Notes on oviposition and embryonic development of Enallagma ebrium (Hagen) and E. vernale Gloyd in Quebec (Zygoptera: Coenagrionidae)

Captured individuals mated and oviposited in the laboratory. Eggs were placed under constant temperature conditions. In the 2 spp. the egg development is influenced by temperature, and it is best described by the sigmoid curve. The lower threshold of development is provided for each sp. along with day-degrees necessary to reach hatching.