The effects of larval competition on puparial size in Sarcophaga spp. (Diptera: Sarcophagidae) breeding in dead snails

An account is given of the effects of competition for food on the volume of the puparia of three species of Sarcophaga breeding in dead snails. The relationships between the number of puparia in a snail and the mean and total volume of the puparia, and the extent to which food is equally divided among the larvae are discussed.