NAT. NAT. HIST. BULL. SIAM Soc. 51(2): 197-223 ，2003 REVIEW OF THE HYDROMETRIDAE (HETEROPTERA) OF THAILAND ，WITH DISTRIBUTION RECORDS Akekawat Vitheepradif ， Robert W. Sitei ， Herbert ZetteP ，and Yang Chang Man 3 ABSTRACT Waterme 鎚町巴rs of 白 egenus Hydrometra (In secta: Heteroptera) are common inhabitants of of lentic systems 釦 d pooled water of lotic systems in Th ailand. Extensive dis 甘ibutional data are are given the for 11 species previously recorded from Th ailand ， and for two additional species reported 合om Th ailand the for flfst time. Further ，由 e female of H. julieni Hungerford 組 d Evans Evans is described and ilI ustrated. Th is paper brings together taxonomic ，biological ，加 d ecological ecological information on the genus in 羽lailand from various sources. Key Key words: Hydrometridae ，Heteroptera ，Thailand ，dis 佐ibution ，aquatic ，Hydrometra 町 TRODUCTION 百le genus Hydrometra (In secta: Heteroptera: Hydrometridae) is cosmopolitan 組 d common throughout Southeast Asia ， and is the only genus in the family recorded 合om Thailand Thailand (CHEN & ZEπ 'E L， 1996). The fauna of In dochina and the westem M a1 ay Ar chipelago was revised by POLHEMUS & POL 田 MUS (1995) and comprises 19 species (SITES (SITES & POLHEMUS ， 2003). The distribution in the Ar chipelago is largely allopatric and POLHEMUS & POLHEMUS (1995) considered certain species of Hydrometra to be functional ecological ecological equivalents ，replacing or excluding each other in different p訂 ts of the area ，due to to restriction to particul 紅 habitats. In百 lailand ，ZE 甘'E L & CHEN (1996) apportioned the eight eight species known at the time into three offive Southeast Asian species groups. Recently ， another another species was reported from the Phetchabun Mountains in north-cen 汀a1 τ'h ailand (VITHEEPRADIT ，2000) 佃 d two new species were described 合om north-centr a1 Th ailand (SITES (SITES & POLHEMUS ， 2003). Given the topographic 組 d hydrologic diversity as well as the elongated elongated longitudin a1 geographic orientation of Th ailand ，it is very likely that more species of of Hydrometra exis t. Presented Presented herein are extensive distributional data on species known from τ'h ailand ， new records of two additional species ， and a description of the female of H. julieni Hungerford Hungerford and Evans. Th us ，if used in conjunction with the taxonomic keys of POLHEMUS 'Enns 'Enns Entomology Museum ，Department of Entomology ， and Center for Agroforestry ，University of Missouri- Columbia ，Missouri 65211 ， USA. 2Natural 2Natural History Museum ，In temational Research In stitute ofEntomology ，Burgring ，7 ，A-1014 Vienna ，Austria 3Ra ff1 es Museum of Biodiversity Research ，Dep 訂 tment of Biological Sciences ，Nationa1 University of Singapore ， 119260 ，Singapore. Received Received 30 April 2003; accepted 15 June 2004. 197 197 198 198 AKEKAWAT VITHEEPRAD 汀， ROBERT W. SlTES， HERBERT ZE 甘 EL ，AND YANG CHANG M 釧 & POLHEMUS (1995) 叩 d ZE 甘 EL & CHEN (1 996) ，this paper brings together the current state state of knowledge of taxonomy ，biology ，ecology ，and distribution of Hydrometra in Th ailand. SPECIMEN REPOSITORIES BPBM: Bishop Museum ，Honolulu ，Hawaii ，USA. CAS: Califomia Academy of Sciences ，Califomia ，US A. CCB: F. Cherot Collection ， Systamatique et Ecologie An imales ，Universite Libre de Bruxelles ，Brussels ， Belgium. CFF: Franco