Ceraturgus Wiedemann

Barnes, Jeffrey K., 2008, Review of the genus Ceraturgus Wiedemann (Diptera: Asilidae) in North America north of Mexico, Zootaxa 1766, pp. 1-45 : 6-7

Key to the species of Ceraturgus Wiedemann occurring in North America north of Mexico

1 Third flagellomere long, as long as or longer than scape and pedicel combined, densely covered with long pubescence ........................................................................subgenus Ceraturgus Wiedemann. ..................2

- Third flagellomere short, about as long as scape, densely covered with short pubescence .. subgenus Ceraturgopsis Johnson. .....................................................................................................................................8

2 Larger species, rarely under 16 mm long; wings distinctly infuscated, especially anteriorly, near base; male prothoracic pulvilli brown, female pulvilli yellow.............................................................................3

- Smaller species, rarely over 14 mm long, wings mostly or completely hyaline, or only lightly uniformly infuscated; male and female pulvilli all yellow...........................................................................................6

3 Face white or pale yellow pollinose; mystax white; third flagellomere much shorter than first flagellomere; scutellar margin with many moderately strong bristles as long as or longer than scutellum; hind tibia and tarsus black, often lighter at articulations; wings lightly infuscated at base; abdominal tergites 2–3 with white posterior pollinose bands produced forward at lateral margins; Pennsylvania and Florida west to Nebraska and Texas............................................................. Ceraturgus (Ceraturgus) mitchelli Brimley

- Face golden pollinose; mystax yellowish brown to brown; third flagellomere about as long as or longer than first flagellomere; scutellar margin with only very weak hair-like setae shorter than or equal to length of scutellum; all tibiae and tarsi yellow; wings infuscated throughout, especially at base; abdominal tergites 2–3 with yellow posterior pollinose bands not produced forward at lateral margins .......................... 4

4 Postalar callus mostly shining brown, with small patch of golden pollen posteromesially; abdominal tergites 1–3 usually with posterior pollinose bands; band on tergite 1 usually complete; bands on tergites 2–3 usually broken in middle; tergite 4 sometimes with pollinose patch in posterolateral corner, rarely with complete posterior band; tergite 5 rarely with pollinose patch in posterolateral corner; tergites 6–7 lacking pollen; sternites 2–6 mostly devoid of pale pollen, but sternite 2 or sternites 2–3 sometimes with posterolateral pale yellow pollinose patches; Pennsylvania and Georgia west to Oklahoma and Texas.................. ........................................................................................... Ceraturgus (Ceraturgus) elizabethae Brimley

- Postalar callus mostly white to golden yellow pollinose; abdominal tergites 1–6 or 1–7 with complete posterior pollinose bands; sternites 2–6 almost completely pale pollinose or with broad posterior pale yellow pollinose bands............................................................................................................................................5

5 Male face white tomentose; male mystax sordid white; female face pale golden tomentose; female mystax golden yellow; frons mostly white or pale yellow pollinose, except at midline; postgena, stipes and palpi with dense vestiture of white hair-like setae; male sternites 2–6 almost completely white pollinose; female sternite 2 completely or almost completely yellow pollinose; Midwest........................................................ ........................................................................................................ Ceraturgus (Ceraturgus) cruciatus (Say)

- Male and female face rich golden tomentose laterally, brown centrally; male and female mystax brown or bronze; frons mostly shining dark brown, except for golden brown pollinose band along inner eye margin; postgena, stipes and palpi with dense vestiture of dark brown or black hair-like setae; male sternites 2–6 mostly brown, with elongate yellow pollinose patches in posterolateral corners; female sternite 2 with complete or broken posterior yellow pollinose band; southern Ontario, Maine and South Carolina west to Michigan and Mississippi......................................................... Ceraturgus (Ceraturgus) fasciatus Walker

6 Occipital setae golden; femora and tibia mostly yellow with dark brown or black apices; small species;

rarely over 11 mm long; Massachusetts to Georgia and Michigan ............................................................... .......................................................................................... Ceraturgus (Ceraturgus) aurulentus (Fabricius) - Occipital setae black; femora wholly dark brown or black; tibiae variable; larger species, usually over 12 mm long......................................................................................................................................................7

7 Tibiae mostly yellow, dark brown or black apically; Vermont and Massachusetts west to New York and West Virginia ................................................................................. Ceraturgs (Ceraturgus) similis Johnson

- Tibiae black; North Carolina, South Carolina, Georgia, and Tennessee ....................................................... ................................................................................................. Ceraturgus (Ceraturgus) nigripes Williston

8 Scutum white pollinose laterally and posteriorly; smaller species, rarely over 14 mm long; wings nearly hyaline; femora, tibiae, and tarsi dark brown to black; female abdominal tergites 1–5 with white posterior pollinose band; Texas and Oklahoma ..................... Ceraturgus (Ceraturgopsis) oklahomensis (Bromley)

- Scutum yellow or white pollinose laterally and posteriorly; larger species, usually over 14 mm long; wings distinctly infuscated; femora, tibiae, and tarsi yellow to reddish brown; female abdominal tergites 1–5 or 1–7 with yellow posterior pollinose bands; southeastern United States..........................................9

9 Dark brown, non-pollinose areas of the scutum lacking hair-like setae, except for a narrow median longitudinal line and prescutellar patch of short, reclinate, golden hair-like setae; male sternites 1–7 mostly covered with yellow pollen; only female abdominal tergites 1–5 with yellow posterior pollinose bands; female tergites 6–7 shining; larger species, 17.9–19.5 mm long; southeastern United States...................... .................................................................................... Ceraturgus (Ceraturgopsis) cornutus (Wiedemann)

- Scutum covered with short, reclinate, golden hair-like setae throughout, including non-pollinose areas; male sternites 1–2 mostly covered with yellow pollen; male sternites 3–7 mostly shining brown, with yellow pollinose lateral and posterior margins; female abdominal tergites 1–7 with yellow posterior pollinose bands; smaller species, 13.7–17.6 mm long; Florida ............. Ceraturgus (Ceraturgopsis) johnsoni Martin