Common blue bottle:
The common blue bottle (Graphium Sarpedon) is a black winged butterfly with a wing span of 80-90mm. There is a bottle shaped blue mark on its wings which disappears when folding it. The hind wings also have such blue marks crescent shaped.
The Lime butterfly (papilio demoleus) is black winged with a wingspan of 80-100mm. There seems many yellow/white spots on its wings and a red spot on its upper hind wing. Its host plant is citrus species like lime as its name shows. It is also seen in our gardens.