Geographical Colour Polymorphism and Chromosome Constitution in Sympatric Species of Sawflies

Abstract

THE taxonomy of the arcuata-schaefferi group of Tenthredo sawflies has been a matter of interest both on the Continent¹ and in Britain^{2 3} for some considerable time. The adults are strikingly similar and interspecific differences can be discerned in the females only. Good descriptions of larvæ have not been available for some of the species, and existing accounts in some cases appear vague and confusing, so that doubt exists as to whether reported differences are of inter- or intra-specific rank.