COLIAS. 243 



along the costa and termen of the fore and suffusing the whole 

 surface of the hind wing much darker and richer in tint than in 

 fieldi. Antennae brownish pink ; head, thorax and abdomen dusky 

 black ; beneath : palpi dusky grey, thorax and abdomen greenish. 

 The sex-mark of modified scales at the base of interspace 7 

 on the upperside of the hind wing so conspicuous in fieldi entirely 

 absent. $ . Upperside : ground-colour sometimes orange-yellow, 

 sometimes white. Fore wing : a discocellular spot and a band 

 occupying nearly the terminal third of the wing black, the latter 

 traversed by a transverse series of more or less equal elongate 

 spots. In the specimens that have the ground-colour orange, 

 these spots and a broad band along the costal margin are bright 

 yellow ; in the others the spots are white and there is no band 

 of colour other than the ground-colour along the costa. Hind 

 wing: more or less diffusely irrorated with black scales, those on the 

 apex and terminal margin anteriorly coalesce and form an ill- 

 defined broad black band, which however in all specimens fades 

 out posteriorly, never extending to the tornus ; this ill-defined 

 band more or less traversed by a subterminal transverse curved 

 series of elongate spots of the ground-colour; dorsum broadlv 

 pale greenish-yellow or white ; discocellular spot large and bright 

 orange. In some specimens the irroration of black scales on the 

 posterior two-thirds of the wing gets so sparse towards the 

 termen as to give that portion the appearance of being terminally 

 bright yellow or white. Underside : as in the d 1 , but the green- 

 coloured areas more greyish green ; some specimens with merely 

 a faint trace of that colour ; all the veins paler and terminally 

 conspicuously whitish yellow. 



Exp. d $ '46-56 mm. (1-8-2-2"). 



Hab. Described originally from specimens taken by the Second 

 Tarkand Mission north of Changla in Ladak, at 17,000 feet ; 

 N.W. Himalayas : Kashmir, Khardong Pass ; Sikhim above 

 15,000 feet. 



638. Colias croceus, Fourcroy (Papilio), Ent. Paris, ii, 1785, p. 250. 

 Papilio edusa, Fain-. Mant. Ins. ii, 1787, p. 23. 



Race fieldi (Plate XV, fig. 103). 



Colias fieldi, Men. Cat. Mus. Petr., Lep. i, 1855, p. 79, pi. 1, fig. 5; 

 Moore, P. Z. S. 1874, p. 273 ; Ehves, Trans. Ent. Soc. 1880, 

 p. 136 ; id. 1. c. 1884, pp. 5 & 7. 



Race fieldi, Men. tf . Upperside i deep cadmium orange-yellow. 

 Fore wing : a patch of greenish-black scales at extreme base, a pear- 

 shaped black spot on the discocellulars and a broad terminal black 

 border ; the last occupies about a fourth of the wing and has its 

 inner margin curved slightly and irregularly crenulate, broader at 

 apex and the tornus than in the middle ; the end portions of veins 

 6, 7, 9 and 10 subterminally pale and conspicuous on the black of 

 the apex. Hind wing : a thin covering of long soft hairs at base, 

 beneath which is a dusting of black scales that is continued 



R2 



