Black sawfly on grass

Black sawfly on grass

Observation - Black sawfly on grass - UK and Ireland. Description: Black sawfly on grass stem, around 10mm. Dolerus sp. I think. I believe these are tricky to ID to species but here's hoping...

Black sawfly on grass stem, around 10mm. Dolerus sp. I think. I believe these are tricky to ID to species but here's hoping...