Eurypogon japonicus Sakai, 1982

(Figs 5A, B; 9B,C; 10K; 12H)

Eurypogon japonicus Sakai, 1982: 52 .

Type locality. “Mt. Daisen, Tottori Pref. ” [Japan, Honshu, Tottori Prefecture, Mt. Daisen, ca. 35°22′N 133°32′E].

Type material. Holotype male (EUMJ), labeled: “DAISEN, TOTTORI, 23/ 27.V.1959, H. Yokoyama ”, “ Holotype Eurypogon japonicus SAKAI 1982 ”. 28 paratypes [not studied by us], nine males, 19 females (21 paratypes, eight males and 13 females in EUMJ).

Additional material examined. JAPAN: HONSHU: 2 males, Mie Pref., Hirakura, Misugi-mura [vill.] , 23. V.1993, H. Yoshitomi leg. (NMPC); 2 males 1 female, Mie Pref., Myojindake, 22. VI.1993, H. Kawase leg. (NMPC); 1 female, Gifu pref., Hiwada, Takane-mura [vill.], 6.VII.1994, H. Yoshitomi leg. (NMPC); 1 male, Gunma Pref., Konuma, Mt. Akagi, 21. VI.1998, S. Tsuyuki leg. (NMPC).

Diagnosis. This species can be recognized based on the following combination of characters: eyes almost as wide as the anterior margin of pronotum (Figs 5A,B; 9B,C), pronotal punctation (Fig. 9B,C) very dense, with most punctures very close to each other, elytra together about 2.3 times as long as wide, the elytral surface (Fig. 10K) rather smooth and with mostly large punctures, and the median lobe (Fig. 12H) about 5.4–5.8 times as long as wide.

Sexual dimorphism. Females are more robust and relatively shorter than males, being about 2.4–2.5 times as long as wide (excluding head; about 2.7 times in males; Fig. 5A,B). Females have shorter and less serrate antennae (serrations less acute) than males (Sakai 1982).

Distribution. This is the most widespread Japanese Eurypogon, currently being known from Honshu, Shikoku, and Kyushu Islands (Fig. 15).