ID help needed

[itsmemei]

Dear Dr Seow, I shot this in Upper Seletar Reservoir. Could you kindly advise if it is Rapala suffusa or Rapala dieneces. Thanks in advance!https://c1.staticflickr.com/5/4236/34298790373_8161eeed41_b_d.jpg

[Psyche]

This is a sticking problem, trying to differentiate between the two based on the underside.
A female here.

All correct females of R. dieneces have the FW postdiscal band fairly straight.
http://wingscales.com/content/record/1741-1-cec76.jpg
https://farm6.staticflickr.com/5474/14002829059_93d92f210a_c.jpg
https://c1.staticflickr.com/3/2891/33486173603_638ecd103c_c.jpg
http://farm5.static.flickr.com/4059/4695540140_6e2b552527.jpg

All correct females of R. suffusa have the FW band arcuate or bent towards the costa (forward margin).
http://2.bp.blogspot.com/-66Xxi-yYPLc/Ux_ApPzQX9I/AAAAAAAALxM/g4QCADCzDrM/s1600/SuffusedFlash-SunnyC.png
http://farm4.static.flickr.com/3301/3474959465_126294c2e6.jpg
http://www.butterflycircle.com/checklist/mugshots/Rapala%20suffusa%20barthema/Rapala-suffusa-barthema-(-Suffused-Flash)-Femaile-...-Sunny-Chir.jpg

Based on these findings I would say it is Rapala dieneces.
Note R. suffusa is also a deeper yellow.

TL Seow: CHeers.

[itsmemei]

Thank you, Dr Seow and also for the detailed explanation!