Oulema obscura - Development
Top row: This little larva had just shortly before shed its skin with poo-camouflage (top left) and was beginning to build up a new camouflage slime layer with excrements.
Bottom row: Before pupating, it sheds its slimy skin with excrements one last time and spins a somewhat sponge-like cocoon. About two weeks later the beetle emerges.
Have a look at 10Oulema for more images of similar larvae.
Oulema obscura (Stephens, 1831) is a small Leaf Beetle (Chrysomelidae) in the subfamily Criocerinae. Like other Oulema spp. it feeds mostly on grasses and cereals.