Eggs of Floodwater Mosquitoes XII. Installment Hatching of Aedes vexans (Diptera: Culicidae)1

Eggs of Aedes vexans (Meigen) obtained from mosquitoes reared and conditioned under controlled conditions will hatch in toto when subjected to a terminal hatching stimulus of reduced oxygen. However, eggs in the field, or when brought to the laboratory from the field, will not respond equally to this hatching stimulus. It was the objective of this investigation to demonstrate that sequential temperatures, location of the eggs, and circadian regimens of light during the antecedent generation could result in erratic or installment hatching.