| Abstrakt: |
Simulium pictipes Hagen occurs in much of the eastern United States (Stone, 1964, Diptera of Connecticut. Simuliidae and Thaumaleidae, Conn. St. Geol. and Nat. Hist. Survey Bull. No. 97). The larvae of the species commonly attach to bedrock in swift-flowing streams, particularly below waterfalls. They congregate in mosslike patches which may contain 50 individuals per cm2. According to several authors there are several summer generations and overwintering is in the larval stage (Smart, 1934, Can. Ent. 66: 62–65; Stone, 1964, op. cit.; Stone & Jamnback, 1955, The black flies of New York State, N.Y. State Mus. Bull. No. 349). Davies & Peterson (1956, Can. J. Zool. 34: 615–55) observed eggs of S. pictipes in a stream in October, indicating that overwintering might occur in the egg stage. |
