Macronoctua onusta
In 3 days ~10% in a week ~20%
Macronoctua onusta, commonly known as the iris borer, is a species of cutworm or dart moth in the family Noctuidae. It is found in North America. Macronoctua onusta is a large brown and smoky dark gray moth (FW length 18–21 mm). It has a forewing that is broad with a scalloped outer margin and a black streak along the reniform spot. It is dull brown with broad smoky dark gray suffusion on the costa and in the cell as well as in the terminal area and fringe. The antemedial and postmedial lines are thin, dark gray. The antemedial line is drawn far lateral above the posterior margin. The median line is dark brown, strongly arched toward across the brown median area below the cell. The postmedial line is jaggedly zigzagged on the anterior wing and straight from Anterior cubitus vein to the posterior margin. The subterminal line is only evident as the transition from the brown subterminal area to the black terminal area. The terminal area is a black line. The three spots are outlined in thin black. The orbicular spot is a small oval. The reniform spot has a darker posterior outline which forms a straight black line below the cubital vein. It is large and asymmetrically... Wikipedia →
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Rare
Under 5% of wildlife watchers report an Iris Borer Moth sighting in Boston on a given day, based on 5 verified sightings from GBIF citizen-science data. It is the 1063rd most-seen of the 1200 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report an Iris Borer Moth in Boston on a given day, so our monthly data shows no clear season.
Among the best
Of the 3 cities where we can rate Iris Borer Moth sightings, Boston ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Toronto (Canada, under 5%).
Same family: Noctuidae
The closest relatives of the Iris Borer Moth that you can see in Boston (family Noctuidae, Cutworm Moths and Allies) are Large Yellow Underwing (about 10%), Armyworm Moth (about 10%) and American Copper Underwing (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Iris Borer Moth is recorded against all the insects logged in Boston (5 verified sightings), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
