352 M. A. Avinoff on 



markings on the underside is incomplete. It is especially the 

 three patches in the interspaces 2-5 and on that are marked the 

 red scales lacking entirely on this species in both sexes on both 

 surfaces. The inner outline of the basal dark part runs parallel 

 to the inner margin. A dark crescent in the cell seems to be 

 formed by modified black outlines of the obliterated basal and 

 anal red eyelets. The latter row of dark lunulae is similar to 

 these markings of acco. 



The comparison of the dark basal area of hiinnyngtoni and acco 

 sliows the former is very different, as in the latter species this area 

 has an irregular contour near the central cell. 



The upperside of the male presents a very strong reduction of 

 dark markings compared with acco. There are three dark mark- 

 ings in the discocellular, and merely rudiments of the semi-trans- 

 parent fuscous bands at the costal margin. The hindwing has no 

 central markings at all, the whole pattern consisting of the sub- 

 marginal lunulae on the black basal area. The markings in inter- 

 spaces 5 and 7 are slightly seen on the upper surface, due to the 

 transparency of the wing. 



The female has more developed dark markings. The two dark 

 patches of the secondaries corresponding to the usual red eyelets 

 are not largo and stripe-like. The markings between them forming 

 an uninterrupted curved band are seen only by transmitted light. 



The size of this species hardly reaches that of the smaller simo 

 forms. The cilia are very long and of the whitish ground-colour 

 of the wings. 



The antennae are yellowish grej', gradually darkening at the 

 extremity. The legs are pinkish. The corneous pouch of the 

 female, being of the general shape and formation of that of acco, 

 is comparatively shorter and does not reach so far in surrounding 

 the upper part of the body. 



Parnassius acco, Gray, subsp. hampsoni, iiov. (Plate Lll, 



fig- 4.) 

 The genuine acco is rather a larger butterfly with heavy 

 dark markings and well-developed red ocelli. So are the 

 acco caught during my expedition through Central Asia 

 in 1912,* in Eastern Ladak and Rupshu. The Kara-Korum 

 form is smaller, the markings are less heavy, especially the 

 antemarginal lunulae of the secondaries are reduced in 



* I have had the honour of making a report of this expedition, 

 on Feb. 5th, 1913, at the meeting of the Entomological Society, 

 vide Proceedings, 1913, pp. xi, xii. 



