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I don't think the angle of the yellow spots is particularly any different between the species, is it? Looking at some specimens, I can't see much difference, anyway. The dust spots on the frons look like scalare, but I'm a little wary of that since noticing that mellinum females appear to show broad dust spots from certain angles, even though they are actually only small.
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Its difficult to quantify size of dust spots in the field Ian , melanostoma we know that for sure but likely scalare as a possibility Perhaps the adding of an other image if available ? More shots like below would be great
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THere is no case for using the shape of the abdominal spots (at least at the moment but wait 'till Alan splits both scalare and mellinum - it is on the cards!).
Using current systems my view is that this is M. scalare based on the frons dust spots.
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