Abstract
A Warburg apparatus was used to determine the cubic millimeters of oxygen consumed per hour by second- and third-instar common cattle grubs (Hypoderma lineatum (De Vill.)) and northern cattle grubs (H. bovis (L.)) extracted from backs of cattle. With second-instar larvae, oxygen consumption increased in a linear fashion with an increase in weight; with third instars, it increased until middle weights were reached, and decreased as larvae approached the pupal stage. In general, oxygen consumption of H. bovis was greater than that of H. lineatum larvae of similar weight. There apparently is a large increase in metabolic processes associated with molt from second- to third-instar larvae. Data on weights of larvae are also presented.
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