I've been looking at many of the specimens collected over the past 20 years from Singapore, and have yet to find two species that were present in the checklists of the early authors -
E. lacteola and
E. ada.
Two come close to
E. lacteola but when I had a comparison of the upperside, which also has some ID features in C&P4's key, they turned out to be more likely
E. hecabe than
E. lacteola.
As Seow said, then there are aberrants where the cell spots are obscured, or missing (our earlier debates about the regular appearances of "no-spot grass yellows" refer)
Hence unless we have a shot of a pristine specimen and a voucher one that can validate the physical characteristics, I would hesitate to nail down an ID with full confidence. With these
Eurema, there seems to be a wide variation of spots and markings.
Teo TP, on the other hand, may have more conclusive evidence of the presence of
E. lacteola with more specimens from the Singapore front to compare. Perhaps he can chip in on this discussion when he returns from his trip to Malaysia.