GR translation: a beige summer spook at her roadside

[Mike Jing]

V472.3-9    Of course Slothrop lost her, and kept losing her—it was an
American requirement—out the windows of the Greyhound, passing into beveled
stonery, green and elm-folded on into a failure of perception, or, in a
more sinister sense, of will (you used to know what these words mean), she
has moved on, untroubled, too much Theirs, no chance of a beige summer
spook at her roadside. . . .

What is this "beige summer spook"?
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