Chequered Grass-veneer

Catoptria falsella

Catoptria falsella, the chequered grass-veneer, is a species of moth of the family Crambidae. Source

Where it is now

In the last 8 weeks this insect was recorded 35 times across 5 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 21°C (typically 19 to 25°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 50°N in August to 60°N in July, 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.