Notes on Megalotomus Fieber, 1860 in the Palaearctic Region (Hemiptera, Heteroptera, Alydidae) Author Yi, Wenbo Department of Biology, Xinzhou Teachers University, Xinzhou 034000, China Author Wang, Shijun School of Plant Protection, Shanxi Agriculture University, Taigu 030800, China Author Zhang, Hufang Department of Biology, Xinzhou Teachers University, Xinzhou 034000, China Author Bu, Wenjun Institute of Entomology, Nankai University, Tianjin 300071, China text Zootaxa 2022 2022-04-20 5128 2 211 224 journal article 55848 10.11646/zootaxa.5128.2.3 7b070c6a-fd3e-40b6-b8b2-f38d09aa9360 1175-5326 6479798 64977C0C-5A79-47C5-96BF-7895D1FFBC7B Megalotomus ornaticeps ( Stål, 1858 ) ( Figs. 11–13 , 29–31 , 44 ) Alydus ornaticeps Stål, 1858: 178 . Syntypes : ♂ , ♀ , Russia (East Siberia), Irkutsk ; NHRS. Alydus sareptanus Baerensprung, 1859: 334 (syn. Stål, 1872: 54 ). Lectotype ( Deckert, 2001: 406 ): ♂ , Russia ( Syntype ), Sarepta [= Krasnoarmeysk nr Volgograd ]; ZMHB. Megalotomus ornaticeps ( Stål, 1858 ) : Hsiao, 1977: 276–277 ; Nonnaizab et al ., 1986: 305–313 ; Liu & Liu, 1998: 41–43 ; Nonnaizab, 1999: 76–77 ; Dolling, 2006: 38 ; Dursun et al. , 2010: 487–496 ; Yildirim et al ., 2011: 1628 . Diagnosis. This species is recognized within the genus Megalotomus by a combination of the following characters: body size relatively moderate, 13.5–15.0 mm in length, brownish, with conspicuous, light-coloured spots on the forewings, somewhat like a split arrow; posterior angle of pronotum acute, but not ending in a sharp spine; surcapsular spines of the genital capsule slightly curving, weakly S-shaped, without any sub-structure; parameres elongate, strongly curving at midpoint, with apex palmate, and 5–8 small spines along periphery. Material examined. Type materials. Syntype , 1 ♂ , Russia ( East Siberia ), Irkutsk ; NHRS-GULI 000001716; ( NHRS ) (other information unknown) . FIGURES 8–16. Megalotomus spp. , dorsal, lateral and ventral views. Figs. 8–10, M. junceus ( Scopoli, 1763 ) , female (China: Liaoning Province, Beipiao City); Figs. 11–13, M. ornaticeps ( Stål, 1858 ) , male (China: Xinjiang Autonomous Region, Tacheng County, Yemenle Town); Figs. 14–16, M. castaneus Reuter, 1888 , female (China: Hebei Province, Xiaowutaishan); Figs. 8, 11, 14, dorsal views; Figs. 9, 12, 15, lateral views; Figs. 10, 13, 16, ventral views. Scale in mm. Other specimens. China : Xinjiang Uygur Autonomous Region : 1 ♀ , Tacheng County , Yemenle Town , 25- July-2002 , Weibing Zhu leg. ; 4 ♀♀ , same locality, 26-July-2002 , Weibing Zhu leg. ; 7 ♂♂ , same locality, 24-July-2002 , Weibing Zhu leg. ; 1 ♂ , same locality, 24-July-2002 , Jun Lv leg. ; 4 ♂♂ , 4 ♀♀ , Yili , Yi’ning Aviation Park , 7-August-2002 , Weibing Zhu leg. ; 1 ♂ , same locality, 12-August-2002 , Weibing Zhu leg. ; 1 ♂ , same locality, 7-August-2002 , Yunling Ke leg. ; 1 ♂ , 3 ♀♀ , same locality, 7-August-2002 , Jun Lv leg. ; 1 ♂ , same locality, 12-August-2002, Jun Lv leg. ; 1 ♀ , Yili Prefecture , Xinyuan County , 8-August-2010 , Yiran Mu , Qiang Mu leg. (All above specimens were housed in NKUM .). Distribution. Asia: Armenia , Azerbaijan , China ( Inner Mongolia , Xinjiang Uygur Autonomous Region), Kazakhstan (Asian part), Georgia , Mongolia , Russia (East Siberia, West Siberia); Europe: Kazakhstan (European part), Russia (South European Territory), Ukraine . Remarks. This species most closely resembles M. acutulus in body color, surface, and vestiture, and the posterolateral angles of the pronotum. The two species can be separated from each other by the following differences: M. ornaticeps is relatively larger than M. acutulus , the light-colored spots on the forewings are larger and more conspicuous in M. ornaticeps than in M. acutulus , and the genital capsule and parameres are also different from each other.