The five species of the Pectinipes species group are characterised by their numerous pecten spines. All have at least 10, and some as many as 42! This female has 12 I can count, and probably more. Compare to Fig. 36 (Evans & Matthews, 1973).

Bembix flavifrons

Image courtesy Reiner Richter
https://inaturalist.ala.org.au/observations/150716071