lists 3 North American species in the genus.
Forewing length 11-27 mm (2)
, body length somewhat longer (and appearing longer yet when taking into account the long legs and antennae).
Key to species on pg. 33 of Townes(1957)
Hemipepsis are quite similar looking to Pepsis and Entypus, but distinguishable if clearly resolved images of wing venation are available. For details, see the posts thumbnailed below:
See also comments by Nick Fensler under this post
are called "Tarantula Hawks." The genera are difficult to distinguish in the field and have very similar life histories. See account for Pepsis.
Milne has photo of Hemipepsis sp.
--#458, describes, p. 839. (3)
Univ. Calif. Riverside Insect FAQ
--describes biology of Pepsis and Hemipepsis as identical, says genera difficult to distinguish (based on wing venation).