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Subfamily Crabroninae - Square-headed Wasps

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A revision of the genus Larropsis Patton (Hymenoptera: Sphecidae)
By Bohart R.M., Bohart G.E.
Trans. Am. Ent. Soc. 92: 653-685, 1966

A revision of the Larropsis subgenus Ancistromma Fox (Hymenoptera: Sphecidae)
By Bohart R.M., Bohart G.E.
Proc. Ent. Soc. Wash. 64:21-37, 1962

Revision of North American Liris Fabricius (Hymenoptera: Sphecoidea: Larridae)
By Karl V. Krombein, Sandra Shanks Gingras
Smithsonian Institution Press, Smithsonian Contributions To Zoology, No. 104 (96 pp.), 1984

The Wasps of the Genus Pisionopsis Fox (Hymenoptera Sphecidae)
By Williams F.X.
Pan-Pac. Entomol. 30: 235-246, 1954
Still a good key to the genus and good descriptions.

California wasps of the genus Oxybelus (Hymenoptera: Sphecidae, Crabroninae)
By Bohart R.M. and Schlinger E.I.
Bulletin of the California Insect Survey 4(4): 103-142, 1957
Full text here.

Synopsis of the California species with a key to North American species.

The wasps of the genus Solierella in California (Hymenoptera, Sphecidae, Larrinae)
By Williams F.X.
Proc. CAS (Ser.4) 26: 355-417, 1950

Composition of spider prey captured by the wasp Trypoxylon (Trypargilum) tridentatum tridentatum in two habitats in an oasis in
By Karina Domínguez & María Luisa Jiménez
The Canadian Entomologist 140: 388–392, 2008
Complete title: "Composition of spider prey captured by the wasp Trypoxylon (Trypargilum) tridentatum tridentatum in two habitats in an oasis in Baja California Sur, Mexico"

Full Text

Wasps of the Genus Trypoxylon Subgenus Trypargilum in North America (Hymenoptera, Sphecidae)
By Rollin E. Coville
University of California Press, Entomology, Volume 97, 1982

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