Faraci Collection ，Bardolino ， It aly. CMUT: Chiang Mai University ， Faculty of Sciences ，Department of Biology ，Chiang Mai ，Th ailand. CNTN: Nico Nieser Collection ，Tiel ，The Netherlands. CSS: William D. Shepard Collection ，Sacramento ，Califomia ，US A. CUL: Wolfgang G. Ullrich Collection ，Lubeck ，Germany. JTPC: John T. Polhemus Collection ，Englewood ，Colorado ，US A. KKUA: Kh on Kaen University ， Faculty of Agriculture ， Department ofEntomology ，臥 on Kaen ，Th ailand. MNHG: Museum d'Histoire Naturelle ，Gen 色ve ，Switzerland. NHMA: Natural History Museum ，Aarhus ，Denmark. NHMW: Natural History Museum ，Vienna ，Austria. NSM: National Science Museum ，Pathum Thani ，Th ailand. PPCC: Ping-Ping Chen Collection ，Tiel ，Th e Netherlands. RFD: 百1ai Royal For' 田町y Department ，Bangkok ，Th ailand. UMC: Enns Entomology Museum ，Universi 旬 of Missouri-Columbia ，USA. USNM: National Museum of Natural History ， Smithsonian In stitution ，D.C. ，US A. ZMUC: Th e Zoological Museum ，University of Cope 凶1agen ，Denmark. ZRC: 官 1e Zoological Reference Collection ，Raffles Museum for Biodiversity Research ， National National University of Singapore ，Singapore. LOCALITY ABBREVIA TIONS NP: National Park. WS: Wildlife Sanctuary. WMS: Wildlife Management Station. WRSC: Wildlife Research Station Center. Many of the collecting localities (L-numbers) given in the collection records for AV and RWS may be viewed by accessing a Locality Im age Database linked to the Enns Entomology Museum intemet site. Representative specimens of all species currently listed as as being housed at UMC will be transferred to ，and deposited in ，NSM and RFD. All diagnoses diagnoses are intended to distinguish among only species known 企om Th ailand. Identification of of females generally is not reliable without the association with male spec 回1ens. Coordinates were obtained via GPS (map datum WGS 84). REVIEW OF THE HYDRO ル1E TRIDAE (HETEROPTERA) 199 Hydrometra Hydrometra akekawati Sites and Polhemus (Fig. (Fig. 1) Hydrometra Hydrometra akekawati Sites and Polhemus 2003: 14 0- 142. Diagnosis.__": τbis species can be dist 泊guished by 佃 anteclypeus 伽 t is elonga 飽， conical ，slightly convex-sided ，and narrowly-rounded apically. 百le pronotum is heavily punctate punctate on 出e pro- and mesothoracic pleura. Males have a pair of posterio r1 y-directed ， black-tipped ，sclerotized prongs near the anterior margin of sternite Vll .τbis species resembles resembles H. chaweewanae Sites and Polhemus and H. cracens Polhemus and Polhemus ， however the anteclypeus of H. chaweewanae has an acuminate process at 出e apex and the anteclypeus anteclypeus of H. cracens is parallel-sided. 百le female apical process of tergite VIII is slightly slightly angled upward 血roughout its length. Discussion. ー官le type locality was a quadrate ，apparently an 伽'O pogenic pond adjacent to to a small g部 station. Th e pond was situated between a highway and cornfield. Th e perimeter perimeter of the pond was heavily vegetated with emergent and submergent vegetation. Th is species was collected with five congeners: H. annamana Hungerford and Evans ， H. H. carinata Polhemus and Polhemus ， H. chaweewanae ， H. greeni Kirkaldy ，組 d H. orientalis Lundblad. Lundblad. Since the species is known only from the type locality ， its distribution in 百lailand cannot cannot be assessed until additional records are available. Mate rIll I examined. -C HAIYAPHUM Prov.: Amphur Kh on San ， Tumbon Heuy Yang ，7 .4 km S of intersection intersection Hwy 2055 x 12 ， on Hwy 2055 ，vegetated pond ，2-VII-1998 ，Vitheepradit & Sawangsak ，L ・228 (4 (4 males ，7 females; UMC ，RFD ，ITP C). Hydrometra Hydrometra annamana Hungerford and Evans (Fig. (Fig. 1) Hydrometra Hydrometra annamana Hungerford and Evans 1934: 68. Diagnosis.