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Genus Callicera

Fly - Callicera erratica - male Callicera erratica - male Callicera erratica - male Callicera erratica - female Callicera erratica - female syrphid fly - Callicera erratica - female Very neat syrphid! - Callicera erratica - female Very neat syrphid! - Callicera erratica - female
Classification
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 Callicerini
Genus Callicera
Explanation of Names
Callicera Panzer 1806
Greek calli 'beautiful' + cera 'horn' (refers to the distinctive antennae)
Numbers
3 spp. in our area(1) (2):
Callicera duncani Curran, 1935
Callicera erratica (Walker, 1849)
Callicera montensis Snow, 1892
Identification
Eyes pilose; third antennal segment tapering from base (Weems 1953)
  

Quoting Thompson (2):
Callicera is separated from all the other syrphid flies by the following combination of characters:
1) Antenna with terminal arista instead of subbasal arista;
2) basal anterior crossvein before middle of discal cell; and
3) pilose face and eye.
Range
in our area, e. & sw. US(1)
Internet References
Works Cited
1.Key to the genera of nearctic Syrphidae
Miranda G.F.G, Young A.D., Locke M.M., Marshall S.A., Skevington J.H., Thompson F.C. 2013. Can. J. Arthropod Identification 23: 1-351.
2.The North American Species of Callicera Panzer (Diptera: Syrphidae)
F. Christian Thompson. 1980. Proc. Entomol. Soc. Wash. 82(2): 195-211.