I have to admit to this being a little bit of a flier, in that it has not been confirmed by iNaturalist. However, Dennis Paulson’s book says of N. nathalia:
Propleuron pale. The showiest member of its genus, with extensive bright blue on thorax and with wide antehumeral stripe.
Once I had located the propleuron, my specimen here clearly has a pale one and the blue markings match. It seems that alternatives do not have the pale propleuron but a black one. There is another shadowdamsel with a pale propleuron [P. melanota] but it is known only from the type specimen. So, I’m going with P. nathalia until I’m proved wrong.
| male | |
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 male.jpg) |