Straw Underwing

Thalpophila matura

The straw underwing is a species of moth in the family Noctuidae. The species was first described by Johann Siegfried Hufnagel in 1766. It is found from North Africa west through South Europe and Central Europe. In the north it is in parts of Ireland, Scotland, Sweden, Norway, Finland and Estonia. Further east the range stretches from southern Russia and Asia minor to the Caucasus. Source

Where it is now

In the last 8 weeks this insect was recorded 167 times across 8 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 27°C (typically 19 to 31°C, from 6 areas). That range is wide, so temperature alone does not explain when it turns up.

Over the weeks it was present in the past year, its centre in Europe ranged from 43°N in September to 56°N in July, about 1,400 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.