A New Syndyas Loew, 1857 (Diptera: Hybotidae: Hybotinae) From Mangroves In Singapore, With A Review Of The Oriental And Australasian Species Author Grootaert, Patrick Author Yang, Ding text Raffles Bulletin of Zoology 2009 2009-02-28 57 1 17 24 journal article 10.5281/zenodo.4508192 2345-7600 4508192 KEY TO ORIENTAL AND AUSTRALASIAN SYNDYAS 1 Discal cell shorter than basal cells ...................................... 2 – Discal cell as long as basal cells ......................................... 4 2 Discal cell very short, basal cells nearly 3 times longer. ( Sri Lanka , Papua New Guinea ) .............. S. parvicellulata Bezzi – Discal cell longer ................................................................. 3 3 Basal cells about 1.5 times as long as discal cell. Mesonotum black, without blue shine. Abdomen not elongated ( Indonesia : Krakatau) .............................................. S. brevior de Meijere – Basal cells almost as long as discal cell. Mesonotum black in ground-colour, with a blue shine. Abdomen long and slender ( Indonesia : Krakatau) ........................ S. elongata de Meijere 4 Tarsomeres 1 and 2 of all legs yellow ( Taiwan) .................... ..................................................................... S. orientalis Frey – All tarsomeres black ............................................................ 5 5 Wing clear ( India , Myanmar ) ............. S. vitripennis Brunetti – Wing not clear, but yellowish to brownish tinged ............. 6 6 Wing yellowish tinged, no stigma ( Philippines ) ..................... ......................................................................... S. dapana Frey – Wing brownish tinged, usually with stigma (except S. eumera ) ................................................................................. 7 7 Halter dark yellow, wing brown with dark brown stigma ( China : Zheijang) ....................................... S. sinensis Yang & Yang – Halter black .......................................................................... 8 8 Brown stigma present. Hind femur club-shaped (less distinct in S. nigripes ) ....................................................................... 9 – No stigma present. Hind femur very thickened (thickest near middle) ( Papua New Guinea ) ...................... S. eumera Bezzi 9 Veins R 4+5 and M are straight running parallel toward costa. Hind femur ventrally with a row of bristles (not spiny). ( Indonesia : Ceram) ............................................... S. aterrima de Meijere – Veins R 4+5 and M converging towards wing tip, but turning up just before meeting the costa. Hind femur ventrally with a row of long spiny bristles ......................................................... 10 10 Hind femur strongly swollen (club-shaped). Tip of right epandrial lamella bifurcate, outer lobe bearing broad black bristly hairs ( Singapore ) ............................. S. singaporensis , new species – Hind femur weakly swollen. Tip of right epandrial lamella bifurcate, outer lobe with only ordinary hairs ( North Palaearctic , Oriental China – Guizhou , Hainan ) ........................................ ........................................................... S. nigripes (Zetterstedt)