I have been trying to record Telmatoscopus tristis (Meigen, 1830) but it does not appear to be present on irecord. It is a valid species on NBN. The number of species in Telmatoscopus on iRecord is very low compared to those known in the UK. Perhaps it is placed in another genus? However sorting through tristis I did not spot a Dipteran that appeared in Psychodidae in a genus I knew.
I have just tried by copying and pasting Telmatoscopus tristis into the species box and it came up for me, so it does appear to be present on iRecord, so all I can suggest it to try again in case the database was playing up the first time you tried to enter it?