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 297542 10.11646/zootaxa.5453.3.2 bec20d3c-d40b-4236-af60-0a619e47a959 1175-5326 11234118 285FAECF-D307-48F5-9FA1-DE6320EA0F7C

TABLE 2. Main characters difference in female of A. occidentalis, new species and related species.

female character	A. occidentalis	A. rondoni	A. acuminatus	A. chelifer
head	external margin of ocular canthus straight; clypeolabrum moderately concave (fig. 31)	external margin of ocular canthus straight; clypeolabrum slightly concave (fig. 32)	external margin of ocular canthus convex; head widest among the related; clypeolabrum deeply concave (fig. 33)	external margin of ocular canthus convex; clypeolabrum moderately concave (fig. 34)
pronotum	lateral angles present; median portion of surface with distinctly impunctate area (fig. 31)	lateral angles present; median portion of surface with distinctly impunctate area (fig. 32)	lateral angles present; median portion of surface without distinctly impunctate area (fig. 33)	lateral angles absent; most portion of surface with distinctly smooth reliefs (fig. 34)
genitalia	spermathecal duct short (figs. 35, 36)	spermathecal duct short (fig. 37)	spermathecal duct long (fig. 38)	spermathecal duct long (fig. 39)