Gram Blue (Euchysops cnejus)

An uncommon butterfly found in intermediate and dry zones of the Sri Lanka. However it is more plentiful in the north of the island. According to the Woodhouse it is to be found, chiefly in February, March and May in the dry zone, particularly the north of the island (Woodhouse LG.O., 1950). Ormiston noted that it is frequently a serious pest to the gram crops in South India (Ormiston W.,  1924). Hence its vernacular name. However according to the de’Abrera it has yet to prove so in Sri Lanka (de’Abrera B., 1998 ). Gram Blue is subject to considerable seasonal variation in size and the intensity of blue on its wings.  Its larva attended by ants and feeds on various plants of the family Fabaceae such as Macroptilium lathyroides (Wild bushbean), Neustanthus phaseoloides, Vigna marina, Vigna trilobata, Vigna unguiculata (මෑ කරල්/ ලී මෑ/වඳුරු මෑ/Black-eye Bean/Cowpea), Vigna radiata (මුං/මුං ඇට/බූ මෑ/Green gram/Jerusalem pea/Mung bean), Vigna mungo (බූ මෑ/මුං/උළුඳු/Black gram), Abrus precatorius (ඔළිඳ/Crab's Eyes/Indian Liquorice) and Canavalia rosea.