Abstract

Several Nearctic spider wasp genera and subgenera in the subfamily Pompilinae (Hymenoptera: Pompilidae) in the arid western United States and northern Mexico are characteristically blue, violet, or purple in color: Aporus Spinola; Plectraporus Bradley; Chelaporus Bradley; Psorthaspis Banks; Chalcochares Banks; Evagetes Lepeletier; and Allochares Banks. Other genera and subgenera of Pompilinae in western U. S. and northern Mexico have one or more bluish or violaceous species: Episyron Schiødte; Notiochares Banks; Pompilinus Ashmead; Anoplius Dufour; Hesperopompilus Evans; Ammosphex Wilcke; and Arachnospila Kincaid. In California, 27/79 (34.2%) species of Pompilinae are blue, violet, or purple. The number of blue, violet, or purple Nearctic species in the subfamily Pepsinae in the western U. S. and northern Mexico is significantly fewer than in the subfamily Pompilinae. Only Pepsis Fabricius (Pepsini) and Auplopus Spinola and Ageniella Banks (Ageniellini) have bluish, bluish-green, greenish, or violaceous species. Black spider wasps predominate in the moist, densely vegetated, often forested, and mountainous areas of the eastern United States and Canada. Only 6/81 (7.4%) species of Pompilinae in the eastern U. S. and Canada are blue, violet, or purple. Four of the species are in the genus Evagetes.

References

• Badejo O, Skaldina O, Gilev A, Sorvari J. 2020. Benefits of insect colours: a review from social insect studies. Oecologia 194: 27–40.https://doi.org/10.1007/s00442-020-04738-1. 
• Bradley JC. 1944. A preliminary revision of the Pompilidae of the Americas exclusive of the tribe Pompilini (Hymenoptera: Pompilidae). Transactions of the American Entomological Society 70: 23–157. 
• Chapman RE, Simpson SJ, Douglas AE. 2013. The insects: structure and function, 5th edition. Cambridge University Press; New York. 959 p 
• Deyrup M, Cronin JT, Kurczewski FE. 1988. Allochares azureus: an unusual wasp exploits unusual prey (Hymenoptera: Pompilidae; Arachnida: Filistatidae). Psyche 95: 265–281. 
• Evans HE. 1950. A taxonomic study of the Nearctic spider wasps belonging to the tribe Pompilini (Hymenoptera: Pompilidae). Part I. Transactions of the American Entomological Society 75: 133–270. 
• Evans HE. 1951a. A taxonomic study of the Nearctic spider wasps belonging to the tribe Pompilini (Hymenoptera: Pompilidae). Part II. Genus Anoplius Dufour. Transactions of the American Entomological Society 76: 207–361. 
• Evans HE. 1951b. A taxonomic study of the Nearctic spider wasps belonging to the tribe Pompilini (Hymenoptera: Pompilidae). Part III. Transactions of the American Entomological Society 77: 203–340. 
• Evans HE. 1966. A revision of the Mexican and Central American spider wasps of the subfamily Pompilinae (Hymenoptera: Pompilidae). Memoirs of the American Entomological Society 20: 1–422. 
• Evans HE, Yoshimoto CM. 1962. The ecology and nesting behavior of the Pompilidae (Hymenoptera) of the northeastern United States. Miscellaneous Publications of the Entomological Society of America 3: 65–119. 
• Krombein KV. 1979. Family Pompilidae. p. 1523–1570. In: Krombein KV, Hurd PD Jr., Smith DR, Burks BD (eds.). Catalog of Hymenoptera in America North of Mexico. Volume 2, Apocrita (Aculeata). Smithsonian Institution Press; Washington, DC. 2209 p 
• Kurczewski FE. 1995. Ageniella evansi, a cavernicolous spider wasp. Sphecos 29: 10–11. 
• Kurczewski FE. 2023. Pepsis elegans Lepeletier (Hymenoptera: Pompilidae: Pepsinae)–a secretive spider wasp and centurylong conundrum. Insecta Mundi 1013: 1–15. 
• Kurczewski FE. 2024. Aposematic-habitat correlation in Nearctic species of Episyron Schiødte (Hymenoptera: Pompilidae: Pompilinae: Pompilini). Insecta Mundi 1063: 1–5. 
• Kurczewski FE, Abela AJ, Shimizu A. 2023. Chalcochares hirsutifemur (Banks) (Hymenoptera: Pompilidae: Pompilinae), a probable obligate parasitoid of Aptostichus Simon (Araneae: Mygalomorphae: Euctenizidae) in California. Insecta Mundi 1004: 1–13. 
• Kurczewski FE, Abela AJ, West RC. 2021. Nesting behavior, ecology, and functional morphology of the trapdoor spiderhunting spider wasp Aporus (Plectraporus) hirsutus (Banks) (Hymenoptera: Pompilidae). Insecta Mundi 0902: 1–23. 
• Kurczewski FE, Edwards GB. 2012. Hosts, nesting behavior, and ecology of some North American spider wasps (Hymenoptera: Pompilidae). Southeastern Naturalist 11(Monograph 4): 1–71. 
• Kurczewski FE, Edwards GB, Pitts JP. 2017. Hosts, nesting behavior, and ecology of some North American spider wasps (Hymenoptera: Pompilidae), II. Southeastern Naturalist 16(Monograph 9): 1–82. 
• Kurczewski FE, Shimizu A, Kiernan DH. 2024. Morphometric analysis and taxonomic re-evaluation of Pepsis cerberus Lucas and P. elegans Lepeletier (Hymenoptera: Pompilidae: Pepsinae: Pepsini). Insecta Mundi 1052: 1–12. 
• Pape RB. 2024. Biology and ecology of a deep cave nesting spider wasp, Ageniella evansi Townes, (Hymenoptera: Pompilidae), in Arizona. Journal of Natural History 58: 963–1054.https://doi.org/10.1080/00222933.2024.2374542. 
• Townes H. 1957. Nearctic wasps of the subfamilies Pepsinae and Ceropalinae. United States National Museum Bulletin 209: 1–286. 
• Vardy CR. 2000. The New World tarantula-hawk wasp genus Pepsis Fabricius (Hymenoptera: Pompilidae). Part 1. Introduction and the P. rubra species-group. Zoologische Verhandelingen 332: 1–86. 
• Vardy CR. 2002. The New World tarantula-hawk wasp genus Pepsis Fabricius (Hymenoptera: Pompilidae). Part 2. The P. grossa to P. deaurata-groups. Zoologische Verhandelingen 337: 1–135. 
• Vardy CR. 2005. The New World tarantula hawk-wasp genus Pepsis Fabricius (Hymenoptera: Pompilidae). Part 3. The P. inclyta to P. auriguttata-groups. Zoologische Mededelingen Leiden 79: 1–305. 
• Wasbauer MS, Kimsey LS. 1985. California spider wasps of the subfamily Pompilinae (Hymenoptera: Pompilidae). Bulletin of the California Insect Survey 26: 1–130.