♂, Chanthaburi, Thailand.		♀, Chanthaburi, Thailand.
♂, Ranong, Thailand.		♀, Ranong, Thailand.
♂, Yala, Thailand.		♀, Satun, Thailand.

ON : Papilio radamanthus Fabricius, 1793 OD : Ent. Syst. 3(1):42. TL : 'Asia' [? Siam ; Malaya]. Distribution : Myanmar, Thailand, Laos, Cambodia, Vietnam, Yunnan, Langkawi, W.Malaysia, Singapore, Sumatra.

Papilio diocletianus Fabricius, 1793 : Ent. Syst. 3(1):40. TL. India orientali. (Homonym)
Euploea diocletianus diocletianus f. despoliata Fruhstorfer, 1910 : in Seitz, Grossschmett Erde 9:271. TL. Siam.

[ THAILAND ]
Euploea diocletianus diocletianus ; Fruhstorfer,1910 : 271. (Siam)
Euploea diocletianus diocletianus ; Godfrey,1916 : 121. (Chonburi: Sriracha)
Euploea diocletianus diocletianus ; Pendlebury,1923 : 32. (Nakhon Sri Thammarat: Tai Sai River; Wat Kiriwong; Khao Luang)
Euploea diocletianus diocletianus ; Godfrey,1927 : 121. (N)
Euploea diocletianus diocletianus ; Godfrey,1930 : 242. (all over)
Euploea diocletianus diocletianus ; Godfrey,1932a : 266. (P)
Euploea diocletianus diocletianus ; Pinratana,1977 : 91, figs.D36,♂,♀. (all over)
Euploea radamanthus radamanthus ; Pinratana & Eliot,1992 : 70,74, pl.92, figs.35,♂,♀. (Nakhon Nayok; Ranong; Trang)
Euploea radamanthus radamanthus ; Yamaguchi, Aoki & Akiyama,2005 : 48, fig.12,♂. (Ubon Ratchathani: Phu Chong Na Yoi)
Euploea radamanthus radamanthus ; RDPB & DNP,2006-2008 : Butterflies in Hala-Bala Forest, fig.[♂]. (Narathiwat: Hala Bala) (last update: 2006.12.25 ; accessed: 2024.04.30)
Euploea radamanthus radamanthus ; Ek-Amnuay,[2007] : 216, pl.81, figs.D35,♂,♂,♀,♀(Un). ('Wiang Pa Pao'; Chanthaburi)
Euploea radamanthus radamanthus ; Les Day,2011-2022 : Samui Butterflies, figs.♂,♂(Un). (Koh Phangan) (accessed: 2023.03.24)
Euploea radamanthus radamanthus ; Ek-Amnuay,2012 : 216, pl.81, figs.N36,♂,♂(Un),♀,♀(Un). ('Wiang Pa Pao'; Chanthaburi)
Euploea radamanthus radamanthus ; S.Sophonviwatkul, C.Sunthornwiphat & T.Laola,2015- : Butterflies of Thailand, figs. (Sa Kaeo; Nakhon Ratchasima; Nakhon Nayok; Trat; Phetchaburi) (accessed: 2024.07.04)
Euploea radamanthus radamanthus ; Kimura et al.,2016 : 42, figs.♂,♂(Un),♂,♂(Un),♂,♂(Un),♂,♂(Un),♀,♀(Un),♀,♀(Un). (Toon Slang Luang; Phu Khiewo; Khao Yai; Nakohn Nayork; Kao Yai; Kao Soi Dao; Kao Khiewo; Khlong Naka; Ka Chong; Nam Tok Bolipat)
Euploea radamanthus radamanthus ; Küppers & Janikorn,2017 : 239, figs.Abb.Da-151-154. (Phang Nga)
Euploea radamanthus radamanthus ; Chaianunporn & Chaianunporn,2019 : 86. (Chaiyaphum: Chulabhorn Dam)

[ LAOS ]
Euploea diocletianus diocletianus ; Motono & Negishi,1989 : 53, col.pl.12 ; pl.39, figs.5,♂,6,♂(Un),7,♀,8,♀(Un). (Vang Vieng; Phatong; Vientiane; Nam Moh; Tha Ngone; Pakse; Tha Lat; Nam Ngum Dam)
Euploea radamanthus radamanthus ; Osada, Uémura & Uehara,1999 : 204, pl.45, figs.♂,♀. (Thabok; Vang Vieng)
Euploea radamanthus radamanthus ; Onodera,2009b : 39. (Bolikhamxai: Thabok)
Euploea radamanthus radamanthus ; Nakamura & Wakahara,2012 : 43.
Euploea radamanthus radamanthus ; Onodera,2022 : 25, pl.87, figs.♂,♂(Un),♀,♀(Un). (Bolikhamxai: Thabok; Khammouan: 'Lak Sao' [Lak Kao])

