Which of the following species is NOT considered a pest black fly?

Simulium argus is the species that is not typically classified as a pest black fly. This distinction is important because certain species within the Simulium genus are significant pests due to their biting behavior, which can impact humans and livestock by causing irritation and discomfort.

Simulium luggeri, Simulium meridionale, and Simulium johansenni are all recognized for their potential to infest areas and bother people and animals, making them notable pest species. In contrast, Simulium argus has not been reported to have the same level of pest status or impact. Therefore, recognizing the different species within this genus and their implications for pest management is crucial for pest control and public health strategies.