Slaty Skimmer

Libellula incesta

Libellula incesta, the slaty skimmer, is a dragonfly of the skimmer family, native to eastern United States and southern Ontario, Quebec, and New Brunswick. Adults are 5.28 cm (2.08 in) long. Mature males are dark blue with black heads. Females and juveniles have brown abdomens with a darker stripe down their backs. Adults fly from June to August. Larvae are habitat specialists, found in the benthos of permanent lakes. Source

Where it is now

In the last 8 weeks this insect was recorded 15 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 28°N in August to 41°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.