The fast-running flies (Diptera, Hybotidae, Tachydromiinae) of Singapore and adjacent regions Author Grootaert, Patrick Author Shamshev, Igor V. text European Journal of Taxonomy 2012 2012-01-06 5 1 162 journal article 10.5852/ejt.2012.5 e809cd3a-36bb-413d-9f19-70837d7db34b 3715167 B69F002A-C1A0-439D-9477-62BFA87DEAD7 Chersodromia nigripennis Shamshev & Grootaert, 2005 Figs 58-62 Chersodromia nigripennis Shamshev & Grootaert, 2005c: 3 . Diagnosis Rather small species (about 2.0 mm) with 2 pairs of vertical bristles; very narrow face; black antennae; conical postpedicel with apical stylus; brownish palpi, halters and legs, and usually deeply infuscate wings. Material examined SINGAPORE : 1 ♂ , Chek Jawa, 12 September 2005 , mangrove, sweeping (reg. 25343, leg. P.G.); 2 ♀♀ , Chek Jawa, 15 December 2005 , mangrove, sweeping (reg. 25452, leg. P.G.); 2 ♂♂ , 2 ♀♀ , Sungei Buloh (SBWR01), 19 May 2009 , mangrove, Mal. (reg. 29073, leg. P.G.). Distribution Singapore . Seasonal occurrence and habitat On beaches in front of mangroves; with flight records in March, May, September, and November- December (most records). Figs 58-62. Chersodromia nigripennis Shamshev & Grootaert, 2005 , ♂. 58 . palpus, lateral view. 59 . antenna, lateral view. 60 . right epandrial lamella, lateral view. 61 . epandrium and cerci, dorsal view. 62 . left surstylus, lateral view. (after Shamshev & Grootaert 2005 ). Remarks This species is likely to show dark-winged (most common) and pale-winged forms. We supposed that the dark wings are a local homochromatic adaptation as a camouflage on a black background. The paler specimens might have an advantage on the white sandy patches ( Shamshev & Grootaert 2005c ). Chersodromia nigripennis appears to have an intermediate position between the C. incana and C. cursitans groups ( sensu Chvála, 1977 ).