Observation - Cassida nebulosa - UK and Ireland. Description: Brown Tortoise Beetle
From Charlie Barnes, Mick - this is an excerpt from my report in the Lincolnshire Naturalists' Union transactions for 2010: "Adrian recorded the tortoise beetle Cassida nebulosa in the Limewoods during August 2010. It was last recorded in Lincolnshire in 1907..." Adrian's record was from the North Lincolnshire vice-county - your record is the 4th overall for Lincolnshire and 2nd for South Lincolnshire. The first record from South Lincolnshire being an undated one from the Nocton area, but I'm pretty certain this beetle hasn't been seen in South Lincolnshire for over 100 years. Awesome!