Rhinoceros Stag Beetle
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Sinodendron cylindricum
Common in small numbers around Britain.
Despite being in the family Lucanidae (Stag Beetles), they look rather like true Rhinoceros Beetles, which are well known for their rhinoceros-like horn.
The body is cylindrical and the elytra and thorax have distinct rows of pits and grooves.
The Males have a well-developed horn on their heads, which is significantly smaller in the Females.
In addition, the cavities on the pronotum in the Female are much shallower than the distinct cavities in the Male.
The larvae are white and soft with brown heads.