The genus Metrocoris Mayr, 1865 (Gerromorpha: Gerridae) in Vietnam, with descriptions of five new species Author A. D., Tran Author Polhemus, D. A. text Raffles Bulletin of Zoology 2017 2017-05-24 65 109 149 journal article 6572 10.5281/zenodo.4502634 fde5f083-514d-400b-b886-e792390afd86 2345-7600 4502634 E9197A2F-EE46-4E5E-93C5-37E4CEC1A240 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 ) . Figs. 80–90. Morphological features of Metrocoris species. 80–83: M. ciliatus , macropterous male. 80: right fore leg. 81, 82: left paramere, two different views. 83: endosomal sclerites, lateral view. 84, 85: M. inthanon . 84: right fore leg of male. 85: apex of abdomen, female, ventral view. 86–90: M. triangulatus . 86–89: male holotype. 86: A, right fore leg. 87: left paramere. 88, 89: endosomal sclerites, lateral and dorsal views. 90: abdomen of female, ventral view (80, 84, 86 same scale; 81–83 same scale; 85, 90 same scale). Figs. 91–93. Metrocoris inthanon , variations of male parameres. 91: specimen from Vietnam, Nghe An Prov., Pu Mat Nature Reserve (CL 4388). 92: specimen from Laos, Vientiane Prov., Ban Van Heue. 93: specimen from Vietnam, Gia Lai Prov., 60 km N. of An Khe (CL 4309). 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 ).