348 JOURNAL, BOMBAY NATURAL HISTORY SOCIETY, 1891. 



of which were obtained on one occasion only, and never since, by 

 Mr. H. J. Elwes' native collectors somewhere on the high passes of 

 native Sikkim ten years ago. Mr. Elwes has figured the species, 

 but I am not able to judge from the figure whether the specimen 

 delineated is a male or a female. He describes the male sex only, 

 but the two specimens) I possess, kindly given to me by Mr. Elwes, 

 are certainly females. A„ niackinnonii differs from the same sex of 

 A. altmima on the upperside in its deeper and richer fulvous 

 ground-colour, the marginal series of very pale yellow spots more 

 rounded and usually smaller, the darker ground-colour of the 

 underside, the presence especially of the rich castaneous markings 

 of the hindwing, which, as Mr. Elwes says in his description, and 

 is borne out by my specimens, ''are almost absent" in A. altissima ; 

 the silvery streak in the submediaii interspace of the latter species 

 is also unbroken ; the series of spots placed in the middle of the 

 band of the ground-colour between the discal and marginal rich 

 castaneous bands is far less distinct in A. mackinnonii ; lastly, the 

 silvery marginal spots are considerably shorter and broader in the 

 latter species. 



Mr. P. "W. Mackinnon (after whom I have much pleasure in naming 

 it) obtained through his native collectors seventeen specimens of 

 this species last August below the Gonas Pass on the north face of 

 the hill, about half-way between the Pass and the Baspa Valley, at 

 nearly 11,000 feet elevation, Basahir. The Mia Pass is at the 

 summit of the Nila and Baspa Valleys ; through the former runs 

 the Nila River, S.-E. into the Ganges, while the Baspa River runs 

 through the latter W. into the Sutlej. The Nila Pass is the 

 boundaiy between Tehri Gurwhal and Basahir. The Gonas Pass 

 is one of three or more passes from the valleys to the south which lead 

 into the Baspa Valley. None of these passes are much used by 

 Europeans, so there is not much information available regarding 

 them. 



1 may here note that if the genus Brenthis, Hiibner, is mainly if 

 not wholly based on the fact that the second subcostal nervule of 

 the forewing is emitted from the costal nervure beyond the apex of 

 the discoidal cell, and is maintained as distinct from the genus 



