120 



BUTTEKFLIES, 



rains. Intermediate forms are found -when there is heavy rain at the 

 commencement of the year. It occurs commonly in the Khasi Hills 

 and in Upper Bm'mah. 



19. Mycalesis (Orsotrisena) medus, Fabricius. 



Occurs at low elevations only, and is fairly common. M. medus 

 is the wet-season, ocellated form ; while M. runeka, Moore, is the dry- 

 season, non-ocellated form. This latter is found with or without the 

 median white band on the underside. 



20. Mycalesis (Calysisme) peeseus, Fabricius. 



Rare in the low valleys. 31. pcrscus is the dry-season form, 

 while M. blasius, Fabricius, is the wet-season form. 



21. Mycalesis (Calysisme) mineus, Linnaeus. 



Mr. Moore records this species from Sikhim. The wet-season 

 form is 3L minciis, while the dry-season form is 31. otrea, Cramer. 



22. Mycalesis (Calysisme) visala, Moore. 



This is the commonest species of the genus occurring in Sikhim, 

 and is found up to about 5,000 feet elevation above the sea. 

 31. visala was named from a dry-season form ; the wet-season form has 

 not been named. Mr. Moore thus describes the male secondary 

 sexual characters of il/. mineus and 31. visala: — 



M. mineus. 



Upperside, hindwing, ■with a sub- 

 basal tuft of pale oclireous hairs over- 

 lapping a glandular patch of llackiah 

 scales. 



Underside, forewing, with a glandu- 

 lar patch of blackish scales on the mid- 

 dle of the submedian nervure. The 

 patch, as seen under the microscope, is 

 composed of densely-packed but loosely 

 raised, overlapping, large, broad, 

 oval scales with even front edges. 

 Compared with the patch of yellow 

 scales on the forewing of M. risala, 

 that of M. mineus is two-thirds 

 less in size, the scales are less 

 closely packed, are more laxly raised, 

 and are narrower both anteriorly and 

 posteriorly. 



M. risala, 



Upperside, hindwing, with an elongat- 

 ed glandular patch of pale yellow scales, 

 overlapped by the subbasal yellow tuft ; 

 these scales being of exactly the same 

 size, form, and disposition, as those pre- 

 sent on the patch on the underside of the 

 forewing, the overlapping hairy tuft con- 

 sisting of long straight filaments, each 

 arising from a distinctly visible minute 

 round pore. 



Underside, forewing has the glandular 

 patch on tlie submedian nervure two-thirds 

 larger than that in M. mineus, extend- 

 ing from the middle of the vein to the trans- 

 verse discal pale band, and is composed 

 oipale i/ellotv scales; these scales (as seen 

 under the microscope) are very densely 

 packed, overlap each other, are slightly 

 raised, are large and rather long, broad 

 and somewhat broadest anteriorly, with 

 evenly-rounded fi-ont edge, and very short 

 peduncle ; no slender intervening scales 

 present ; — tliis patch in M. mineus being 

 short, situated on the middle of the vein, 

 and composed of differently-shaped 

 blackish scales. 



