T. linna & bambusae are very difficult to separate & it seems there no clear feature to ID them except by size.
T. linna is large (FW 18mm.)
male Telicota bambusae is right.
The grey male brand is straight in the black space, with black on either side of it.
Base of space
Before he erected the name M. cresta in 1949, Evans had in his earlier works described this species under the name M. druna