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Species Ceriana tridens

Puzzling! Not even sure it's a syrphid. Your take? - Ceriana tridens - male Fly - Ceriana tridens - male Wasp Mimic - Ceriana tridens - female Not a yellow jacket? - Ceriana tridens - female odd syrphid(?) - Ceriana tridens - male Wasp Mimic Syrphid Fly? - Ceriana tridens - female syrphid fly - Ceriana tridens - male saved from a swimming pool - Ceriana tridens
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon ("Aschiza")
Family Syrphidae (Hover Flies)
Subfamily Eristalinae
Tribe Cerioidini
Genus Ceriana
Species tridens (Ceriana tridens)
Synonyms and other taxonomic changes
Ceria tridens Loew, 1872
Cerioides tridens Curran 1924
Tenthredomyia tridens Shannon 1925
Explanation of Names
Ceriana tridens (Loew 1872)
Some resources for to aid in ID of C. tridens:
Curran's 1924 "Cerioides" key (treats the Cerioidini he had avaialble at the time and is thus incomplete...but still useful).
Curran's detailed 1924 description of Ceriodes(= Ceriana) tridens is here.
Loew's 1872 original description of Ceria(= Ceriana) tridens is here.
w. NA(1)
Print References
Curran, C. H. (1924). Subfamily Cerioidinae, Genus Cerioides in: Contribution to a monograph of the American Syrphidae from North of Mexico. Univ. of Kansas Sci. Bull. 15:77-216 (Full Text)
Loew, H. (1872). Diptera Americae septentrionalis indígena. Centuria decima. Berlin. Ent. Ztschr. 16: 49-115. (Full Text)
Ricarte A., Marcos-García M., Rotheray G., Hancock E. (2007). The early stages and breeding sites of 10 Cerioidini flies (Diptera: Syrphidae). Ann. Ent. Soc. Am. 100: 914-924 (Full text)
Shannon, R.C. (1925) The syrphid–flies of the subfamily Ceriodinae in the U.S. National Museum Collection. Insecutor Inscitiae Menstruus, No. 13, 48–65. (Full Text)
Williston, S. W. (1886). Ceria on pp. 259-265 in: Synopsis of North American Syrphidae. Bull. U.S. Natl. Museum, 31:1-335 (Full Text)
Internet References
Lectotype images of Ceria tridens from the Museum of Contemporary Zoology, Harvard Univ.