Twenty-spotted Lady Beetle

Psyllobora vigintimaculata

Psyllobora vigintimaculata, the twenty-spotted lady beetle, is a species of lady beetle in the family Coccinellidae. It is found in North America, where it has been recorded from Newfoundland to Alaska in the north and from Virginia to Tennessee and Louisiana, west to southern California. Source

Where it is now

In the last 8 weeks this insect was recorded 14 times across 3 areas (each area is a 5 degree square).

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Movement and weather

Over the weeks it was present in the past year, its centre in North America ranged from 36°N in April to 47°N in May, 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.