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Genus Condylostylus

which long-legged fly ? - Condylostylus 8026477 Chrysotus? - Condylostylus - female Dolichopodidae ? - Condylostylus Condylostylus longicornis? - Condylostylus longicornis Yellow-green Fly in Virginia - Condylostylus Dolichopodidae - Condylostylus Condylostylid Long-legged Fly? - Condylostylus Condylostylus? Which one? - Condylostylus - male
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon (Orthorrhapha)
Superfamily Empidoidea
Family Dolichopodidae (Longlegged Flies)
Subfamily Sciapodinae
Genus Condylostylus
Explanation of Names
Condylostylus Bigot 1859
~35 species north of Mexico(1)(2)(3), but most are found in the East. Over 300 species worldwide, most of them in Central America and tropical South America.
The distinctive character of Condylostylus is a pair of setose mounds on the frons bearing the vertical setae.(4) When present, wing markings in the form of two bands joined along the costa will distinguish Condylostylus from other American Sciapodinae. In addition, the following combination of typical, but not universal, characters can help ID the genus:
vertex deeply excavated
M distinctly forked (unforked in Mesorhaga)
frons usually with pale bristles in addition to black (usually only black in Sciapus)
setae of calypter usually black (usually pale in Sciapus)
scutellum with two pairs of bristles (outer pair reduced or absent in Sciapus)
In many species, vein M1 is more sharply curved towards the base of the wing than in other genera.

Males have narrow abdomens that don't get narrower, whereas females have rounder abdomens that taper to a point.
Temperate North America, the Neotropics, Pacific islands, Africa
Typically, moist forests
Life Cycle
Larvae develop in wet to dry soil and pupate in cocoons made up of soil particles cemented together. Adults mate after elaborate and unique behavior, involving the males displaying their legs to the female.
Different species are commonly found together, even on adjacent leaves.

Key to species groups found north of Florida and Texas, possibly unreliable for females along the Gulf Coast.
Notes: In some species wing markings are optional. When markings are present they may be faint and not continuous, reduced to darkened areas along veins. The standard U-shaped wing pattern is two bands across the wing joined by a band between C and R5. A few species without wing markings may have a faint cloud near the tip of R2+3.
Note from Zachary Dankowicz: Some uncommon species don't key out correctly, so use this key with caution. The species mentioned in the key will work.

C1. Legs and antennae of both sexes completely black. → C2
C1'. At least part of fore or mid legs beyond coxae yellow or brown. → C4

C2. Male: usually pure blue, costal cell expanded, costa with long cilia, R1 ending distinctly past midwing, second segment of fore tarsi very short. Wing unmarked. Southeast USA, Neotropics. → C. mundus
C2'. R1 not ending past midwing, usually shorter. Wing usually with U-shaped mark. Never completely blue; sometimes with blue reflections. → C3

C3. Face with long, pale hairs. Segments 2-4 of fore tarsi similar (female) or 2-3 similar and 4 longer (male). East of Great Plains → C. patibulatus
C3'. Face bare or with dark hairs. Great Plains to Pacific → C. melampus, C. coloradensis, C. pilicornis.

C4. Antennae longer than head and thorax combined. Fore and mid tibiae with about four very long hairs. Femora of both sexes dark. → C. comatus group (comatus, crinitus, villosus)
C4'. Antennae of normal length. Femora of female usually pale. → C5

C5. Wing with U shaped marking, sometimes very faint or only present along veins → C6
C5'. Wing unmarked, occasionally with cloud near tip of R2+3 → C7

C6. Femora and tibiae of both sexes yellow. East → C. sipho group (six species)
C6'. Femora of male dark. Georgia to Arizona → C. inornatus, C. leonardi, C. quadricolor (unrelated species)

C7. Fore and mid femora of both sexes yellow. Face bare → various rare species
C7'. Almost all femora of male dark (flavipes has yellow femora), of female yellow or dark. Face bare or with long, white hairs → C8

C8. Tibiae yellow, hind tibia usually darkened near tip. M1 gradually curved, making approximately right angle with base of M. Face usually with pale hair. Male mid basitarsus usually with conspicuous curved bristles. Mid tibia of female with strong bristle near one third length. → C. caudatus group (s.l.)
C8'. Mid basitarsus of male with row of fine hairs. Legs black except fore tibiae of male and fore and mid tibiae of female. Hind tibia of both sexes and mid tibia of male with row of about 12 bristles. Face bare. → C. longicornis
Print References
Curran C.H. (1942) American Diptera. Bull. AMNH 80: 51-84 (key to Laxina; Full text)
Works Cited
1.Catalog of the Dolichopodidae (Diptera) of America north of Mexico
Marc A. A. Pollet et al. 2003. American Museum of Natural History.
2.Checklist of Dolichopodidae s.str. of America North of Mexico
3.A Synopsis of the Dolichopodidae of the Southeastern United States and Adjacent Regions
Harold Robinson. 1964. Entomological Society of America.
4.The Australian Sciapodinae
Daniel J. Bickel. 1994. Australian Museum.