Preliminary Experiments on the Silverfish Ctenolepisma urbani Slabaugh1

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Abstract
In a series of expts. conducted on this silverfish it was observed that it was repelled from commercial poison cards coated with a paste containing white arsenic; it feeds on materials of both animal and vegetable origin, wheat flour and beef extract being most attractive; it prefers papers of pure chemical pulp to those of mechanical pulp; it is completely repelled by flour pastes containing tartar emetic and Na arsenite, partially repelled by flour pastes containing white As, NaF, and Na fluosilicate, and does not detect Ba fluosilicate or Ba carbonate in a flour paste; it is much more rapidly susceptible to a dust of pyrethrum powder than it is to dusts of either NaF or Na fluosilicate; it prefers vegetable fibers to animal fibers; and it may be trapped in jars made by binding the outside surface of a 1 oz. salve jar clear to the rim with scotch masking tape, within which is a teaspoonful of flour.

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