This is a tentative list of butterfly species and subspecies found in Sikkim, an Indian state in northeast India.
Family: Papilionidae Subfamily: Papilioninae Tribe: Leptocircini
Genus: Graphium (swordtails, bluebottles and jays) Species: Graphium cloanthus (glassy bluebottle) Subspecies: Graphium cloanthus cloanthus (Himalayan glassy bluebottle)
Tribe: Papilionini
Species: Papilio bianor (common peacock) Subspecies: Papilio bianor ganesa (east Himalayan common peacock)
Species: Papilio helenus (red Helen) Subspecies: Papilio helenus helenus (Oriental red Helen)
Species: Papilio nephelus (yellow Helen) Subspecies: Papilio nephelus chaon (Khasi yellow Helen)
Family: Pieridae Subfamily: Pierinae Tribe: Pierini
Genus: Delias (Jezebels) Species: Delias agostina (yellow Jezebel) Subspecies: Delias agostina agostina (Sikkim yellow Jezebel)
Genus: Pieris Species: Pieris canidia (Asian cabbage white) Subspecies: Pieris canidia indica (Indian cabbage white)
Family: Lycaenidae Subfamily: Miletinae Tribe: Miletini
Genus: Allotinus Species: Allotinus drumila (crenulate mottle) Subspecies: Allotinus drumila drumila (Himalayan Crenulate Mottle)
Subfamily: Polyommatinae Tribe: Polyommatini
Genus: Acytolepis Species: Acytolepis puspa (common hedge blue) Subspecies: Acytolepis puspa gisca (Himalayan common hedge blue)
Genus: Jamides Species: Jamides alecto (metallic cerulean) Subspecies: Jamides alecto eurysaces (Himalayan metallic cerulean)
Subfamily: Theclinae Tribe: Hypolycaenini
Genus: Hypolycaena Species: Hypolycaena kina (blue tit) Subspecies: Hypolycaena kina kina (Darjeeling blue tit)
Family: Nymphalidae Subfamily: Cyrestinae Genus: Chersonesia Species: Chersonesia risa (common maplet)
Subfamily: Heliconiinae Tribe: Acraeini
Genus: Acraea Species: Acraea issoria (yellow coster)
Subfamily: Libytheinae Genus: Libythea Species: Libythea myrrha (club beak)
Subfamily: Limenitidinae Tribe: Adoliadini
Genus: bassarona Species: Bassarona durga (blue duke) Subspecies: bassarona durga durga (Himalayan blue duke)
Species: Tanaecia julii (common earl) Subspecies: Tanaecia julii appiades (changeable common earl)
Tribe: Limenitidini
Genus: Athyma Species: Athyma jina (Bhutan sergeant) Subspecies: Athyma jina jina (sullied Bhutan sergeant)
Subfamily: Nymphalinae Tribe: Junoniini
Genus: Junonia Species: Junonia iphita (chocolate pansy)
Tribe: Nymphalini
Genus: Aglais Species: Aglais caschmirensis (Indian tortoiseshell) Subspecies: Aglais caschmirensis aesis (Himalayan tortoiseshell)
Subfamily: Pseudergolinae Tribe: Pseudergolini
Genus: Pseudergolis Species: Pseudergolis wedah (tabby)
Genus: Stibochiona Species: Stibochiona nicea (popinjay)
Subfamily: Satyrinae Tribe: Elymniini
Genus: Elymnias Species: Elymnias malelas (spotted palmfly) Subspecies: Elymnias malelas malelas (Bengal spotted palmfly)
Tribe: Satyrini
Genus: Lethe Species: Lethe verma (straight-banded treebrown) Subspecies: Lethe verma sintica (east Himalayan straight-banded treebrown)
Genus: Mycalesis Species: Mycalesis visala (long-branded bushbrown)
Family: Riodinidae Subfamily: Nemeobiinae Tribe: Abisarini
Genus: Abisara Species: Abisara chela (spot Judy) Subspecies: Abisara chela chela (Sikkim spot Judy)
Tribe: Nemeobiini
Genus: Zemeros Species: Zemeros flegyas (Punchinello) Subspecies: Zemeros flegyas flegyas (Himalayan Punchinello)
Family: Hesperiidae Subfamily: Hesperiinae Tribe: Aeromachini
Genus: Aeromachus Species: Aeromachus stigmata (veined scrub hopper) Source:
Genus: Ancistroides Species: Ancistroides nigrita (chocolate demon)
Genus: Pedesta Species: Pedesta pandita (brown bush bob)
Genus: Sebastonyma Species: Sebastonyma dolopia (tufted ace) Source:
Genus: Zographetus Species: Zographetus ogygia (purple-spotted flitter) Subspecies: Zographetus ogygia ogygia (continental purple-spotted flitter)
Tribe: Baorini
Genus: Pelopidas Species: Pelopidas assamensis (great swift)
Genus: Polytremis Species: Polytremis eltola (yellow-spot swift) Subspecies: Polytremis eltola eltola (Darjeeling yellow-spot swift)
Tribe: Taractrocerini
Genus: Telicota Species: Telicota bambusae (dark palm-dart)
Subfamily: Pyrginae Tribe: Tagiadini
Genus: Coladenia Species: Coladenia indrani (tricolor pied flat) Source:
Genus: Mooreana Species: Mooreana trichoneura (yellow flat) Source:
Genus: Tagiades Species: Tagiades menaka (spotted snow flat) Source:
Subspecies: Tagiades menaka menaka (Bengal spotted snow flat)
References
Butterflies of India India Biodiversity Portal Fauna of British India. Butterflies 1 by Talbot G Fauna of British India. Butterflies 2 by Talbot G.