Seasonal Variation in the Distribution of Two Species of Symphyla Found in California

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Abstract
The members of the class Symphyla are widely distributed throughout the world and have been encountered in population studies conducted by Morris (1922, 1927), Thompson (1924), Edwards (1929), Sawa (1930) and Williams (1931). The garden centipede, Scutigerella immaculata (Newp.), may occur in great numbers in many localities and has been reported as doing serious damage to growing crops in the United States, England, France, Portugal and the Hawaiian Islands. While working with this species in the delta region of the Sacramento River, the writer noted marked variations in populations. An investigation was therefore undertaken to determine the cause of these fluctuations.