SeasonalityAdult specimens have been collected from late April to mid-May, with one apparently collected in late February.
Identification16-22 mm long, 40-50 mm wingspan. Anterior half of wings dark brown and opaque, posterior half transparent. Hair exceptionally dense with orange tint.
Characteristics shared with other Bombylius species include a slender first antennal segment, long scattered bristly hairs, holoptic males, conspicuously bristled hind femora, and a distinct intercalary vein (Hull 1973).