438 PAPILIOXID.E. 
Colias fieldii. (Plate XXXV. figs. G J , 7 $ . ) 
Colias fieldii, Meuetries, Cat. Mus. Petr. i. p. 79, pi. i. fig. 5 (1855). 
"Cette Colias est iutermediare entre la C. myrmidone et Yedusa; les ailes supt'rieures sont eu 
dossils de la meme teinte jaune de la myrmidone, et leur dessin se distingue seulement de 
eclui Ae Yedusa en ce que la base est plus largement noire, et le point discoidal est plus gros, 
surtout en dessous oii il offre au milieu une pupille quelquefois double. d"un beau blanc. Les 
ailes inferieures sont semblables a celles de la myrmidone, mais en dessus. la bordure noire 
est un peu plus large sur le bord externe, la base est plus fortement saupoudree de noir, et 
non loin de la base, sur le bord anterieur, est une tache d'un jaune moins rougeatre que la 
teinte generale de I'aile ; cette tache est limitee par la bordure noire externe, qui d'abord 
etroite, remonte en s'elargissant jusqu'a cette tache jaune, quelle rejoint par des atomes 
uoirs et serres ; ees ailes en. dessous ressemblent compK-tement a celles de I'edusa. Vu 
exemplaire male de moite plus petit, ne m'a rien offert de particulier, et je I'eusse confondu 
volontiers avec une edusa, si je n'eus appereu la tache jaune de la base du bord anterieur des 
secondes ailes. 
"Cette espeeevient des ilonts Himulaj'a, et nous a etc donnee par il. Field, qui s'occupe d'histoire 
naturelle." (Menetries, I. c.) 
Agrees in colour with C. myrmidone, Esper, but the markings are almost exactly like those of 
C. edusa, Fabricius ; the fringes of primaries, however, are rarely chequered, the black 
discoidal spot is generally larger, and the black border of secondaries is continued along the 
costa of these wings to the base. On the under surface the black discoidal spot of primaries 
is always centred with silvery white, and the outer edge of the purplish -brown patch upon 
which the discoidal spots of secondaries are placed is acutely produced. 
Expanse, d 4S-66 millim., $ 49-72 millim. 
Common and widely distributed in Central and Western China. 
As a rule the males from China are larger and brighter-coloured than 
Himalayan examples of the same sex, and the discoidal spot on primaries is 
of greater size. The females are very variable in colour, some being a pale 
yellow, and others a bright orange ; the pale submarginal spots may be either 
well-defined or almost absent. 
C. fieldii is very abundant in the North-west Himalayas throughout the 
summer. It is common in Sikkim, and flies at an elevation of over 6000 feet. 
I took a white female specimen of this species in Kashmir ; this form, which 
corresponds to C. edusa, var. helice, is exceedingly rare, and I have not 
received a single example of it among the large number of C. fieldii sent to 
me from China. 
M. Grura-Grshimailo obtained specimens in the Man-shan Mountains, 
Tliibet. 
Distribution. Himalayas, Thibet, Central and AVesteru China. 
