. S. B., vol. lii, pt. 2, p. 74, n. 13, pl. i, fig. 12, 
Zemale (1883); id, Moore, Proc. Zool. Soc. Lond., 1883, p. 523, pl. xlvili, fig. 4. Hapitat : Bombay; 
Rohilkund Terai; Bholahat, Malda; Sikkim; Shillong, Assam; Khurda, Orissa; Nilgiris. ExpaNnsE: 
too to 1°20 inches. Description. ‘‘ MALE and FEMALE. UppkrsIDE, 40th wings pure white. Forewing with 
the base thickly irrorated with black scales, beyond with a dense black patch widest on the costa, inwardly 
recurved below the submedian nervure, from whence it suddenly narrows. In some specimens the irrorated 
black scales at the base of the wing and the black patch beyond are entirely merged into one black 
basal patch, and the costa throughout is widely black. The apex widely, the outer marginas far as the 
first median nervule less widely, then to the inner margin more widely again deep black ; with a round 
black spot above the first median neryule coalescing with the black border, this spot is sometimes entirely 
separated, in other specimens very indistinct, and lastly in others its form is entirely lost in the black margin, 
Hindwing with the immediate base and a few irrorated spots beyond black, the outer margin also black, 
enclosing immediately within a black anteciliary fine line a more or less prominent and complete series of 
white oblong marks between the nervules. UNpERsipDg, 40th wings with the markings arranged as in C. Aamatus, 
Moore, but smaller and more restricted, especially on the Aindwing. Cilia on both sides on both wings white, 
