This is a male (see whistling structure in each forewing). First sighting of this interesting day-flying moth species on CNM. Male of the species has a unique wing structures which allows it to generate a whistling noise thought to attract females. Females don't have the whistling ability. Food plant recorded as the dodder laurel: Cassytha melanta (Devil's Twine). Has been recorded on Black Mountain previously (ANIC specimen, both sexes, wing fragments only, see images Bold Systems 4). Males of H. fenestrata are diurnal, flying a figure of eight pattern at dusk, whistling to attract females (Zborowski and Edwards 2007).