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Species Pepsis grossa

Pepsis collected near Laredo, TX - Pepsis grossa - female 7006259-Pepsis - Pepsis grossa - male Pepsis grossa/formosa ? - Pepsis grossa - female 7006259-Pepsis - Pepsis grossa - male Pepsis? - Pepsis grossa - male Pepsis? - Pepsis grossa - male Pepsis? - Pepsis grossa - male Pepsis grossa
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon (Aculeata - Ants, Bees and Stinging Wasps)
Superfamily Pompiloidea (Spider Wasps, Velvet Ants and allies)
Family Pompilidae (Spider Wasps)
Subfamily Pepsinae
Tribe Pepsini
Genus Pepsis (Tarantula Hawks)
Species grossa (Pepsis grossa)
Synonyms and other taxonomic changes
Pompilius formosus Say, 1823
Pepsis nephele Lucas, 1894
Pepsis obliquerugosa Lucas, 1895
Pepsis psuedoformosa Cockerell, 1898
Pepsis pattoni Banks, 1941
Explanation of Names
Pepsis grossa (Fabricius, 1798)
Identification
Very large, with two color forms: Orange-winged (xanthic) and black-winged (melanic). The two color forms are not often seen in the same locality. Melanic forms are easily confused with Pepsis mexicana, but that species is always much smaller in size than P. grossa.

Males of P. grossa are unique in the genus in having only 12 antennal segments (scape, pedicel, and 10 flagellomeres). Males of all other Pepsis species have 13 antennal segments (or equivalently, 11 flagellomeres)(1). (Male Pepsis have thicker, straighter antennae and 7 visible abdominal segments; females have narrower, curled antennae and 6 visible abdominal segments.)
Remarks
Formerly known by the name Pepsis formosa, until synonymized with P. grossa in 2002 by Vardy(1).
Print References
Vardy(1)(2002)...see Part 2: pg. 58
Hurd(2)(1952)...as P. formosa, see pg 283.
Works Cited
1.The New World tarantula-hawk wasp genus Pepsis Fabricius (Hymenoptera: Pompilidae).
C. R. Vardy. 2005. Zoologische Verhandelingen / Zoologische Mededelingen.
2.Revision of the Nearctic species of the Pompilid genus Pepsis (Hymenoptera, Pompilidae)
Paul D. Hurd. 1952. American Museum of Natural History, New York.