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 nigrofascioides Chen & Nieser, 1993 ( Figs. 16, 17 , 38 , 77–79 ) Metrocoris nigrofascioides Chen & Nieser, 1993: 34–35 , Figs. 90 , 97 , 105 ( type locality: Fang, Chiang Mai , Thailand ); Zettel & Chen, 1996: 152 , 177 (records from Vietnam ). Material examined. VIETNAM : Thanh Hoa Prov. : 1 male (apt) , 1 male , 1 female (mpt), Ben En N’Park , Nhu Xuan , Son Binh , Khe Cay Khe stream, site 1, coll. Pham T.D. , 01 March 2013 , BE1304 ( ZMHU ) . Quang Binh Prov. : 1 male (apt), Phong Nha , upstream of Thac Xoi waterfall, coll. Tran A.D. , 15 July 2004 , DY0407 ( ZRC ) ; 4 males , 2 females (apt), Phong Nha , a stream 1 km behind Forest Ranger station 4, coll. Tran A.D. , 16 July 2004 , DY0409 ( ZMHU ) . Da Nang Prov. : 4 males (apt), Ba Na - Nui Chua foothills, Suoi Lanh , coll. Tran A.D. & Tan H.H. , 01 March 2005 , THH05-25 ( ZRC ) . Kon Tum Prov. : 1 male , 3 females (apt.), stream 2 km inside Chu Mom Ray Nature Reserve , 635 m asl , 14°25′55″N , 107°42′46″E , water temp. 21°C, 4 March 2001 , CL 4277, coll. J.T. Polhemus & P. Nguyen ( USNM ) ; 2 females (apt), stream 63 km NE. of Kontum on Hwy. 24, 1050 m asl, 14°36′14″N , 108°18′22″E , water temp. 20.5°C, 6 March 2001 , CL 4281, coll. J.T. Polhemus & P. Nguyen ( USNM , BPBM ) ; 4 males , 6 females (apt), 1 male , 3 females (mpt), stream in dry forest hills 29 km NE. of Kontum on Hwy. 24, 565 m asl , 14°27′01″N , 108°09′12″E , water temp. 20.5°C, 19 March 2001 , CL 4284, coll. D.A. Polhemus , J.T. Polhemus & P. Nguyen ( USNM ) ; 1 female (apt), 1–4 m trib. of Ngoc Mi River , ca. 20 km NE. of Ngoc Linh , 980 m asl , 10 Sept. 1998 , coll. B. Hubley , D.C. Currie & M. Tseng , ROM 982314, secondary tropical forest, 15°08′23″N , 107°54′40″E ( USNM ) . Gia Lai Prov. : 1 male , 3 females (mpt), 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 ) ; 5 males , 1 female (apt), 1 female (mpt), Nuoc Stream , 47 km N. of An Khe , 580 m asl , 14°14′17″N , 108°36′17″E , water temp. 24°C, 23 March 2001 , CL 4312, coll. D.A. Polhemus , J.T. Polhemus & P. Nguyen ( USNM , BPBM ) . Binh Dinh Prov. : 7 males , 8 females (apt) , 1 female (mpt), rocky stream on E. side of An Khe Pass , 19 km E. of An Khe on Hwy. 19, 115– 200 m asl , 13°58′50″N , 108°47′14″E , water temp. 24°C, 12 March 2001 , CL 4291, coll. J.T. Polhemus & P. Nguyen ( USNM ) ; 1 male , 3 females (apt), waterfall on E. side of An Khe Pass , 19 km E. of An Khe on Hwy. 19, 170 m asl , 13°58′23″N , 108°46′48″E , water temp. 24°C, 12 March 2001 , CL 4292, coll. J.T. Polhemus & P. Nguyen ( USNM , BPBM ) . Phu Yen Prov. : 1 male (apt), stream in granite hills on N. side of Ca Pass , 29 km S. of Tuy Hoa on Hwy. 1, 60 m asl, 12°53′05″N , 109°23′38″E , water temp. 24°C, 25 March 2001 , CL 4316, coll. D.A. Polhemus , J.T. Polhemus & P. Nguyen ( USNM ) . Lam Dong Prov. : 1 male (apt), Di Linh , 18 km S. of Bao Loc , 600 m asl , coll. Vásárhelyi , 14 October 1988 , No. 283 ( MTMB ) . Dong Nai Prov. : 2 males 1 female (apt), Vinh Cuu , Vinh An , Suoi Rang waterfall, coll. Tran A.D. , 10 May 2003 , TAD0315b ( ZRC ) . Kien Giang Prov. , Phu Quoc Island : 1 male (apt), 1 male (mpt), Da Ban stream & waterfall, coll. Tran A.D. & D. Yeo , 29 November 2010 , TAD1020 ( ZMHU ) ; 2 males , 1 female (apt), 3 males , 3 females (mpt), Tranh stream (middle section & waterfall), coll. Tran A.D. , 30 November 2010 , TAD1022 ( ZMHU ) . LAOS : Khammouan Prov. : 3 males , 1 female (apt) , 1 male , 1 female (mpt), Ban Khoun Ngeun env., N18°07′E104°29′, alt. 250 m asl , coll. E. Jendek & P. Patcholátko , 4–16, 25–30 November 2000 ( NHMW ) . Saravan Prov.: 1 male , 1 female (apt), Tat Lo Waterfall & Resort , 370 m asl , coll. Schwendinger , 29 December 1996 ( NHMW ) . Vientiane Prov. : 1 male , 6 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 , 31 August 1967 , coll. J.L. Gressit et al. ( BPBM ) . Luang Prabang Prov. : 2 females (apt) , 2 males , 5 females (mpt), Huay La stream, (trib. to Nam Xeuang river ), NE. of Ban Pha on road to Pak Xeng , 305 m asl , 20°03′38″N , 102°19′45″E , water temp. 26°C, 6 December 2015 , 