Hastings' Dictionary of the Bible (1898)
SPI'DER, a well-known little creature of very singular structure and habits. The thinness and frailty of its web are made emblematic of a false hope and of the schemes of wicked men. Job 8:14; Isa 59:5. Another word thus rendered in Prov 30:28 has been thought by some of the best authorities to refer to the gecko, a kind of lizard which is able to run on perpendicular walls, or even on an inverted surface. See Ferret.
But so skilfully does the spider use her feet in making her web and climbing upon it and upon walls that they may well be termed hands, and thus our present translation is rendered very plausible. The spider's spinning-organs serve as both hands and eyes. Spiders are abundant in Palestine, as elsewhere in the world.