[ CAMBODIA ]
Euploea despoliata ; Vitalis,1919 : 222. (Cambodge)
Euploea radamanthus radamanthus ; Woodfield & Murton,2006 : figs.♂,♂(Un). (Botum Sakor NP.)
Euploea radamanthus ; Onodera,2008 : 60, 59,figs.♂,♂(Un). (Mondolkiri: Romonea)
Euploea radamanthus radamanthus ; Monastyrskii et al.,2011 : 128. (Phnom Samkos W.S.)
Euploea radamanthus radamanthus ; Kosterin,2019 : 95. (Koh Kong)
Euploea radamanthus radamanthus ; Kosterin,2019b : 30. (Ratanakiri)
Euploea radamanthus radamanthus ; Chartier & Kosterin,2022 : 115. (Koh Kong; Mondulkiri; Pursat; Ratanakiri)

[ VIETNAM ]
Euploea diocletianus diocletianus ; Fruhstorfer,1910 : 271. (Annam)
Euploea despoliata ; Vitalis,1919 : 222. (Annam / Cochinchine)
Euploea diocletianus diocletianus ; Metaye,1957 : 102. (N / C / S)
Euploea diocletianus diocletianus f.despoliata ; Metaye,1957 : 102. (C)
Euploea diocletianus diocletianus ; Metaye,1958a : 168, pl.3, figs.8,♂,9,♀. (all over)
Euploea diocletianus diocletianus f.despoliata ; Metaye,1958a : 168. (C)
Euploea diocletianus diocletianus ; Morishita,1970 : 70, figs.29,♂♀. (Dinh Quan; Trang Bom; Banmethuot; Col de Blao)
Euploea diocletianus diocletianus ; Morishita,1977 : 51. (Vietnam)
Euploea radamanthus ; Vu,2003 : 56. (Phu Quoc)
Euploea radamanthus radamanthus ; Luong et al.,2004 : 3, 42, figs.♂,♂(Un). (Cuc Phuong)
Euploea radamanthus radamanthus ; Miyazaki, Saito & Saito,2006 : 15, figs.D-15,♂♀. (Lam Dong: Dambri)
Euploea radamanthus radamanthus ; Nihira,2009 : 98. (Phu Quoc)
Euploea radamanthus radamanthus ; Monastyrskii,2011 : 70-71, pl.13, figs.2a♂,2b♀. (N: Cuc Phuong / C: Xuan Lien; Ben En; Pu Hoat; Pu Mat; Vu Quang; Huong Son; Phong Nha-Ke Bang; Dak Rong; A Luoi; Huong Thuy; Nam Dong; Bach Ma; Son Thanh; Ngock Linh; Kon Ka Kinh; Hon Ba; Chu Yang Sin; Da Teh; Bao Lam; Loc Bac; Yok Don / S: La Nga; Nghia Trung; Cat Tien; Lo Go Sa Mat; Phu Quoc)
Euploea radamanthus radamanthus ; Yokochi et al.,2015 : 39. (Khanh Hoa: Hon Ba)
Euploea radamanthus radamanthus ; Monastyrskii & Devyatkin,2015 : 20. (C / S)

[ THAILAND ]
Nan : 2♂.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Nongkhai : 2♂.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Phetchabun : 4♂ (incl. photo).

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Chaiyaphum : 3♂ (incl. photo).

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Chonburi : 1♀.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Chanthaburi : 5♂ 3♀.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Trat : 2♂.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Ranong : 7♂ 4♀.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Phuket : 1♂.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Nakhon Si Thammarat : 1♂.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Trang : 1♀.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Satun : 1♂ 1♀.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Pattani : 1♂.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Yala : 4♂ (incl. photo).

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

[ LAOS ]
Vientiane : 2♂.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Champasak : 1♂.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

[ VIETNAM ]
Lam Dong : 1♂ 2♀.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

The butterfly is locally common in montane forests at low to moderate elevations (Alt. 30 - 1000m). Both sexes visit flowers and males occasionally come to the banks of streams and puddles to suck water.
Regarding the type locality of this species, Corbet,1941 assumed it to be in [Siam or Malaya] and Ackery & Vane-Wright,1984 stated it to be in [Canton, China]. However, records from China have only been found in Yunnan, and as far as I know, none have been found in Guangdong. It is therefore more likely to be Siam or Malaya as in Corbet,1941 and is tentatively treated as such here.

Fabricius, J.C.,1793 : Entomologia systematica emedata et aucta. secundum classes, ordines, genera, species, adjectis synonymis, locis, observationibus, descriptionibus.
3(1): [iv] + 488 pp. Copenhagen. C.G.Proft.

Fruhstorfer, H.,1910 : 3. Familie: Danaidae in Seitz, Gross-Schmett. Erde 9
265-272. (17.Dec.1910)

Corbet, A.S.,1941 : Observations on Certain of the Fabrician Names of Indo-Australian Rhopalocera (Lepid.)
Proc. R. ent. Soc. Lond. (B)10(6):98-106.

Morishita, K.,1977 : The genus Euploea in the Orient (Lepidoptera: Danaidae).
Acta Rhopalocerologica (2):1-60, 35 pls., Fukuoka. (in Japanese)

Ackery, P.R. & Vane-Wright, R.I.,1984 : Milkweed Butterflies, Their Cladistics and Biology :
Being an Account of the Natural History of the Danainae, a Subfamily of the Lepidoptera, Nymphalidae
British Museum (Natural History) ; Comstock Pub. Associates [London], Ithaca, N.Y. 425 pp.

♂, Phetchabun, Thailand.	♀, Yala, Thailand.
♂, Yala, Thailand.

1998.11.15 - 2024.07.31.