The uniquely shaped front basitarsus (straight arrow) of Bembix palmata is worth showing again. Note too the broadly expanded lobes of front tarsomeres 2, 3 and 4 (stars).

The shape of the male antenna is another feature that can helpful in species recognition. Modifications tend to start at flagellomere 5 (curved arrow), and in this species it is strongly spinose. Compare to Fig. 121 (Evans & Matthews, 1973).

Bembix palmata

Image courtesy Reiner Richter
https://inaturalist.ala.org.au/observations/105595939