Teratocoris species are green bugs found in damp or wetland habitats. They have a transverse furrow between the eyes. Species identification is particularly difficult in females. The 1st antennal segment is usually mainly green and densely covered with coarse fairly long hairs. The sides of the pronotum are almost straight. 

Teratocoris viridis, T. caricis.

Good quality photos required. 

Marsh and wet grassland. 

Found widely across the UK. 

Rarely recorded in Leicestershire and Rutland.

https://www.britishbugs.org.uk/heteroptera/Miridae/teratocoris_saundersi.html