Dark Arches

Apamea monoglypha

Apamea monoglypha, the dark arches, is a moth of the family Noctuidae. The species was first described by Johann Siegfried Hufnagel in 1766. It is a common, sometimes abundant, European species. It is found in most of Europe except northernmost Fennoscandia and the southern parts of the Iberian Peninsula and Greece. The species is also found in Anatolia, Turkestan, Western Asia and Central Asia, Siberia and Mongolia. In the Alps it is found up to heights of 2,500 meters. The smaller subspecies sardoa is found on Sardinia and Corsica. Source

Where it is now

In the last 8 weeks this insect was recorded 50 times across 4 areas (each area is a 5 degree square).

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Movement and weather

Each season it is first heard regularly where daytime highs are around 17°C (typically 16 to 19°C, from 6 areas). That holds across 20° of latitude, which suggests its timing follows temperature more than the calendar.

Over the weeks it was present in the past year, its centre in Europe ranged from 52°N in June to 63°N in August, about 1,200 km apart.

Arrival dates

The week it was first heard regularly in each region, after at least six weeks away. Dates differ from south to north, so a region has a range.

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Figures are effort corrected and come from automatic sound identification, which makes mistakes. How this is measured and how it compares with human observers.