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I see that Collin 1943 mentions Tephrochlamys rufiventris var canescens, keying it as 'Thorax lighter grey, but 3rd antennal joint blacker.' He then says 'there appears to be a difference, in this variety, from the typical form in the greater number of bristles on the tergal shell of the hypopygium. Small specimens may have only four rows of acrostichal microchetae.' That would seem to fit with this one...so is it just variety within rufiventris maybe?