on the genus Colias. 



15 



C. ThUoa, (?,$._ 



Under side of hind wings not more 

 velvety than in Edn'^o, Myrmi- 

 done, &c. 



Pattern of the under side of hind 

 wings distinct, the submarginal 

 spots distinctly marked. 



In the male the central black spot 

 of the hind wings never mixed 

 with scales of the ground colour. 



In the male the black border al- 

 ways distinctly marked. 



The wings of the male always very 

 sharp at the apex, and the wings 

 broader than in Staudhnierl. 



The wings of the male below with 

 more lines. 



C. Staudingeri, ^ , J • 

 Under side of hind wings more 

 velvety even than C. Heel a. 



Pattern of under side of hind 

 wings very indistinct; the sub- 

 marginal spots indistinct, or 

 entirely lost in the ground 

 colour. 



The same black spot is always 

 mixed with scales of the ground 

 colour, and in some cases quite 

 effaced by them. 



The border not distinctly marked, 

 but the colours shading into 

 each other. 



The wings longer and more 

 rounded at the apex. 



The wings covered with larger 

 scales, giving a mealy appear- 

 ance. 



I expect that the nearest alHance of C. Staudingeri is 

 with C. Eogene, Feld., from the northern form of which, 

 C. Theia, Stgr., it is not very different ; and agrees with 

 both these in the great elevation of its range, and in the 

 absence of the basal patch on the hind wing. 



Colias Viluiensis, Men. 



Men., Schrenk's Eeise, p. 18, pi. 1, fig. 7. 



.'' C. Edusa, var., Trybom, Kon. Vet. Akad. Forh. 

 Stockholm, 1877, No. 6, p. 38. 



This very obscure form seems to be an arctic variety 

 of Chrysotheme. It is placed by Staiidinger with doubt 

 next to Chrysotheme, and is considered by Trybom to 

 be a form of Edusa, if, as he believes, the specimens 

 examined by him which were taken at Dudinska, on the 

 Yenesei River, in lat. 69° 25' N., are the same species as 

 that described and figured by Menetries from the Vilui 

 River, in E. Siberia. The female seems unknown, and 

 no specimen exists in any collection I have seen. There 

 is, however, nothing in the figure or description that I 

 can see by which this form may be certainly dis- 

 tinguished. 



iVofe.— Alpheraky states (Stett. Ent. Zeit., 1883,13.493) 

 that he has seen five males of this species in which the 

 basal patch is absent. He considers it a distinct species 

 on account of the entire absence of the row of black 

 spots on the under side. 



