ADDITIONS AND CORRECTIONS TO BUTTERFLY LISTS. 427 



three faint spots : on the hi'ndwing below the spots are much as in colaca 

 though smaller and there is often a spot in 1. The only other skipper that 

 might be confused with the above is female subochracea, which I have never 

 seen ; the kumara and conjuncta groups run much larger over 1^ inches 

 instead of about 1\ inches. 



127a. Suastus robsonii. — One specimen caught at Jabalpur in March 

 1906 : it agrees well with De Niceville's description, but I am not sure that 

 robsonii will not eventually turn out to be merely a casual aberration of 

 gremius. 



128a. Sarangesa dasahara. — Common after the rains in Pachmarhi and 

 I am surprised that Mr. Betham overlooked it. 



I should like to take this opportunity to describe what I think is a new 

 Nacaduba from Sikkim. 



Nacaduba sivoka n. sp. In May 1906 I caught 3 specimens of a Nacaduba 

 in some jungle at Sivoke in the Teesta Valley, Sikkim. They are allied to 

 but distinct from ardates. Two are brown above with a few blue scales 

 scattered on the disc : the third is brown with a large iridescent blue white 

 patch on the disc of the forewing and some ill defined white patches on the 

 hindwing, the discocellulars are defined with black on the forewing. 

 Underneath the ground colour is pale golden yellow with light brown 

 markings and fasciae arranged as in ardates except that the basal fascia 

 on the forewing does not extend to vein 1 : the apical spot of the submargi- 

 nal series on the hindwing is much enlarged being as large as the usual 

 pre-anal spot. The termen of the forewing is very convex, much more so 

 than in either sex of ardates : but for this last feature it seems to very 

 closely resemble N. noreia. It seems to be very close indeed to what De 

 Niceville talks of as N. lutea in the Society's Journal Vol. X, p. 36, I 

 could have obtained many more of the insect, but it never struck me at the 

 time that it was anything unusual. 



