The clypeus and labrum are just visible here: the clypeus yellow, with black markings basally; the labrum yellow (at least laterally). That is probably enough to exclude the following:
- B. musca (which has black along the sides of the labrum)
- B. lamellata (in which the labrum and clypeus are wholly black)
- B. furcata & B. thooma (both with labrum wholly black)

I can also exclude B. trepida on the basis of:
- the long pecten spines (they are short in B. trepida)
- the clypeus looks smoothly rounded (not abruptly flattened as in B. trepida … although this may be difficult to judge from this angle)

It is this shot that confirms Wasp 03 as male. There are seven visible tergites. Female Bembix have just six.

The vertex looks high, about level with the eye tops. So that fits with B. littoralis … and B. variabilis, B. musca, B. lamellata, etc. The very broad apex also fits with B. littoralis … and B. variabilis males.

However, B. variabilis has much wider metasomal bands.