The first individual was trapped on St Agnes in mid-September 1958 with the next also there on 7th September 1959. See the graphs for the following individuals.
There are just 13 spring records, eleven in May and two in June. However, autumn is its main arrival time with 83 individuals in August, 193 during September, falling to 138 during October then just three occurrences in November. A total of 435 by the end of 2024.