There are two old records, from Kent (1817) and Devon (probably 1824 or 1826). A third record from Sussex (ca 1880) was shown to be erroneous. Benson (1951) concluded the species was 'very doubtfully British' but the circumstances around the Kent and Devon records seem sufficiently convincing that the species should be given the benefit of the doubt, albeit now long Regionally Extinct in Britain.

No records since the early 19th century, when three specimens were said to have been taken in the vicinity of London. These include the type specimen. Liston & Prous (2014) investigated this record and felt that the evidence supported the fact that it had indeed been taken in London. On balance, the evidence currently suggests it was once present but is now Regionally Extinct in Britain. However, the lack of subsequent British records could be, in part, because Benson (1951) did not include the species in his keys; could examination of specimens of P. niger conceivably reveal more examples?

There are old records from the London area, Hampshire, west Cornwall and the last from Marlborough in 1925 (a record on the NBN Atlas from 2000 has been confirmed as erroneous). Whilst dedicated survey effort has not been put into searching for the species, one would expect the species to be detected were it still present, and the gap of nearly a century without a record means that a status of Regionally Extinct has been applied.

Older records are widespread, but come to an abrupt halt in 1959 (a 2017 record was confirmed as erroneous). Benson (1951) notes as 'common in the fens' and says the larvae are a 'well-known pest of wheat, barley, rye and various wild grasses'. There seems to have been a catastrophic decline, apparently to complete loss. Whilst dedicated effort has not been put into searching for this species it seems highly unlikely that it would be entirely overlooked were it still present. Could pesticides have been particularly effective against this species? A status of Regionally Extinct has been assigned.

Taking the data at face value, there are records from about 23 localities, distributed from Cornwall to Durham except for an outlier in East Dunbartonshire. All are pre-1950 except for a Wiltshire record in 1970. This suggests a species that was scarce but widespread, and one that has since suffered a major decline. Although there may not have been effort devoted to relocating this species, other black Arge species are regularly recorded and so its absence for 50 years strongly suggests that the species should now be considered Regionally Extinct.

This species has only been recorded on five occasions, at a variety of locations across southern England between 1907 and 1947 but not since. It has been detected both as an adult and through its larval feeding habits. There would seem no obvious reason why an oak-feeding species noted from several widely-spaced locations in southern Britain should have disappeared, but although there may have been little dedicated effort employed to try to relocate it, the lack of records for over 70 years is striking. The evidence suggests it should hence be considered Regionally Extinct.

Benson (1952) was not aware of records subsequent to those from Wicken Fen in the late 19th or early 20th century. Subsequent records found in a range of databases have all been confirmed to be erroneous (based on a taxonomic error in some biological recording software leading to some records of T. temula being mis-translated as this species). The species is therefore assessed as Regionally Extinct.

To date this species has only been recorded twice in Britain, at Fairbourne on the west coast of Wales in 1942 and at Hafren Forest in Montgomeryshire in 1975. There is no reason to consider these records not to relate to wild individuals, and so with no further records for nearly 50 years, the species is considered Regionally Extinct. However, it should still be sought, particularly in Wales.

Benson (1952) was only aware of a single record of this species, from Northumberland in 1873. There is an additional unconfirmed 1874 record from Glasgow, but no further confirmed records. With the last record being more than 30 years ago, the species is considered Regionally Extinct.

The only records of this species are a series from Speyside between 1943 and 1949. The lack of any subsequent records indicates a status of Regionally Extinct is appropriate. However, this is an early-flying species and it may not have been sought by entomologists early enough in the year.