on a tree seething with honey bees, other bees and at least six types of hoverfly -
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The rows of hairs down the eye, visible in the first picture, are unique to tenax.
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So when a hoverfly is described as having 'bare eyes', or face, this is a good contrasting example..?
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Eye hairs are sometimes very long and evenly distributed, sometimes really sparse and very hard to see (lens or microscope needed). This is the only species I know of where there are rows of longer hairs down the eye, though, which can be seen with the naked eye.
Lat/Lng: 51.5597, -0.0251
OS grid ref: TQ369863