Reptalus quinquecostatus

This genus is readily separated from other Cixiids by the five keels on the scutellum (three in Cixius/Tachycixius). The vertex is much broader than it is long. Genital examination is required to distinguish between this and other species in the genus. 

Unless identified by a recognised expert, a photo is required and the specimen should be examined with a microscope. In the comments box, state the key or ID method used and describe the size and identifying characters.

Adults are polyphagous and feed on grassy and sometimes on woody  plants. This species is  associated with ground that dries out and cracks open during the summer months.  Adult females lay their eggs directly in the soil near the base of host plants. The five underground nymphal stages live in soil crevices feeding on the roots. Adults emerge in the summer to feed on leaves and green shoots across a wide variety of hosts.

Spring-Autumn.

Maninly found in the south and east. 

Uncommon. 

https://www.britishbugs.org.uk/homoptera/Cixiidae/Oliarus_panzeri.html