Dytiscus La Brea Beetle Cast. Dytiscus Beetle is a water diving beetle from the Pleistocene. These were found at the La Brea Tar Pits in California. La Brea Tar Pits is a massive tar field that often has a water covering masking its dangerous gooey substance below. Mammals, reptiles, birds and insect have been found trapped throughout these fields. Dytiscus La Brea Beetle cast measurement is 5 cm x 2.5 cm.