Synonyms for Blackfly (same or very similar meaning)
WordNet sense 1 (blackish aphid that infests e.g. beans and sugar beets):
Aphis fabae, bean aphidWordNet sense 2 (small blackish stout-bodied biting fly having aquatic larvae; sucks the blood of birds as well as humans and other mammals):
buffalo gnatFrom the ODE community, based on WordNetadd/edit