Megalotomus acutulus Liu & Liu, 1998

(Figs. 20–22, 38–40)

Megalotomus acutulus G.Q. Liu & Q. Liu, 1998: 41 . Holotype: ♂, China (North), Inner Mongolia, Hailar (49.2°N / 119.7°E); NKUM. Dolling, 2006: 38.

Diagnosis. This species is recognized within the genus Megalotomus by a combination of the following characters: body size relatively moderate, 12.5–14.0 mm in length, yellowish brown to black, with black punctures; head and pronotum with long, dense pilosity; vertex black, with pale yellow midline and macula on both sides; posterior angle of pronotum slightly upward, not sharp; forewings with small, light-coloured spots, and anterolateral margin pale; meta-femora with 3–5 spines on the inner margin of the terminal half, becoming gradually longer from proximal to terminal; surcapsular spines of the genital capsule acute and straight, extending without any projection or bifurcation; parameres strongly curved upward, elongate and slender, tapering gradually towards apex, and each with one or two prominent acute projections in the middle on the inner side.

Material examined. China: Hebei Province: 1 ♂, Xiaowutaishan National Nature Reserve, Donglingshan, 1700 m, 21-August-2005, Xin Yu leg. (NKUM) ; Inner Mongolia: 3 ♂♂, 1 ♀, Chifeng City, Keshiketeng Banner, Daerhansumu, 1240 m, 9-August-2008, Xueqin Shi leg. (NKUM) ; Shanxi Province: 4 ♂♂, 1 ♀, Xinzhou City, Wutai County, Taihuai Town, Wutaishan National Nature Reserve, Xinyinsi Temple, 39.01°N, 113.63°E, 1844 m, 13-August-2020, Wenbo Yi leg. (XZTU) ; 9 ♂♂, 4♀♀, Xinzhou City, Wutai County, Taihuai Town, Wutaishan National Nature Reserve, Loushang Village, 39.00°N, 113.65°E, 1924 m, 13-August-2020, Wenbo Yi leg. (XZTU) ; 8 ♂♂, 3 ♀♀, Xinzhou City, Wutai County, Taihuai Town, Wutaishan National Nature Reserve, Muwagou, 39.03°N, 113.62°E, 1849 m, 14-August-2020, Wenbo Yi leg. (XZTU) .

Distribution. China (Hebei, Inner Mongolia, Shanxi).

Remarks. This species is readily recognized within the genus Megalotomus by its diagnostic characters, as thoroughly described and illustrated in Liu & Liu (1998). During field work in Wutaishan National Nature Reserve, Shanxi Province, China, large amounts of adults of this species were found on Melilotus officinalis, a common herbaceous plant of Leguminosae, which is highly suspected to be the host plant of this species, since there are no previous host records.