A new species of Aegus Macleay, 1819 (Coleoptera: Lucanidae: Lucaninae: Aegini) from Thailand with checklist of the genus species from the country Author Pathomwattananurak, Wuttipon 1051 / 38 Wiang, Mueang Dist., Chiang Rai Province, 57000, Thailand Author Jiaranaisakul, Kawin Rabbit in the Moon Foundation, 399, Village No. 3, Suan Phueng, Ratchaburi, 70180, Thailand text Zootaxa 2024 2024-05-21 5453 3 341 358 http://dx.doi.org/10.11646/zootaxa.5360.3.8 journal article 10.11646/zootaxa.5453.3.2 1175-5326 11234118 285FAECF-D307-48F5-9FA1-DE6320EA0F7C Aegus acuminatus ( Fabricius, 1801 ) ( Figs. 12–14 , 17 , 21 , 27–28 , 33 ) Lucanus acuminatus Fabricius, 1801: 251 . Type locality: Sumatra . Schönherr 1817: 325; Hope 1837: 78 ; Hope & Westwood 1845: 6 . Lucanus cornutus Thunberg, 1806: 169 . Type locality: Java, Sumatra , Indie Orientali. Schönherr 1817: 325 (as synonym). Aegus obscurus Macleay, 1819: 113 . Type locality: not specified. Burmeister 1847: 399 (as synonym). Dorcus acuminatus : Dejean 1836: 194 ; Burmeister 1847: 399 . Aegus acuminatus : Burmeister 1847: 399 ; Reiche 1853: 82 ; Lacordaire 1855: 30 ; Thomson 1862: 399 ; Parry 1864: 91 ; Parry 1870: 93 ; Gestro 1881: 331 ; Van Roon 1910: 40 ; Benesh 1960: 98 ; Bomans 1974: 178 ; Maes 1990: 17 ; Bomans 1991: 293 ; Mizunuma & Nagai 1994: 281 ; Krajcik 2003: 8 ; Fujita 2010: 319 . Aegus ogivus Deyrolle, 1865: 33 , pl. II, fig. 5. Type locality: Malacca , Peninsula. Parry 1870: 54 ; Gestro 1881: 331 ; Van Roon 1910: 42 ; Bomans 1991: 300 (as synonym); Hutacharoen 2011: 247. Aegus splendidus Nagel, 1928: 288 . Type locality: Borneo. Bomans & Benoit 2007: 7 (as synonym). Aegus machimus Didier & Séguy, 1953: 104 . Type locality: Medan, Sumatra . Bomans 1991: 300 (as synonym). Aegus bawangensis Nagai, 1994: 32 , pl. 118, fig. 501. Type locality: Mt. Bawang, SW Kalimantan . Bomans & Benoit 2007: 7 (as synonym); Fujita 2010: 321 . Aegus acuminatus simeuluensis Nagai, 1994: 32 , pl. 118, fig. 502 (37–39). Type locality: Simeulue Is., Indonesia . Bomans & Benoit 2007: 27 (as synonym); Fujita 2010: 320 . Aegus acuminatus niasicus Nagai, 1994: 32 , pl. 118, fig. 502 (40–41). Type locality: Nias Is., Indonesia . Bomans & Benoit 2007: 27 (as synonym); Fujita 2010: 320 . Aegus acuminatus natuensis Nagai, 1994: 33 , pl. 118, fig. 502 (42–44). Type locality: Natuna Is., Indonesia . Bomans & Benoit 2007:27 (as synonym); Fujita 2010: 320 . Aegus suzumurai Nagai, 1994: 32 , pl. 118, fig. 500 (1–2). Type locality: Natuna Is., Indonesia . Bomans & Benoit 2007:61 (as synonym); Fujita 2010: 330 . Material examined ( 10♂♂ , 6♀♀ ). Thailand : 1♂ ( WPC ), Surat Thani Prov. , Khao Sok , 10.I.2020 , W. Pathomwattananurak leg. ; 5♂♂ , 3♀♀ ( WPC ), Nakhon Si Thammarat Prov. , Thung Song Dist. , Nam Tok , 15.XII.2021 , Aussawa Samudjit leg. ; 1♂ ( WPC ), Trang Prov. , Huai Yod Dist. , 2.XII.2018 , Aussawa Samudjit leg. ; 2♂♂ , 1♀ ( WPC ), Trang Prov. , Huai Yod Dist. , 16.V.2018 , Aussawa Samudjit leg. ; 2♀♀ ( WPC ), Trang Prov. , Huai Yod Dist. , I.2021 , Aussawa Samudjit leg. ; 1♂ ( RBMF ), Prachuap Khiri Khan Prov. , Pran Buri Dist. , Khaojao Subdist. , 27.I.2021 , K. Jiaranaisakul leg. Distribution. Indonesia , Malaysia and Thailand ( Satun , Trang , Nakhon Si Thammarat , Phuket , Surat Thani and Prachuap Khiri Khan Provinces) ( Mizunuma & Nagai 1994 ; Krajcik 2003 ; Fujita 2010 ; Hutacharoen 2011). Remarks. The species was already recorded from Thailand under the name Aegus ogivus Deyrolle, 1865 by Hutacharern (2011) . We reconfirm its distribution in Thailand and give the northernmost distribution record of this species ( Fig. 51 ).