Abstract
Two new species of butterfly bug, Valdicossus mikewebsteri sp. nov. and Ilerdocossus prowsei sp. nov. are described from the Lower Cretaceous of southern England. Valdicossus mikewebsteri is the first complete hindwing of a palaeontinid from the UK. It is different from the type species in having a hindwing with a different colour pattern, vein Sc + R straight, and branch RA2 slightly curved posteriorly then recurved; the length of vein RP + MP1 is shorter than that of the type species and vein A1 is short. Ilerdocossus prowsei sp. nov. is described based on a well-preserved forewing from the Lower Weald Clay (upper Hauterivian) of England; it is different from other species of the genus in possessing a narrower forewing and vein CuA bifurcating beyond the nodal line; the membrane is pitted distal of the nodal line.
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