UPDATE: 25 Nov 2019 First noted appearance of the year of a Mottled Umber, just a day later than in 2018. Didn’t reach the trap, roosted on the conservatory wall, was photographed and released into the front garden. The females are wingless, so these are definitely males. There are two LBAMs on the trap too, but nothing present by morning aside from a caddisfly and some diptera. My detailed mothing records for 2019 are available here.
This was the first new species to the actinic trap (night of 24th November 2018) for almost two weeks, having had numerous blanks and/or just the occasional Turnip Moth and a Dark Chestnut or two.
This species is the geometer moth Mottled Umber (Erannis defoliaria). The “geometers” all have larvae (caterpillars) that appear to measure the earth (they’re called inchworms colloquially in the US, I believe). Geo meaning earth, meter meaning to measure. More mothematics here.