Rare endemic butterfly found in wet zone forests up to elevation of about 3500ft. As per Woodhouse "it can be taken in numbers at the right time-April and July to September..." (Woodhouse L.G.O.,1950). d'Abrera also noted that it has only been sighted at certain times of the year from April sporadically to September (d' Abrera Bernard, 1998). Above specimen was photographed at Ingiriya forest reserve (Dombagaskandha) in mid February. Its larval host plants are Ventilago madraspatana (යකඩ වැල් ) and Ventilago gamblei.
Is the brick red patch on forewing that's present in Common Grass Yellow and Three-spot Grass Yellow also present in One-spot Grass Yellow in seasonal variations?
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