Cloudless Sulphur

Phoebis sennae

Phoebis sennae, the cloudless sulphur, is a mid-sized butterfly in the family Pieridae found in the Americas. There are several similar species such as the clouded sulphur, the yellow angled-sulphur, which has angled wings, the statira sulphur, and other sulphurs, which are much smaller. The species name comes from the genus Senna to which many of the larval host plants belong. Source

Where it is now

In the last 8 weeks this insect was recorded 99 times across 8 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 23°N in December to 37°N in August, about 1,600 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.