1906.] OiSr THE LEPIDOPTERA OF THE TIBET COMMISSION. 481 



10. CoLiAS DUBiA, sp. n. (Plate XXXYI. figs. 8 J , 9 $ .) 

 Though very unwilling to add a new name to this difficult 

 genus, which already suffers from much synonymy, I am unable to 

 avoid so doing under the following circumstances, which I will 

 describe chronologically : — 



1. In 1865 Felder described from Ladak as G. eogene a large 

 brilliant form which is now- known to have a very wide range in 

 Central Asia and to vaiy extremely, though the males without 

 exception have a black unspotted marginal band on both wings. 



2. In 1878 Moore described as C. stoliczkana a small high- 

 Alpine form of this or possibly a distinct, species (cf. Elwes in 

 J.A.S.B. 1898, p. 465). 



3. In 1893 Griim, in Hor. Soc. Ent. Koss. xxv. p. 477, described 

 as eogene var. leechi a female collected by McArthur in Ladak, of 

 which the type is now in the British Museum. 



4. In 1904 Col. Fawcett {cf. P. Z. S. 1904, ii. pi. ix. figs. 10, 10 a) 

 referred a species which now turns out to be quite distinct to var. 

 leechi Griim. I may say that Colias cocandica var. leechi Elwes, 

 J. B. N. H. S. xi. p. 466, though it belongs to the same section 

 and comes from the same valley in Ladak, the Chonging Valley, 

 is a distinct species of a much paler colour and different pattern. 



5. In 1903 Fruhstorfer described first in the ' Insekten-Bbrse' 

 and afterwards in the 'Iris,' vol. xvii. p. 48, t. 1. 3 c?, 4 5, a 

 Colias from Alpine Sikhim as C. eogene miranda, which was stated 

 by Col. Fawcett to have been described from his figures; but 

 Mr. W. Rothschild has kindly lent me for comparison three 

 specimens sent him by Fruhstorfer, of which two males are un- 

 doubtedly stoliczkana, and the female marked type is apparently 

 the same species, but not the specimen figured by Fawcett, of 

 which the female figured in the ' Iiis ' might be a bad copy. In 

 J. B. ISr. H. S. I. c. I mentioned as probably closely allied to 

 stoliczkana a pair of small Colias from Alpine Sikhim, of which 

 the male, being badly rubbed, did not show clearly what I 

 now see in fresher specimens, namely, that the borders are 

 distinctly spotted. In 1904, writing of these specimens in 

 the ' Iris,' p. 390, and having no fresh male of the species before 

 me, I still confused them with the specimens sent as miranda by 

 Fruhstorfer to Mr. Rothschild ; but now, on receipt of a pair, of 

 which the male is from Khamba Jong and the female from the 

 Lhanak Valley, I find them identical with my old pair, and, so far 

 as Mr. Heron, Col. Bingham, and myself can judge, they must 

 have a new name. 



The species might be regarded as a distant relative of 

 cocandica, but the orange colour is much deeper than in any 

 specimen of that species ; and as the variety which, geographically, 

 comes nearest (var. leechi Griim) is most unlike dithia in colour, 

 I dismiss this theory. If we could adopt the assumption that 

 stoliczkana was in this locality sexually dimorphic, having the 

 males with spotted bands like the females, the difficulty would be 

 solved ; but with the exception, perhaps, of C. hoothii Curt, we 



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