B. Albopilosum
No, at this size the flap would be far smaller - roughly the bottom 10% of the area circled. I have illustrated on this photo of my 2.5" female - red is where you have circled and the blue is where the spermathecae and flap are.
That is why it is so difficult at the smaller sizes - what you're looking for at only 1.5" is very small.
 
@jrh3 Don't get discouraged. Once you see it a couple of times, and become more familiar with the different structures that different species have, it will become much easier for you to spot.
 

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Spermathecae sexing (Molts)
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jrh3
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Apple iPhone XR
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ƒ/1.8
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4.3 mm
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64
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040996FD-C14E-4461-A40A-634684A99AA9.jpeg
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Tue, 07 May 2019 3:37 PM
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