Abstract
Tatochila autodice and T. blanchardii, common native ‘cabbage butterflies’ whose combined range covers most of the southern half of South America, intergrade in the only region where they are known to be in contact—north-western Argentine Patagonia. The zone of intergradation is centred east of the Hua Hum and nearby low passes, with decreasing influence of the Chilean blanchardii both northwards and southwards. Larvae and pupae from the zone display some phenotypic traits never observed elsewhere. The zone is largely concordant with one in which three members of the Tatochila sterodice species-group are also hybridizing.
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