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Tirumala septentrionis, commonly known as the dark blue tiger, is a species of butterfly in the danaid subfamily of the family Nymphalidae. It is found in South and Southeast Asia, including the Himalayas to southern India and Sri Lanka, Myanmar and Cambodia. Its upper wing is generally black with some bluish-white semihyaline markings, and its wing span is 80 to 115 millimetres (3.1 to 4.5 inches). This male butterfly of the subspecies T. s. dravidarum was photographed in Kumarakom in the Indian state of Kerala.Photograph credit: Charles J. Sharp