Dear Gireesh Nadda,

40 views, no answers is a lot. In these cases, you'll have to rear the insects on their natural host plant (in the lab) to obtain adults. Almost all identifications are based on adults. Give them a clean and not-smelling-anything, transparent recipient, locate some filter paper on the bottom (to absorb humidity, and to put some drops of water (without chlorous compounds) to humidify the container, add the insect group as it is with the host plant parts they consume, and close the recipient with some dense tissue fixed wit rubber bands, so that they can't escape. Change the food as often as it dries or is consumed and annotate the instar changes if possible each day. Be aware of natural enemies (parasitoids) that may come out of their hosts. When pupae appear separate them, in a petri dish equally humidified regularly with filter paper and water, and wait for the adults to emerge. Then send the photos again. Good luck! Keep the larvae in a temperated room where natural light occurs, but not in direct sun light.

Here's a list of insects associated with myrtle:

http://researchtrend.net/tas21/1%20RAJESH.pdf

Good luck.