A review of the genus Amphicnemis in Peninsular Malaysia and Singapore, with descriptions of two new species (Odonata: Zygoptera: Coenagrionidae) Author Dow, Rory A. Author Choong, Chee Yen Author Ng, Yong Foo text Zootaxa 2010 2605 45 55 journal article 10.5281/zenodo.197652 46ecee1b-0146-4ad5-9579-6a2f245c6873 1175-5326 197652 Amphicnemis gracilis Krüger, 1898 ( Figs. 5 , 8 , 11 , 20 , 24 ) Amphicnemis gracilis Krüger 1898 : 121 –123 (original description, Sumatra); — Laidlaw 1913 : 74 (brief characterisation); — Lieftinck 1935 : 10 (records from Sumatra); — Lieftinck 1940 : 365 (♂ key), 367 (Ψ key), 372– 373 (discussion), pl. 15, fig. 4, (♂, Ψ prothorax), pl. 16, fig. 2 (♂ appendages); — Lieftinck 1954 : 66 (distribution); — van Tol 1992 : 114 (index to references to this species in Lieftinck’s publications); — Murphy 1997 : 338 , 341– 342 ( Singapore ); — Hämäläinen 2000 : 54 (Pahang); — Orr 2005 : 9 , 41 (brief description and illustration of ♂); — Kitagawa & Katatani 2007 : 30 (Johor); — Norma-Rashid et al. 2008 : 4 , 14 ( Singapore ). FIGURES 7–8. Male posterior pronotal lobe, lateral view: (7) A. bebar holotype male; (8) A. gracilis (Sg. Bebar) . Material. Indonesia , east Sumatra (all in RMNH ): 6 ɗɗ, 18 ΨΨ, Palembang, 14–24 xi 1937 , leg. L. Coomans de Ruiter; ɗ, Ψ, same area, 14–XI–1937 , leg. J.J. van der Starre; Ψ, same area, 1 iv 1938 , collectors name illegible; ɗ, Riouw Residency, Inderagiri, 4 iv 1939 , leg. P. Buwaldi. Malaysia (in RMNH unless otherwise noted): 3 ɗɗ, 3 ΨΨ, Johor, Panti Forest Reserve, swamp forest, 5 viii 2006 , leg. C.Y. Choong, coll. Choong; ɗ, 7 ΨΨ, Pahang, Krau Wildlife Reserve, Kuala Lompok, 22–27 xi 1996 , leg. M. Hämäläinen & H. Olsvik; Ψ, same location, 40 m , 28–30 xi 1998 , leg. M. Hämäläinen; Ψ, Pahang, 65 km south-west of Kuantan, southern part of Lake Chini, at small forest stream, 16 vii 2002 , leg. V.J. Kalkman; Ψ, same data but 18 vii 2002 ; 7 ɗɗ, 2 ΨΨ, Malaysia , Pahang, Sg Bebar , highly disturbed swamp forest, 20 ix 2009 , leg. R.A. Dow, coll. Dow (one in ethanol in RMNH ); 2 ɗɗ, 2 ΨΨ, same area, 21 ix 2009 , leg. R.A. Dow, coll. Dow; 2 ΨΨ, same area and date, leg. C.Y. Choong, coll. Choong; 3 ɗɗ, 1 Ψ, Perak, Pangkor Island, swamp forest, 7 v 2009 , leg. C.Y. Choong, coll. Choong; Ψ, Perak, Hutan Simpan [Forest Reserve], stream 9.9 km south of Redang Panjang, 200 m , 19 vii 1997 , leg. T. Donnelly. Remarks. Males from Sumatra have the end of the upper branch of the cercus slightly more slender as seen in lateral view, and more deeply excavated interiorly, compared with those from Peninsular Malaysia . Both sexes are slightly smaller in Peninsular Malaysia than Sumatran examples. The genital valves of A. gracilis are similar to those of A. bebar ( Fig. 15 ).