Guide To The Aquatic Heteroptera Of Singapore And Peninsular Malaysia. Ix. Infraorder Nepomorpha, Families Ochteridae And Gelastocoridae Author Polhemus, Dan A. Author Polhemus, John T. text Raffles Bulletin of Zoology 2012 2012-08-31 60 2 343 359 journal article 10.5281/zenodo.5348151 2345-7600 5348151 Ochterus noualhieri Baehr ( Figs. 22 , 26–28 , 33 ) Ochterus noualhieri Baehr, 1990a: 91 Material examined . — INDONESIA , Sulawesi Utara Prov. : 12 males , 20 females , Celebes , Tondano River tributary, S. of Airmadidi , 20 Sep.1985 , CL 2127, coll. D. A. & J. T . Polhemus ( JTPC ) ; 7 males , 15 females , 1 immature , Kab. Bolaang Mongondow , Kec. Modayag , forest streamlet above Lake Mooat , 1100 m ., 0°44'N , 124°27'E , 10 Sep.1985 , CL 2114, coll. D. A. & J. T . Polhemus ( JTPC ) . Figs. 26–28. O . noualhieri Baehr , male, structural details, specimen from Indonesia, Celebes, CL 2127. 26, Male right paramere. 27, Superior appendage of right paramere. 28, Medial process of pygophore. Figs. 29–34. Ochterus species , colour photographs of head, anterior view, showing pattern of striations on frons. 29, O . marginatus (Latreille) , female, specimen from Vietnam, Cao Bang Prov., CL 4368. 30, O . thienemanni Jaczewski , female, specimen from Indonesia, Bali Prov., CL 2170. 31, O . signatus , new species , female, specimen from Vietnam, Lam Dong Prov., CL3085. 32, O . pseudomarginatus , new species , female, specimen from Malaysia, Perak, CL 2078. 33, O . noualhieri Baehr , female, specimen from Indonesia, Sulawesi Utara Prov., CL 2114. 34, O . singaporensis , new species , male, specimen from Singapore, Bukit Timah. apex deeply incised ( Figs. 26, 27 ); male proctiger with medial process angulate ( Fig. 28 ). Distribution . — Originally described from two specimens taken on Gunung Gede, in western Java, and subsequently reported by Nieser & Chen (1999) from Sulawesi, and possibly Bali (the latter record based on a female specimen only). Because of this geographic proximity, and its broad distribution in the Malay Archipelago, this species may potentially be found in Singapore or Malaysia , and is included in the current regional treatment. Discussion . — In his description of this species, Baehr (1990a) noted that O . noualheieri is similar to O . thienemanni , but differs in having the shaft of the male right paramere widened in the middle, and the appendages less assymmetrical and more tapered at their apices (compare Figs. 23, 24 and 26, 27 ). This species is also small in comparison to others in the region, with the body length of 4.20 mm or less in both sexes, and the ground colour is more reddish brown (compare Figs. 21 and 22 ).