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Family Crabronidae - Square-headed Wasps, Sand Wasps, and Allies

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The Natural History and Behavior of North American Beewolves
By Howard Ensign Evans, Kevin M. O'Neill
Comstock Publishing, 1988

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

A Review of the Nearctic Wasps of the Genus Trypoxylon (Hymenoptera: Sphecidae)
By Grace A. Sandhouse
American Midland Naturalist, Vol. 24, No. 1, pp. 133-176, 1940

A revision of New World Lyroda Say, 1937 (Hymenoptera: Crabronidae)
By Khvir V.I., Pulawski W.J.
Proc. CAS 66: 315–330, 2020

A revision of the bembicine wasps of America North of Mexico
By Parker J.B.
Proc. USNM 52: 1-155, 1917

California Bembicine Sand Wasps
By R. M. Bohart and D. S. Horning, Jr.
Bull. Calif. Insect Survey, Vol. 13, 49 pp. -- University of California Press, 1971
Full Text (PDF).

This is a useful resource for California and beyond as it has a keys to:

1) the genera of Bembicini of North America;
2) the species of Bembix in California;
3) the 10 species of Bicyrtes in North America;
4) the 7 species of Microbembex in the continental US.

Note: This reference does not cover subtribe Stictiellina (i.e. genera Glenostictia, Microstictia, Steniolia, Stictiella, and Xerostictia)...which are covered in the later companion volume Bohart & Gillaspy(1)(1985).

Studies in the nyssonine wasps IV. New or redefined genera of the tribe Nyssonini, with descriptions of new species...
By Pate V.S.L.
Trans. Am. Ent. Soc. 64: 117-188, 190, 1938
Full title: Studies in the nyssonine wasps IV. New or redefined genera of the tribe Nyssonini, with descriptions of new species (Hymenoptera: Sphecidae)
Full text

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