What counts as "form alba"?

[Jeff Cagle]

The difficulty in sorting white female Orange Sulphur and white female Clouded Sulphur is well-known.  But here's a second puzzle: How much yellow/cream can a white female have and still be form alba?

For example: https://www.inaturalist.org/observations/308325384

With sunlight shining through, it is clear that the subapical area and entire hindwing are cream or light yellow, while the forewing is white.  Alba, or pale Clouded Sulphur?  

Jeff

[Rick Borchelt]

This to me is a clear alba.  Clouded will have buttery yellow, not cream.  The closeup should be discounted because the light shining through obscures the ground color.  

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Rick Borchelt
College Park, MD
preferred personal email:  rborchelt |AT| gmail |DOT| com

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