Austalis, a new genus of flower flies (Diptera: Syrphidae) with revisionary notes on related genera Author Thompson, F. Christian text Zootaxa 2003 246 1 19 journal article 51307 10.5281/zenodo.156531 86286cd8-4061-40ea-a1ab-52144c811716 1175­5326 156531 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 FIGURES 1­6 . 1­4. 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 1­5 are from Thompson & Rotheray (1998). ­ 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