Callicera

Smit, John, 2014, Two new species of the genus Callicera Panzer (Diptera: Syrphidae) from the Palaearctic Region, Zootaxa 3779 (5), pp. 585-590 : 586-587

Key to the Palaearctic species of Callicera

1. Scape at least twice as long as pedicel (inner side), basoflagellomere about twice as long as scape and pedicel together..... 2

- Scape at most 1.5 times longer than pedicel (inner side), basoflagellomere about as long as scape and pedicel together...... 4

2. Style short, not much longer than maximum width of basoflagellomere. Hind femora smoothly curved and flat, ventrally. Legs usually entirely orange except for the last 2 tarsomeres, which are black. Femora may be narrowly black at base, up to the basal half in hind femora, in males. Distribution: Entire Palaearctic..................................... C. rufa Schummel

- Style distinctly longer than maximum width of basoflagellomere. Hind femora angled ventrally, ventral surface shallowly concave in apical half. Legs with at least all femora mostly black and tarsomeres 3–5 of all legs black..................... 3

3. Hairs on general body surface yellow-brown to grey brown. At least tergite 4 often extensively black haired. Hairs on scutellar disc all longer than scape. Tibiae often brownish or partially black. Genae beneath eyes proportionally wider. Distribution: Western Palearctic............................................................... C. fagesii Guerin-Ménéville

- Hairs on general body surface orange to whitish yellow. All tergites almost without black hairs. Hairs on scutellar disc no longer than scape. All tibiae orange. Genae beneath eyes proportionally narrower. Distribution: Western Palearctic........................................................................................... C. macquartii Rondani

4. Femora entirely orange................................................................................. 5

- Femora extensively black............................................................................... 8

5. Style short and stout, clearly shorter than pedicel............................................................. 6

- Style long and thin, at least as long as pedicel, mostly much longer.............................................. 7

6. Wings top-half infuscated. Antennae entirely black. Distribution: Russia, Altay............... C. exigua sp. nov. (female)

- Wing entirely clear, without infuscation. Antenna, at least scape brownish yellow, pedicel dark brown, basoflagellomere black. Distribution: Tajikistan.................................................... C. ziminae Krivosheina & Kuznetzov

7. Antennae entirely bright orange. Wing with an orange-yellow tinge along entire costa. Pedicel as long as scape. Distribution: Jordan....................................................................... C. scintilla sp. nov. (female)

- Antennae clearly dark, scape somewhat lighter. Wing with orange-yellow tinge confined to top half of membrane. Pedicel distinctly shorter than scape. Distribution: Western Palaearctic............................. C. spinolae Rondani (female)

8. Frons, above antennae, with long hairs against the eyes. Abdomen, tergite 3 with a complete, dull black, transverse band. Distribution: Western Palaearctic....................................................... C. spinolae Rondani (male)

- Frons, above antennae, without hairs. Abdomen, tergite 3 entirely shining or with matt black marks.................... 9

9. Thorax thinly but distinctly dusted greyish over nearly entire surface, sometimes with 2 or 4 distinct longitudinal dust-stripes within the general dusting. Distribution: Western Palaearctic................................... C. aenea (Fabricius)

- Thorax entirely shining with two clear longitudinal dust-stripes medially, ending abruptly between the wing bases. Distribution: Western Palaearctic................................................................... C. aurata (Rossi)