Grass-carrying wasp, Isodontia mexicana (de Saussure) new to Britain

Grass-Carrying Wasp, Isodontia mexicana (de Saussure), is recorded as new to Britain. Morphological characters are given, and illustrated, to establish its identity and a key is provided to distinguish it from other British Sphecidae. Notes are provided on bionomics, the circumstances of its arrival and its status in Britain.

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