Abstract
Normal larvae of two beetles,
Lasioderma serricorne
and
Sitodrepa panicea
, and larvae freed from their intracellular symbionts have been grown on various diets. On white flour, a food deficient in vitamins of the B group, normal larvae grow very much better than sterilized larvae, while no such difference in the growth rate occurs on a diet rich in vitamins of the B group, e. g. wholemeal flour plus yeast. On an artificial diet which contains the vitamins of the B complex in pure substances, the normal
Lasioderma
larva grows well or fairly well in the absence of either thiamin, riboflavin, nicotinic acid, pyridoxin or pantothenic acid, and the normal
Sitodrepa
larva in the absence of any of these vitamins except thiamin. The sterilized larvae of both species fail to grow in the absence of any of these five vitamins. It is concluded that the intracellular symbionts of
Lasioderma
and
Sitodrepa
supply vitamins of the B group.
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