Telostylinus angusticollis is a fly in the family Neriidae of the insect order Diptera. They are typically found on the east coast of Australia near rotting vegetation. Aggregating on the rotting bark of trees such as Acacia longigolia and other trees in New South Wales and southern Queensland. T. angusticollis flies found in the wild have accelerated speeds of development and age of mortality when compared to those in captivity.