Summary
Adults of Simulium fulvinotum were found for the first in nature, and their breeding sites are described. Ovoposition behavior is described, and the prefered substrates for egg deposition are identified. S. fulvinotum has 8 larval Instars, a number found previously in only one other simuliid, as was determined by the measurement of the postgena and cephalic apotome of 548 larvae. The daily high temperature peak appers to be a stimulus for the initiation of egg-laying. The time of day and duration of oviposition were recorded at natural breeding sites. The incubation period of eggs was determined by laboratory rearing. S. fulvinotum is proposed as a model species for the study of the ecology, biology, and behavior of Amazonian Simulium.