Metrocoris inthanon Chen & Nieser, 1993 (Figs. 18, 19, 84, 85, 91–93) Metrocoris ciliatus den Boer, 1965: 23–26, Figs. 36, 40, 46 (female paratypes from Laos). Metrocoris inthanon Chen & Nieser, 1993: 57–59, Figs. 154, 162, 170 (type locality: Doi Inthanon, Chiang Mai, Thailand); Zettel & Chen, 1996: 152, 177 (records from Vietnam). Material examined. VIETNAM: Phu Tho Prov.: 1 male, 3 females (apt), Xuan Son N’Park, Kim Thuong, Tan Ong stream, site 3, ca. 4 km from Chin Tang waterfall, coll. Tran A.D. et al., 6 June 2013, TAD1336 (ZMHU); 1 male, 1 female (apt), Xuan Son N’Park, Kim Thuong, Tan Ong stream, site 3, ca. 4 km from Chin Tang waterfall, coll. Tran A.D. et al., 28 August 2013, TAD1342 (ZMHU). Thanh Hoa Prov.: 1 female (apt), Pu Luong Nature Reserve, Ba Thuoc, Co Lung, Ban Khuyn, Khuyn stream, coll. Pham T.D., 18 March 2013, PL1303 (ZMHU). Nghe An Prov.: 1 male, 3 females (apt), Pu Mat N’Park, Khe Kem waterfall & stream, site #1, coll. Ngo Q.H., 20 December 2012, NQH1203 (ZMHU); 1 male (apt), Pu Mat N’Park, Khe Kem stream, site #2, ca. 300 m downstream from waterfall, coll. Ngo Q.H., 20 December 2012, NQH1204 (ZMHU); 1 male, 1 female, Pu Mat N’Park, Khe Kem stream, site #3, coll. Ngo Q.H., 20 December 2012, NQH1205 (ZMHU); 1 male, 1 female (apt), Pu Mat N’Park, Khe Kem stream, site #4, coll. Ngo Q.H., 20 December 2012, NQH1206 (ZMHU); 3 males, 1 female (apt), Pu Mat Nature Reserve, SW. of Con Cuong, Kem waterfall, 400 m asl, vic. 18°58′13″N, 104°48′03″E, water temp. 22°C, 1 April 2000, CL 4385, coll. J.T. Polhemus & P. Nguyen (USNM, BPBM); 4 males, 6 females (apt), Bac stream, nr. Pu Mat Nature Reserve, 200 m asl, vic. 18°59′18″N, 104°50′33″E, water temp. 24°C, 2 April 2000, CL 4388, coll. J.T. Polhemus & P. Nguyen (USNM, BPBM). Ha Tinh Prov.: 1 male, 3 females (apt), 1 female (mpt), Vu Quang N’Park, Song Con, old Sao La station, coll. Tran A.D., 25 April 2003, TAD0307a (ZRC). Quang Binh Prov.: 1 male, 2 females (apt), Phong Nha N’Park, Cha Noi, Khe Khai, coll. Hoang Q.K. & Dinh V.K, 5 August 2002, VNQB0201 (ZRC); 1 male (mpt), Phong Nha N’Park, Khe Gat, Cha Noi, coll. Hoang Q.K. & Dinh V.K., 4 April 2003, VNQB0301 (ZRC); 4 males, 2 females (apt), 1 female (mpt), Phong Nha, Cha Noi, Khe Con Khai stream, coll. Tran A.D., 13 July 2004, DY0402 (ZRC); 1 male (apt), Phong Nha, a stream near Forest Ranger station 37, coll. Tran A.D., 15 July 2004, DY0405 (ZRC); 2 males, 3 females (apt), Phong Nha, Chay stream, coll. Tran A.D., 17 July 2004, DY0410 (ZRC). Gia Lai Prov.: 15 males, 15 females (apt), 40 km NW. An Khe, Buon Luoi, 14°10′N, 108°30′E, 620–750 m asl, coll. Pacholátko & Dembicky, 28 March–12 April 1995 (NHMW, ZRC); 19 males, 20 females (apt), 3 females (mpt), Tral Stream, 60 km N. of An Khe, 700 m asl, 14°20′28″N, 108°34′49″E, water temp. 23.5°C, 22 March 2001, CL 4309, coll. D.A. Polhemus, J.T. Polhemus & P. Nguyen (USNM, BPBM); 2 females (mpt), small stream 2 km N. of Tram Lap along forest road, 19 June 1996, ROM-961066, 14°26′N, 108°33′E, primary rainforest, 900 m asl, coll. B. Hulbey (USNM). Ninh Thuan Prov.: 1 female (apt), Nui Chua N’Park, suoi Lo O, coll. Quang N.V., 26 June 2004, NC-03 (ZRC); 1 female (apt), Nui Chua N’Park, unknown location, coll. Quang N.V., 26 June 2004, NC-15 (ZRC). LAOS: Champasak Prov.: 5 females (apt), Bolavens plateau E. Pakse, 50 km E. Muang Paksong, 700 m asl, coll. Schillhammer (9), 27 May 1996 (NHMW). Vientiane Prov.: 2 males, 3 females (apt), Ban Van Heue, ~ 20 km E. of Phou Khao Khouay park HQ, 1039 m asl, vic. 18°17′44″N, 102°53′48″E, 29 March 1966, coll. J.L. Gressit et al. (BPBM). THAILAND: Mae Hong Son Prov.: 3 males, 2 females (apt), NW. Thailand, waterfall near Mae Sariang, coll. C.M. Yang & T.B. Lim, 11 September 1998, YCM219 (ZRC). Diagnosis. Dorsum with extensive dark markings. Both male and female with dense black setae on all thoracic pleura. Male: fore femur slender, not modified (Fig. 84). Male genitalia moderate in size: tergum 8 with median notch on posterior margin; pygophore sub-ovate; proctiger elongate; paramere curved with distal part slightly broad and apex blunt (Figs. 91–93); endosoma as in Chen & Nieser (1993: 170). Female: sternum 7 large, not constricted laterally, posterior margin slightly produced (Fig. 85).

Published as part of A. D., Tran & Polhemus, D. A., 2017, The genus Metrocoris Mayr, 1865 (Gerromorpha: Gerridae) in Vietnam, with descriptions of five new species, pp. 109-149 in Raffles Bulletin of Zoology 65 on pages 128-130, DOI: 10.5281/zenodo.4502634