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Genus Episyron

Spider Wasp - Episyron quinquenotatus Spider Wasp - Episyron quinquenotatus - female digger wasp? - Episyron Silvery Wasp on Sotol - Episyron Episyron biguttatus or different ? - Episyron - female Spider Wasp - Episyron biguttatus Spider Wasp on Goldenrod flowers - Episyron quinquenotatus Episyron canterminus? - Episyron - female
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 Pompilinae
Tribe Pompilini
Genus Episyron
Five species (E. biguttatus, E. conterminus, E. oregon, E. quinquenotatus, and E. snowi). Three are polytypic.
5-17 mm; females>males.
This genus belongs to the subfamily Pompilinae, tribe Pompilini and is identified by the following characters:
Spines at apex of hind tibia of unequal length and spacing.
Hind tibia always smooth in nearctic species.
Dorsal side of hind femur with at least a few spine pits.
Pocket in the basioposterior corner of the third discal cell.
Labrum at least partially concealed.
Females of this genus possess a tarsal comb.

This genus is identified by the following characters:
Postnotum expanded laterally at the spiracles.
Anal vein of posterior wing meeting the medial vein beynd the origin of the cubitus.
Possess a row of spines on the apical tarsal segments.
Possess an appressed, scale-like pubescence on the thorax, propodeum, and first tergite.
Some are marked with white on the abdomen.
Found in sandy areas.
In the north they are present from May through September, slightly longer in the south.
Adults capture orb weavers (Araneidae) (1) to provision their nests. Adults also frequent flowers, especially males.
Life Cycle
Females are fossorial and as stated above provision only with Araneid spiders. They have several generations per year.
See Also
The appressed, scale-like pubescence on the thorax, propodeum and abdomen is distinctive in nearctic pompilines. Structurally most similar to Poecilopompilus and Sericopompilus.
Print References
Evans, H.E. 1950. A taxonomic study of the nearctic spider wasps belonging to the tribe pompilini, Part I. Trans. Amer. Entomol. Soc., 75: 133-270.

Krombein, K.V. 1979. Pompilidae, pp. 1523-1571. In Krombein, K.V., P.D. Hurd, Jr., D.R. Smith, and B.D. Burks, eds. Catalog of Hymenoptera in America North of Mexico. Vol. 2 Apocrita (Aculeata). Smithsonian Inst. Press, Washington, D.C.

Wasbauer, M.S., and L.S. Kimsey. 1985. California Spider Wasps of the Subfamily Pompilinae (Hymenoptera: Pompilidae). Bull. Calif. Insect Survey, Vol. 26
Works Cited
1.Orb Weavers