In going through various examples of l. canescens I did come across a male from Trang which have the 4th spot split.
See below. https://yutaka.it-n.jp/lim2/722100010.html
This is of course a rarity & may be due to gene introgression ie crossing.
The antennal club is all black in L. canescens.
There are other supporting features for L. canescens.
The yellow spots form a ring near the apex & the spot in space 5 (3rd from the top) have its inner margin concave/crescentic.
The underside spots are yellow & UnH submarginal marks are sagittate.