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"?How can I distinguish S. funerarios to S. flavipennis?"

Females: By details in pubescence on mesonotum (thorax). S. flavipennis has a more golden and more shiny pubescence, which larger hairs, funerarius is grey with thin haires. Not visible here.
Males: by details in structure of antennal segments.

The species of Sphex are, against of its size, difficult to identify.

Regards, Christian