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Genus Geron

Fly - Geron Fly - Geron Bee Fly - Geron - Geron Sandhills Beefly - Geron - male FL bombyliid - Geron - female Geron for Aaron #7 - Geron Unknown flies - Geron Geron? - Geron
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon (Orthorrhapha)
Superfamily Asiloidea
Family Bombyliidae (Bee Flies)
Subfamily Toxophorinae
Genus Geron
Explanation of Names
Geron Meigen 1820
Greek 'old man' (imagine a humpbacked man carrying a cane)
~35 spp. in 2 subgenera in our area, >170 spp. in 4 subgenera worldwide(1)(2)
Humpbacked appearance, conical abdomen, long antennae with a tapered 3rd segment, 3 posterior cells.
Worldwide and across NA(1)
Parasitoids (?endo) of larvae or pupae of Noctuidae, Psychidae, Pyralidae & Tortricidae in concealed situations, also hyperparasitoids
Life Cycle
Larvae are parasites of other insects: they have been reported on several species of moths.
Adults take nectar at flowers, especially sunflowers (Asteraceae).
Unlike many other bombyliids, Geron will often bob up and down above an inflorescence prior landing to nectar. Males often form loose swarms. (2)
The only member of the tribe Gerontinae(1)
See Also
Members of Usiinae (e.g. Apolysis) have blunt-tipped antennae (pointed in Geron) --compare(3). Phthiriinae have four posterior cells (e.g. see here).
Print References
Painter, R. H. (1932). A Monographic Study of the Genus Geron Meigen as It Occurs in the United States (Diptera: Bombyliidae). Trans. Amer. Entomol. Soc. 58 (2): 139-168 (1st page at JSTOR)