Eristalina

Thompson, F. Christian, 2003, Austalis, a new genus of flower flies (Diptera: Syrphidae) with revisionary notes on related genera, Zootaxa 246, pp. 1-19 : 3-6

Key to the groups of the subtribe Eristalina

1. Anepimeron with triangular portion bare ( Figs. 1, 3­4 )................................................ 6

­ Anepimeron with triangular portion pilose ( Fig. 2 ) ...................................................... 2

2. Postalar pile tuft absent; eye bare, without maculation; wing brown, completely microtrichose; scutellum with marginal sulcus .............................................. Solenaspis

­ Postalar pile tuft present ( Fig. 5 ); eye with maculae; wing hyaline; scutellum without marginal sulcus.............................................................................................................. 3

3. Wing densely and uniformly microtrichose on apical half ..... Eristalinus (Helophilina)

­ Wing bare or sparsely microtrichose............................................................................. 4

4. Metafemur thickened, distinctly arcuate; metatibia strongly compressed and carinate on basoventral 1/3; eye bare or very finely pilose dorsally, with pili no longer than

ommatidial diameter; male metatrochanter with ventral patch of short stiff black setulae ............................................................................................. Eristalinus (Merodonoides) ­ Metafemur at most very slightly thickened, not arcuate; metatibia not carinate nor compressed ventrally; eye usually densely pilose, with pili much longer than omma­ tidial diameter; male metatrochanter simple ................................................................. 5

5. Eye punctate (with spots) ......................................................... Eristalinus (Eristalinus)

­ Eye fasciate and punctate (with bands and bands) ................... Eristalinus (Eristalodes)

6. Katepimeron bare ( Fig. 3 ) ........................................................................................... 13

­ Katepimeron pilose ( Fig. 4 ) .......................................................................................... 7

7. Meron bare posteroventrally, without pile anterior or ventral to metathoracic spiracle ( Fig. 4 ); eye pilose; arista pilose ........................................................................ Eristalis

­ Meron pilose posteroventrally, with pile anterior or ventral to spiracle ....................... 8

8. Eye pilose, at least some pile dorsally, frequently densely pilose; arista bare............ 12

­ Eye usually bare, if with a few distinct pili, then arista pilose...................................... 9

9. Scutellum without apical sulcus; metatibia at most very slightly compressed apically, with apical half not broader than basal half, without dorsal or ventral pile fringes........ ............................................................................................................ Austalis gen. nov.

­ Scutellum with apical sulcus along margin; metatibia strongly compressed on apical half, distinctly broader than basal half, and often with dense dorsal and ventral fringes of dark hairs................................................................................................................. 10

10. Arista bare; wing microtrichose on apical half; precallar depression bare or with at most a few pili mesially; male holoptic ............................................................ Senaspis

­ Arista pilose, with short to moderately long pili; wing at least bare apicoposteriorly; precallar depression with many stiff pili posteriorly................................................... 11

11. Front with strongly rugose area dorsal to antenna; male holoptic ................... Phytomia

­ Front not rugose; male dichoptic ....................................................................... Simoides

12. Face drawn out into a long slender porrect snout.................................. Lycastrirhyncha

­ Face not drawn out into a snout ......................................................................... Palpada

13. Postalar pile tuft present ( Fig. 5 ); eye bare .............................................. Kertesziomyia

­ Postalar pile tuft absent ............................................................................................... 14

14. Eye pilose .................................................................................................................... 20

­ Eye bare....................................................................................................................... 15

15. Wing with a stigmatic crossvein between Sc and R1 apically .................................... 19

­ Wing without stigmatic crossvein ............................................................................... 16

16. Face concave, straight or produced anteroventrally, without a tubercle ..................... 18

­ Face with distinct tubercle........................................................................................... 17

17. Wing hyaline; basoflagellomere large, much longer than metathoracic spiracle; katepisternum discontinuously pilose, with a few ventral pili, broadly bare medially, pilose on dorsal 1/4; plumula greatly reduced, not branched.............................. Digulia

­ Wing brown on anterior half; basoflagellomere small, only about as long as metathoracic spiracle; katepisternum continuously and densely pilose; plumula well developed, multibranched .............................................................................................. Axona

18. Mesonotum unicolorous; vein R4+5 only slightly sinuate; crossvein r­m basal, before middle of discal cell; wing partially bare; male dichoptic; body usually with short thick scale­like pile in addition to long normal pile ....................................... Dissoptera

­ Mesonotum vittate; R4+5 strongly sinuate; crossvein r­m apical, beyond middle of discal cell; wing entirely microtrichose; male holoptic; body without specialized pile ................................................................................................................................. Keda

19. Mesonotum and frequently abdomen with patches of dense subappressed tomentose yellow pile; male metafemur usually not enlarged, never with basolateral tubercle ..... .................................................................................................................... Meromacrus

­ Without tomentose pile; male metafemur enlarged, with basolateral tubercle ............... .................................................................................................... " Senaspis " apophysata

20. Metatibia not compressed nor carinate; wing bare apically ........ Eristalis (Eoseristalis)

­ Metatibia compressed and carinate on basoventral 1/3; wing microtrichose on apical 1/3 or more .................................................................................................................. 21

21. Metafemur greatly swollen; wing dark brown on anteroapical 1/3; cell R2+3 bulbous apically; male dichoptic ......................................................................... Meromacroides

­ Metafemurnotgreatlyswollen;winghyaline;cellR2+3notbulbousapically;maleholoptic " Eristalis " dasyops group

Figures

FIGURES 1 ­ 6. 1 ­ 4. Thoracic pleurae of eristaline flies. Arrows point to the critical areas, 1. Austalis rhina, sp. nov., arrow pointing to bare anterodorsal area of the posterior anepimeron, 2. Eristalinus aeneus (Scopoli), arrow pointing to pilose katepimeron, 3. Eristalis (Eoseristalis) arbustorum (Linnaeus), arrow pointing bare posterior anepimeron and meron, 4. Eristalis (E.) tenax (Linnaeus), arrow pointing to bare posterior anepimeron, but pilose katepimeron; 5. Thorax, dorsal view, Eristalinus aeneus (Scopoli), arrow pointing to postalar pile turf; 6. Male genitalia, lateral view, Austalis rhina, sp. nov. Figures 1 ­ 5 are from Thompson & Rotheray (1998).