Seeing Sarah's earlier report of December Moths, I thought it would be interesting to look at the county records for this species. Below is the graph of number of records per year from 1966 to 2015:
The graph clearly shows the introduction of Ian's RIS trap in 1976, at which the numbers have declined a little in the past 40 years. It also shows the increased interest in year-round moth recording when the moth group was formed in 2009. Prior to that we had numbers of lepidopterists visiting Ceredigion, but mostly in the warmer months and hence few records for December moth.