Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada

Species Sphecius grandis - Western Cicada-killer Wasp

Western Cicada Killer? - Sphecius grandis Western/Pacific Cicada Killer Wasp - Sphecius grandis Wasp? - Sphecius grandis Oregon Hornet - Sphecius grandis large wasp - Sphecius grandis large wasp - Sphecius grandis Western Cicada Killer - Sphecius grandis Sphecius grandis
Classification
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)
No Taxon (Apoid Wasps (Apoidea)- traditional Sphecidae)
Family Crabronidae
Subfamily Bembicinae
Tribe Bembicini (Sand Wasps)
Subtribe Spheciina
Genus Sphecius (Cicada-killer Wasps)
Species grandis (Western Cicada-killer Wasp)
Synonyms and other taxonomic changes
Sphecius grandis (Say, 1823)
Orig. Comb: Stizus grandis Say, 1823
Identification
Punctation density in the middle of T1 and T2 is approximately equal in S. grandis (photo below). This is noticeably less dense on T2 compared to T1 in S. convallis.(1)


Antennal segments II-IV are curved ventrally (at the tyloids/ sensory organs) in S. grandis, so the segments looking more bead-like (photo below). In S. convallis antennal segments II-IV are not curved ventrally, and are tube-like.(1)


Specimens often, but not always, have more extensive yellow markings than in S. convallis.(1)
Range
Western U.S. (CA-TX-NE-WA) / s. to C. Amer.
Food
Adults feed on nectar. Females hunt cicadas to provision their offspring.
Print References
Holliday, C.W., and J.R. Coelho. 2006. Improved Key to New World Species of Sphecius (Hymenoptera: Crabronidae). Ann. Entomol. Soc. Am. 99(5):793-798.
Works Cited
1.Improved key to New World species of Sphecius (Hymenoptera: Crabronidae)
Holliday C.W., Coelho J.R. 2006. Ann. Ent. Soc. Am. 99: 793-798.