Syrphidae
Creators: name: Dawah, Hassan A.
name: Abdullah, Mohammed A.
name: Ahmad, Syed Kamran
name: Al-Dhafer, Hathal
name: Turner, James
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Syrphidae

description: Key to the genera of Syrphidae from Saudi Arabia
1 Humerus (postpronotal callus) bare...................................................................... 11
- Humerus partly or completely covered with setulae......................................................... 11
2 Face entirely black.................................................................................... 3
- Face partially or entirely yellow.......................................................................... 4
3 Abdomen very elongated, waisted and slender................................................ Allobaccha Curran
- Abdomen not strikingly waisted, slender only in the male..................................... Melanostoma Schiner
4 Tergite 1 well developed, especially on disc where it is frequently half as long as tergite 2, -always extending well beyond scutellum; sublaterally about three quartes as long as tergite 2; tergites punctate.................................... 5
- Tergite 1 fused to tergite 2, often further tergite fused, eye haired, either on lower part or in vertical lines... Paragus Latreille
5 Pleura with distinct yellow markings. Mesonotum dark in ground colour and witha yellow lateral line.................. 6
- Pleura of a dark ground colour throughout.................................................................. 9
6 Antenna elongate, as long as the head. Abdomen robust, wider than the thorax. Wasp-mimics......... Chrysotoxum Meigen
- Antenna short. Abdomen narrower, especially in males....................................................... 7
7 Membrane of anal lobe of wing and alula covered with microtrichia. Male hind trochanter lacking any projection......... 8
- Wing membrane lacking microtrichia basad of mouth of subcosta in costa though there may be a few scarcely discernible microtrichia on alula. Male hind trochanter ventrally with a downwardly-directed spike that is as long as tibial width................................................................................................. Ischiodon Sack
8 More robust flies. Abdomen in both sexes as wide as or wider than the thorax. male genital capsule small................................................................................................ Allograpta Osten Sacken
- Slender flies. Male abdomen slightly to distinctly waisted and with genital capsule large Sphaerophoria Le Peletier & Serville
9 Eye densely long-haired............................................................................... 10
- Eye bare.......................................................................... Eupeodes Osten Sacken
10 Frons in both sexes seen in profile not to be swollen and projecting above eye. Tergites essentially yellow with an apical black transverse band and with 1 and the base of 2 also black the yellow parts conspicuously pale haird. Postpedicel cone-shaped, twice as long asdeep................................................................. Betasyrphus Matsumura
- Frons in both sexes seen in profile to be swollen and projecting above eye. Tergites dark in grossed colour, 2–4 bearing a pair of curved yellow markings that may be fused medially. Wing membrane largely devoid of microtrichi...... Scaeva Fabricius
11 Apical crossvein of vein M1+2 at mid length recurved towards base of wing......................... Eumerus Meigen
- Apical crossvein not recurved.......................................................................... 12
12 Face deeply concave, the mouth margin medially projecting forward of vibrissal angle. Dorsum of abdomen flat.............................................................................................. Orthonevra Macquart
- Not this combination of characters....................................................................... 13
13 Section of vein R4+5 between inner crossvein and wing apex deeply looped towards hind margin of wing.............. 14
- No such loop present, the vein only slightly curved......................................................... 15
14 Eye either with numerous dark spots distributed over its surface or with five dark vertical lines......... Eristalinus Rondani
- Eye devoid of such markings....................................................... Phytomia Guérin Méneville
15 Postpedicel with a distinct dorsally-situated arista. Hind femur swollen. Small narrow-bodied species................................................................................................ Syritta Le Peletier & Serville
- Postpedicel with a short apically-situated robust arista. Hind femur swollen. A long antennifer present. Postmetacoxal bridge incomplete......................................................................................... 16
16 Abdomen petiolate, second segment at its narrowest part much narrower than first and third segments.................................................................................................... Monoceromyia Shannon
- Abdomen not petiolate, second segment as broad as or broader than the first....................... Ceriana Rafinesque
description: Published as part of Dawah, Hassan A., Abdullah, Mohammed A., Ahmad, Syed Kamran, Al-Dhafer, Hathal & Turner, James, 2020, An overview of the Syrphidae (Diptera) of Saudi Arabia, pp. 1-69 in Zootaxa 4855 (1) on pages 11-12, DOI: 10.11646/zootaxa.4855.1.1, http://zenodo.org/record/4411181