294 LYC&NID./E. 



066. Gerydus croton, Doherty, J. A. S. B. 1889, p. 4 

 de N. Butt. Ind. iii, 1890, p. 25. 



S . Upperside : rich dark brown. Fore wing : a narrow very 

 oblique discal macular streak white, extending from just beyond 

 lower apex of cell to just above the tornal angle, the lower two of 

 the spots that compose it small, widely separated and sometimes 

 obsolescent. Hind wing : immaculate. Underside : paler brown, 

 in some specimens darker, in others with a purplish gloss espe- 

 cially on the hind wing. Fore wing : the discal band as on the 

 upperside but broader, more distinctly defined, and varying from 

 white to pale ochraceous ; the area below it and up to the base of 

 the wing very dark brown ; some obscure annular markings along 

 the costal and on the apical areas. Hind wing : crossed by a 

 basal, subbasal, prediscal, discal and postdiscal annular bands, 

 always obscure and more or less broken and interrupted, the 

 edges of the bands darker than the ground-colour of the wing. 

 Antennae, head, thorax and abdomen dark brown ; beneath : the 

 palpi, thorax and abdomen slightly paler brown. $ . Upperside : 

 similar, the basal half of the fore and the whole surface of the 

 hind wings much paler than the apical half of the fore wing ; 

 the dark and light brown shades on this wing divided by an 

 oblique white macular streak as in the <3 , only much broader, 

 with its upper end extended through apex of cell almost to the 

 costa, and the two spots at its lower end lai'ger, always clearly 

 defined. Underside : pale ochraceous brown. Fore wing : the 

 white streak on the upperside replaced by a large white medial 

 patch extended to the middle of the dorsum, the outer edge 

 irregularly festooned and its centre occupied by a very dark, 

 broad, fuscous streak, that extends outwards from the base of the 

 wing but does not attain the brown on the apical area; costa. 

 and apical areas with the appearance of obscure dark-edged 

 annular markings. Hind wing : crossed by similar annular 

 markings that are always interrupted and broken. Both fore 

 and hind wings with a subterminal line of minute black dots. 

 Antennae, head, thorax and abdomen coloured like those of the 

 male, but generally paler. 



Exp. <5 2 43-50 mm. (1 -70-1-98"). 



Hob. So far recorded only from Tenasserim and Upper Burma. 



I am in doubt whether this is not a large form of G. boisduvali 

 from well-fed larvae that pupate and come to maturity during the 

 rainy season ; but in the .lour. Bomb. Nat. Hist. Soc. xii, 1898, 

 at p. 142, the late Mr. de Kiceville stated that the males of 

 G. boisduvali had, and the males of G. o-oton had not, the sex- 

 mark peculiar to Gerydus. This is so in the few specimens of 

 the males of the two forms that I have had an opportunity of 

 examining, arid may serve further to distinguish small males 

 of croton from large males of boisduvcdi. 



