Coenosia acuticornis has the apex of the antennae produced into a thorn-like tip. In both sexes the tibiae are entirely yellowish, the parafrontals and parafacialia (orbits next to the eyes above and in front) are grey dusted (similar to the face), and the thorax is marked widely between the dorsocentral row of bristles with a brownish vittae that extends posteriorly over the scutellum. Males are smaller at around 2.5-3.0 mm, with females 3.5-4.0mm. The only other described Australian Coenosia species that share a pointed antannae is C. latitarsis, which can be distinguished by the tibiae being only yellowish at the bases and the male with foretarsi somewhat flattened and wide (female has not been described) – males of C. acuticornis have unremarkable foretarsi.
Mid October 2011
Some prey of C. acuticornis. Prey family respectively: fungus gnat (Sciaridae); moth fly (Psychodidae); & winter cranefly (Trichoceridae).