Length: typically 15 - 17 mm
Primary range: British Columbia to Ontario and Vermont, south to California and east to North Carolina.
In most areas sightings of the adults are most numerous in September and October. Females oviposit into the pithy central column of plants such as blackberry and raspberry.
As the English and Latin species names suggest, the antennae in this species are dark. On the basal two segments, look for two dark marks against a yellowish background on each.
Photo data: 27 August 2004, Ohio River Islands National Wildlife Refuge, Pleasants County, West Virginia.