Prosotas aluta

Race coelestis: Male upperside: shining bluish with a purple flush in certain lights. Forewings and hindwings: termen narrowly edged with fuscous black on which the jet-black anteciliary line on each wing is obscurely visible, the edging of fuscous black slightly widened anteriorly. Underside: dusky brown. Forewing: a transverse, subbasal, broad, dark, brownish-black, white-margined band from the subcostal to vein 1, a similar band along the discocellulars also extended to vein 1, an upper discal similar band from costa, curved a little outwards and stopping short at vein 3, followed by a postdiscal transverse series of dark spots which on the inner side are comparatively broadly, on the outer side very slenderly edged with white; succeeding which is a subterminal extremely slender series of transversely linear spots, a white line and a jet-black anteciliary line; cilia brown. Hindwing: three transversely arranged dark brownish-black spots; transverse similarly coloured subbasal and discal bands, both bands inwardly and outwardly edged with slender white lines and the discal band greatly and irregularly widened in the middle, where superposed on the dark background is a snow-white transverse spot; beyond these are a postdiscal series of comparatively broad white lunules, a subterminal very slender white lunular line, a terminal white thread and a jet-black slender anteciliary line; cilia shining silky brown; tail brown tipped with white. Antennae black, the shafts obscurely speckled with white; head black; thorax and abdomen bluish; beneath: palpi with blackish fringe, thorax and abdomen whitish.[3]

The butterfly occurs in India from Kumaon to Assam and onto Myanmar. It is also found in the Andamans. In Southeast Asia the butterfly ranges from Myanmar to southern Yunnan and southwards to Peninsular Malaysia, Borneo, Sumatra, Nias, northern Sulawesi, the Philippines, Thailand, Singapore, Vietnam, China, Nepal, Bhutan and Bangladesh.[2]

• List of butterflies of India (Lycaenidae)

• Dey, R., I.K.A. Haidar, S. Rudra & M.R. Islam (2020). First record of Banded Lineblue Prosotas aluta Druce, 1873 (Insecta: Lepidoptera: Lycaenidae) from Bangladesh. Journal of Threatened Taxa 12(4): 15507–15509. https://doi.org/10.11609/jott.4849.12.4.15507-15509/
• Evans, W. H. (1932). The Identification of Indian Butterflies (2nd ed.). Mumbai, India: Bombay Natural History Society.
• Gaonkar, Harish (1996). Butterflies of the Western Ghats, India (including Sri Lanka) – A Biodiversity Assessment of a Threatened Mountain System. Bangalore, India: Centre for Ecological Sciences.
• Haribal, Meena (1992). The Butterflies of Sikkim Himalaya and Their Natural History. Gangtok, Sikkim, India: Sikkim Nature Conservation Foundation.
• Kunte, Krushnamegh (2000). Butterflies of Peninsular India. India, A Lifescape. Hyderabad, India: Universities Press. ISBN 978-8173713545.
• Wynter-Blyth, Mark Alexander (1957). Butterflies of the Indian Region. Bombay, India: Bombay Natural History Society. ISBN 978-8170192329.

• Takanami, Yusuke & Seki, Yasuo (2001). "Genus Prosotas". A Synonymic List of Lycaenidae from the Philippines. Archived from the original on 8 September 2001 – via Internet Archive. With images.