The Double-spotted Line Blue (Nacaduba biocellata) is a butterfly

Butterfly

A butterfly is a mainly day-flying insect of the order Lepidoptera, which includes the butterflies and moths. Like other holometabolous insects, the butterfly's life cycle consists of four parts: egg, larva, pupa and adult. Most species are diurnal. Butterflies have large, often brightly coloured...

 of the Lycaenidae

Lycaenidae

The Lycaenidae are the second-largest family of butterflies, with about 6000 species worldwide, whose members are also called gossamer-winged butterflies...

 family. It is found in Australia

Australia

Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

 (including New South Wales

New South Wales

New South Wales is a state of :Australia, located in the east of the country. It is bordered by Queensland, Victoria and South Australia to the north, south and west respectively. To the east, the state is bordered by the Tasman Sea, which forms part of the Pacific Ocean. New South Wales...

, the Northern Territory

Northern Territory

The Northern Territory is a federal territory of Australia, occupying much of the centre of the mainland continent, as well as the central northern regions...

, South Australia

South Australia

South Australia is a state of Australia in the southern central part of the country. It covers some of the most arid parts of the continent; with a total land area of , it is the fourth largest of Australia's six states and two territories.South Australia shares borders with all of the mainland...

, Victoria

Victoria (Australia)

Victoria is the second most populous state in Australia. Geographically the smallest mainland state, Victoria is bordered by New South Wales, South Australia, and Tasmania on Boundary Islet to the north, west and south respectively....

 and Western Australia

Western Australia

Western Australia is a state of Australia, occupying the entire western third of the Australian continent. It is bounded by the Indian Ocean to the north and west, the Great Australian Bight and Indian Ocean to the south, the Northern Territory to the north-east and South Australia to the south-east...

), Singapore

Singapore

Singapore , officially the Republic of Singapore, is a Southeast Asian city-state off the southern tip of the Malay Peninsula, north of the equator. An island country made up of 63 islands, it is separated from Malaysia by the Straits of Johor to its north and from Indonesia's Riau Islands by the...

, the New Hebrides

New Hebrides

New Hebrides was the colonial name for an island group in the South Pacific that now forms the nation of Vanuatu. The New Hebrides were colonized by both the British and French in the 18th century shortly after Captain James Cook visited the islands...

, Sumba

Sumba

Sumba is an island in eastern Indonesia, is one of the Lesser Sunda Islands, and is in the province of East Nusa Tenggara. Sumba has an area of 11,153 km², and the population was officially at 611,422 in 2005...

 and Bali

Bali

Bali is an Indonesian island located in the westernmost end of the Lesser Sunda Islands, lying between Java to the west and Lombok to the east...

.
The wingspan

Wingspan

The wingspan of an airplane or a bird, is the distance from one wingtip to the other wingtip. For example, the Boeing 777 has a wingspan of about ; and a Wandering Albatross caught in 1965 had a wingspan of , the official record for a living bird.The term wingspan, more technically extent, is...

 is about 20 mm. Adult females have a brown upperside, while the males are blue with narrow black margins. The underside of both sexes is pale brown with light and dark wavy lines.

The larvae feed on the shoots, flowers and buds of various Acacia

Acacia

Acacia is a genus of shrubs and trees belonging to the subfamily Mimosoideae of the family Fabaceae, first described in Africa by the Swedish botanist Carl Linnaeus in 1773. Many non-Australian species tend to be thorny, whereas the majority of Australian acacias are not...

species, including Acacia aneura, Acacia betchei, Acacia brachybotrya, Acacia deanei

Acacia deanei

Acacia deanei is a tree native to Australia, which is used for controlling erosion on. There are two subspecies: Acacia deanei subsp. deanei and Acacia deanei subsp. paucijuga.-External links:**...

, Acacia erinaceae, Acacia irrorata, Acacia karroo

Acacia karroo

Acacia karroo also known as the Sweet Thorn, is a species of Acacia, native to southern Africa from southern Angola east to Mozambique, and south to South Africa....

, Acacia ligulata, Acacia osswaldii, Acacia penninervis

Acacia penninervis

Acacia penninervis is a perennial shrub or tree 2-8m high, which is native to Australia and New Zealand.Common names for it are Hickory Wattle and Mountain Hickory....

, Acacia rigens

Acacia rigens

Acacia rigens, commonly known as Nealie, is an erect or speading shrub or small tree that is endemic to Australia. Other common names include Needle Wattle, Needlebush Acacia, Nealia and Nilyah....

, Acacia salicina

Acacia salicina

Acacia salicina is a thornless species of Acacia tree native to Australia.Common names include Cooba, Native Willow, Willow Wattle, Broughton Willow,Sally Wattle and Black Wattle....

, Acacia sclerophylla, Acacia sowdenii and Acacia victoriae

Acacia victoriae

Acacia victoriae commonly known as Gundabluie or Bardi bush is a shrub or tree native to Australia. It grows 2–5 m, sometimes 9 m tall. It has spines 2–12 mm in length.Subspecies:A. victoriae subsp. arida Pedley-Uses:...

. They can have a wide range of colours depending on their host plant, including pink, orange, yellow or green. Their colour appears to depend on the nature of the and buds on which they are feeding. They are attended by ants, mostly Iridomyrmex

Iridomyrmex

Iridomyrmex is a genus of ants that belongs to the subfamily Dolichoderinae. There are 79 species and subspecies that belong to this genus and they range from India to China to Australia and New Caledonia.-Description:...

species, including Iridomyrmex purpureus and Iridomyrmex viridiaeneus.

Pupation takes place in a pale brown pupa, which is formed in debris on the ground under the food plant.

Subspecies

• Nacaduba biocellata biocellata (Australia)
• Nacaduba biocellata armillata (Butler, [1876]) (New Hebrides, Sumba)
• Nacaduba biocellata baliensis Tite, 1963 (Bali)