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Species Pseudomasaris vespoides

Pseudomasaris vespoides Pseudomasaris vespoides - male Patrolling Male Pseudomasaris and Female I - Pseudomasaris vespoides - male - female Pseudomasaris Attempted Mating - Pseudomasaris vespoides - male - female Male Pollen Wasp - Pseudomasaris vespoides - male Psuedomasaris from Diablo Range - Pseudomasaris vespoides - female Genus Pseudomasaris - Pseudomasaris vespoides - male Genus Pseudomasaris - Pseudomasaris vespoides - male
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 Vespoidea (Yellowjackets and Hornets, Paper Wasps; Potter, Mason and Pollen Wasps and allies)
Family Vespidae (Yellowjackets and Hornets, Paper Wasps; Potter, Mason and Pollen Wasps)
Subfamily Masarinae (Pollen Wasps)
Genus Pseudomasaris
Species vespoides (Pseudomasaris vespoides)
Synonyms and other taxonomic changes
Masaris vespoides Cresson, 1863   [Detailed original description]
Pseudomasaris vespoides robertsoni Cockerell, 1913   [Brief original description]
A sharp transverse ridge right above the antennal sockets sets females of this species apart from all other Pseudomasaris.
Males can be separated from their congeners by the antennal club being longer than antennal segment III, and concave on the underside. Also, gastral tergite VII (almost always) has a pair of dorsal tubercles. Fore basitarsus with a long posterior fringe; hind basitarsus is curved and distally lobed.
(Above based on Richards, 1963, and 1966; see references)
Pale markings tend to be less extensive in individuals of northerly populations; they're also more whitish than yellowish. (Information from Roy Snelling, Natural History Museum of Los Angeles County; personal communication-HW)
Photos of males:

Western USA (AZ, CA, CO, ID, MT, NE, NM, NV, OR, SD, UT, WA, WY), to Baja California (Mexico).
Adults are found on or near various species of Penstemon, where they feed on nectar, and the females collect pollen for their larval brood cells.
Print References
Richards, O.W. The species of Pseudomasaris Ashmead (Hymenoptera, Masaridae). U.C. Press. 1963
Richards, O.W. New records of Pseudomasaris Ashmead (Hymenoptera: Vespoidea, Masaridae), with notes on P. phaceliae Rohwer and P. cazieri R.M. Bohart. Proc. Royal Ent. Soc. London (B), 35 (3-4), pp. 47-55. 1966
Torchio, Philip F. 1974. Mechanisms Involved in the Pollination of Penstemon Visited by the Masarid Wasp Pseudomasaris vespoides (Cresson). The Pan-Pacific Entomologist 50:226-234.