1000–1200 hrs., CL 6026, coll. D.A. Polhemus ( BPBM ) ; 5 males , 5 females (apt), 1 male , 2 females (mpt), Huay Sokor stream, (trib. to Nam Xeuang river ), NE. of Ban Pha on road to Pak Xeng , 350 m asl , 20°03′11″N , 102°21′43″E , water temp. 25°C, 6 December 2015 , 1330–1500 hrs., CL 6027, coll. D.A. Polhemus ( BPBM ) ; 1 male (apt), Nam Bor River , 1.3 km SW. of Ban Phuong Pao village , 365 m asl [ 1200 ft ], 19°57′02″N , 102°28′33″E , water temp. 21°C, 7 December 2015 , 0930–1015 hrs., CL 6028, coll. D.A. Polhemus ( BPBM ) ; 1 female (apt), 1 male , 1 female (mpt), small forest tributary to Nam Bor River , 1.4 km SW. of Ban Phuong Pao village , 395 m asl , 19°56′59″N , 102°28′29″E , water temp. 21°C, 7 December 2015 , 1030–1100 hrs., CL 6029, coll. D.A. Polhemus ( BPBM ) ; 3 males , 2 females (apt), 4 males , 1 female (mpt), rocky stream and small clear tributary at Ban Kokvane village , upstream of bridge, 320 m asl [ 1050 ft ], 19°57′07″N , 102°17′36″E , water temp. 23.5°C, 7 December 2015 , 1315–1415 hrs., CL 6031, coll. D.A. Polhemus ( BPBM ) ; 2 males , 2 females (apt), 1 male (mpt), rocky stream at Tad Thang waterfall area,, 7 km S. of Luang Prabang , 410–440 m asl [ 1350–1450 ft ], 19°50′15″N , 102°07′53″E , water temp. 21°C, 8 December 2015 , 0900– 1045 hrs., CL 6032, coll. D.A. Polhemus ( BPBM ) . CAMBODIA : Koh Kong Prov. : 4 males , 1 female (apt) , 2 females (mpt), Cardamom Mountains , shaded forest streamlet on road to Tatai Dam overlook, 420 m asl , 11°36′02″N , 103°13′02″E , water temp. 26°C, 30 August 2015 , CL 6016, coll. D.A. Polhemus ( BPBM , USNM ) ; 3 males , 1 female (mpt), Cardamom Mountains , cascading stream in sandstone bed on road to Tatai Dam overlook, 420 m asl , 11°35′47″N , 103°14′48″E , water temp. 26°C, 30 August 2015 , CL 6017, coll. D.A. Polhemus ( BPBM , USNM ) ; 2 males , 2 female (apt), Cardamom Mountains , Toeuk Noeng River , 165 m asl , 11°37′33″N , 103°28′51″E , water temp. 26°C, 31 August 2015 , CL 6019, coll. D.A. Polhemus ( BPBM , USNM ) ; 1 male , 4 female (apt), Cardamom Mountains , outflow from ponded stream on road from Koh Kong to Pursat , 540 m asl , 12°00′58″N , 103°10′47″E , water temp. 24.5°C, 1 September 2015 , CL 6023, coll. D.A. Polhemus ( BPBM , USNM ) . THAILAND : Chiang Mai Prov. : 1 male (mpt), N. Thailand , 78 km from Chiang Mai , coll. Y.Y. Goh , 12 June 1998 , GYY079 ( ZRC ) ; 3 males , 4 females (apt), 1 male , 1 female (mpt), NW. Chiang Mai , stream off Pai River , coll. C.M. Yang & T.B. Lim , 08 September 1998 , YCM207 ( ZRC ) ; 2 males , 2 females (apt), 1 male , 1 female (mpt), W. Mae Rim , Mae Sa N’Park , Mae Sa Falls , coll. H. Zettel (2), 30–31 October 1995 ( NHMW ) . Kamphaeng Phet Prov. : 1 male (mpt), central Thailand , Kamphaeng Phet , side stream to waterfall, coll. C.M. Yang & T.B. Lim , 12 September 1998 , YCM223 ( ZRC ) ; 1 female (apt), central Thailand , rocky stream, coll. C.M. Yang & T.B. Lim , 12 September 1998 , YCM222A ( ZRC ) . Diagnosis. Male: fore femur incrassate (ratio length/width variable, about 3.63–4.61), ventral surface indented subapically, with pointed proximal edge and a large sub-apical tooth, inner surface of fore tibia with broad indentation basally (not obvious in males with more slender fore femur) ( Fig. 77 ). Male genitalia moderate in size: pygophore sub-ovate; proctiger elongate; paramere falciform, apex blunt ( Fig. 38 ); endosoma as in Chen & Nieser (1993 : Fig. 105 ). Female: inner surface of hind trochanter with long hairs ( Fig. 78 ); sternum 7 large, constricted laterally, posteriorly produced median lobe with parallel lateral margins and round posterior margin, sometimes directed dorsad, completely enclosing genitalia ( Fig. 79 ). Size: apterous males: length 4.31–4.95, width 2.11–2.51; apterous females: length 4.02–4.75, width 2.23–2.52. Remarks. See Remarks for M. acutus . Distribution. Vietnam : Thanh Hoa , Quang Binh , Da Nang , Kon Tum , Gia Lai , Binh Dinh , Phu Yen , Lam Dong , Dong Nai , Phu Quoc ( Fig. 139 ). Extralimital records: Myanmar : Hpungan Sadon, Thailand (northern), Laos (first record), Cambodia (first record).