Acisoma panorpoides Rambur, 1842 —Asian Pintail

(Figs. 4 C–D, 5A–C, 6D, 7C, 8C, 10C)

Material. Philippines: 1 male, Mindoro, Mt Halcon, Calapan, vi-1991, R. Müller (RMNH); 1 male, Homonhon, Eastern Samar, Bitaogan, 12-v-1988, R. Müller (RMNH); 1 male, Cebu, Lahug, 19-iii-2001, T. Borromeo (RMNH); 1 male, Dinagat, Surigao del Norte, Loreto, Danao lake, vii-1989, A. Buenafe (RMNH); 2 males, Mindanao, Mt Kalatungan, 06-iii-1996, R.A. Müller (RMNH); 1 male, Palawan, Busuanga Island, Coron, Mabentangen River, 04/ 07-v-1991, T. Borromeo (RMNH); 1 male, Visayas, Samar Island, Oras Municipality, 25/ 31-vii-1992, T. Borromeo (RMNH).— Indonesia: 2 males, Kalimantan, Samarinda, 10-xii-1956, A.M.R. Wegner (RMNH); 1 male, West Java, Bantam, Kasemen, 17-v-1957, A.M.R. Wegner (RMNH); 1 male, Sulawesi, Sidaonta Palu, vi-1937, J.M.A. van Groenendaal (RMNH); 1 male, Pulau Panaitan, 03-vii-1955, collector unknown (RMNH); 1 male, Sumatra, Kuta Cane, Taneh Merah, 23-vi-1972 (RMNH); 1 male, Flores, Mborong, 01-iv-1958, A.M.R. Wegner (RMNH); 1 male, Billiton, Manggar, 18-ii-1936, F.J. Kuiper (RMNH).—Peninsular Malaysia: 1 male, Pahang, Krau Wildlife Sanctuary, Bukit Rengit, 5/ 8-vi-1997, M. Hämäläinen (RMNH).— Thailand: 1 male, Pu Pan NP, Kaengmoddaeng, 18-iv-1996, H. Malicky & P. Chantaramongkol (RMNH); 1 male, Bangkok, Kasetsart, 06/ 08-vi-1984, M. Hämäläinen (RMNH); 1 male, Chaiyaphum, Phu Khieo Wildlife Sanctuary, 09/ 10-vi- 1984, M. Hämäläinen (RMNH).— India: 1 male, Uttar Pradesh, Doon Valley, Kulhal barrage on river Ahsan, 13-x- 1986, M. Hämäläinen (RMNH).— China: 1 male, Guangxi, 7 km SE Guilin, 10-ix-1985, collector unknown (RMNH); 1 male, Fukien, Bohea Hills, 25-vi-1939, T.C. Maa (RMNH); 2 males, Shanghai, 23-vi-1934 and 04-vi- 1936, E. Suenson (RMNH); 1 male, Guangdong, Guangzhou, 18-vii-1990, J. Silber (RMNH).

Male diagnosis. Only representative of the genus in Asia, typical of the group lumped formerly under A. panorpoides by the (a) extensively white labrum, labium, thorax and underside of S3–7; (b) low number of Fw Ax, typically 7 but varies between 6 and 8; (c) 1 cell in Fw triangle, but 2 cells in 6% of examined wings; (d) fairly long Fw Pt, about 11–14% as long as Hw; (e) abdomen that narrows abruptly on S 5 in lateral view, with S6–10 slender (Fig. 7 C); (f) fragmented and frayed white markings on S2–5 and large white lateral spots on S7 (Fig. 7 C); and (g) broad and triangular lobe of hamule (Fig. 8 C). Within this group has the (1) stoutest abdomen, with S6 between 1x and 2x as long as high and a distinct ‘step’ between the ventral borders of S5 and S6 (Fig. 7 C). Latter recalls A. attenboroughi sp. nov. that also only shares the (2) rather slender hook of the hamule (Fig. 8 C); and (3) sublateral black marking concentrated on apical side of S4 (Fig. 7 C); but differs by the (4) totally black ventro-apical carina of S4, although this is partly white in about 15% of cases (Fig. 7 C). Aside from distribution, unique within the genus by the (5) narrow black band across the antefrons, which is only 10–40% as wide as labrum is high (Fig. 4 C–D); (6) labrum with no black or only a very small spot that is typically separated from the base (Fig. 4 C–D); and (7) complete distal Ax in 62% of examined Fw.

Range and ecology. Common at marshy habitats from the Indian subcontinent to Japan, the Philippines and Indonesia.