__": 百 is species can be distinguished by an anteclypeus that is broadly 凶 angul 訂 to obtusely angled anterio r1 y. Males have a pair of small ，tightly-clustered ， black setae setae at 出e midlength of stemite Vll. Females have 血 e upwardly-directed terminal process of of tergum VIII at least as long as 白紙 part of the tergum anterior to it. This species resembles resembles H. maidli Hungerford and Evans ，however males of the latter species have a pair of of large patches of brown setae on the pos 旬rior half of stemite VII. Discussion. ー百is species has been recorded from China (Hong Kong) ，Japan ，Laos ， Taiwan ，Thailand ，and Vietnam (POLHEMUS & POLHEMUS ，1995) 組d occurs in a wide variety variety of aquatic habitats. In Th ailand ，this species was previously collected in Chiang Mai and Bangkok provinces (POLHEMUS & POLHEMUS ， 1995). Herein ，we add records from Chaiyaphum ，Chanthaburi ，Kamphaeng Phet ，Kanchanaburi ，Khon Kaen ，Nakhon Ratchasima ，Sakon Nakhon ，Satun ，and Songkhla provinces. Th ese new records ful the gap between between the p問 viously disjunct distribution records. Moreover ， the record from Satun Pr ovince is the southemmost known limit of H. annamana in Southeast Asia. Th is species apparently apparently occurs widely in both lotic and lentic habitats at low elevations inτbailand. In north-central north-central Th ailand ， H. annamana was collected in the Phetchabun Mountains at the 200 .AKEKAWAT V ITHEEPRADIT ，R DBER T w .SIT ES ，HERB ERT ZETTEL ，AND Y ANG CH ANG M AN ム Hydrometra akekaw 仰 !and H. H. annamana .. .. Hydrometra annamana ..:::" ..:::" F igu re j . D istri but ion of H yd rome t/ 百 akek Gl REVIEW OF THE HYDROMETRIDAE (HETERO P'四 RA) 201 margins 'O fa p 'O nd in ass 'O ciati 'O n with vegetati 'O n ，where it c'O・'O ccurred with H. akekawati ， H. H. carinata ， H. chaweewanae ， H. greeni ，and H. orientalis (VπHEEPRAD 汀， 2000). Material Material examined. -C HAIYAPHUM Pro V.: Amphur Kh on San ，Tumbon Heuy Y 佃 g， 7.4 km S of intersection intersection Hwy 2055 x 12 ， on Hwy 2055 ，vegetated pond ，2 ・Vll ・1998 ，Vith 閃 pradit & Sawangsak ，L ・228 (1 (1 male ， 2 females; UMC); Arn phur Kh on San ，Tumbon Heuy Yang ，vegetated pond n伺 r rice field ，2・ vll ・1998 ， Vitheepradit Vitheepradit & Sawangsak ， L-229 (1 male ，2 females; UMC); Phu Kh ieo WS ，tributary to Nam Prom ， 13-ill-1994 ，W.D. Shepard ， 1038 (1 female; CSS); CHANτ 宜AB URl Pro v.: Namtok Phlew NP ，Nam Tok Phlew waterfall ，14- 1-1997 ，H 且 Tan ，古田 .9705 (1 male; ZRC); CHIANG MAI Pr ov.: Chiang Mai ，口語 ang Mai Zo o， Water Water Reservoir ，IO-IX ・1995 ， H. Ze ttel ， 11 (1 male; NH MW); Chiang Mai ，12 ・1・1980 ， F. Faraci (1 female; CFF); KAMPHAENG PHET Pro V.: s回 amne 釘Kh ong N 釘n Lai Waterfall ，13-IX ・1998 ，T.B.Lim ，YCM228 (1 female; ZR C); KANCHANABURI Pr ov.: Amphur Mu 佃 g，Heuy Lam Ta Pem ，14 ・08'N 99 ・22'E ， 48 m ，15-IV ・2∞2， Vi 由民pradit & Kirawanich ，L ・344 (1 female; UMC); KHON KAEN Pr ov.: Kh on Kaen University ，lakes ， 19 ・H ・1994 ，W.D.