A question about an old specimen of crab spider

In one of van Hasselt’s publication on Midden-Sumatra he states (in dutch, on platythomisus spiders) “The number of spots within the same species can vary, primarily due to coalescence; for instance, I possess a Javanese specimen of a true octomaculatus with only five spots, as the four uppermost ones have run together or fused into one.” Does anybody know what this specimen looks like or where it is stored?

It’s probably in a European museum, like Germany or The Netherlands.

Thanks.

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