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HoBsoN [1935] showed that blowfly larvae required a fat-soluble growth factor which was contained in the unsaponifiable ether-soluble fraction of their food and proved to be identical with or replaceable by cholesterol. Subsequently the indispensability of cholesterol for the growth of many insects was demonstrated (Van t'Hoog [1936] for Dro8ophila; Chiu & McCay [1939] for the bean weevil Acanthoscelides obtectu; Fr6brich [1939] and Offhaus [1939] for the flour beetle Tribolium confusum; and for the edible snail, Helix pomatia, Howes [1937]). In a study of the nutritional requirements of the beetle Dermestes vulpinus, carried out in this department, Gay [1938] showed that growth of the larva was satisfactory on a diet consisting of casein, cystine, yeast, salt mixture and cholesterol, or of yeast, salts and cholesterol, while omission of cholesterol from either diet prevented growth. It has been the purpose of the present investigation to obtain more detailed information about the sterol requirements of this beetle.

The sterol requirements of the larva of the beetle, Dermestes vulpinus Fabr