An updated identification key to Eurypogon species from the Chinese mainland

1. Head and pronotum blackish, elytra metallic blue to green (Fig. 1C, D).......................................... 2

-. Head, pronotum, and elytra more or less uniformly dark brown to blackish....................................... 3

2. Pronotum with slightly concave sides and not so prominent posterior angles (Fig. 2F in Kundrata et al. 2013); punctures on head and pronotum larger and denser............................................. E. jaechi Kundrata et al., 2013

-. Pronotum with distinctly concave sides and prominent posterior angles (Fig. 2G in Kundrata et al. 2013); punctures on head and pronotum smaller and sparser........................................... E. heishuiensis Kundrata et al., 2013

3. Male elytra ≥ 2.3 times as long as wide; female elytra ≥ 2.1 times as long as wide; aedeagus with U-shaped phallobase (Fig. 12D)....................................................................... E. sanzang Wang & Liu, 2021

-. Male elytra ≤ 2.2 times as long as wide; female elytra ≤ 2.0 times as long as wide; aedeagus without U-shaped phallobase.. 4

4. Elytra with relatively rough surface, elytral punctures coarse, moderately large to large (Fig. 10B, E).................. 5

-. Elytra with relatively smooth surface, elytral punctures fine, small (Fig. 10C, F)................................... 6

5. Intervals between elytral punctures within single row usually less than 1.0 times puncture diameter; intervals between elytral punctures of different rows usually about 1.0 puncture diameter (Fig. 10B); parameres distinctly shorter, reaching about 3/5 of median lobe (Fig. 12B)............................................................... E. pubescens sp. nov.

-. Intervals between elytral punctures within single row usually 1.0–2.0 times puncture diameter; intervals between elytral punctures of different rows usually about 2.0–3.0 puncture diameter (Fig. 10E); parameres distinctly longer, reaching about the place where the median lobe is abruptly narrowed subapically (Fig. 12E)............ E. schuhi Packova & Kundrata, 2023

6. Aedeagal median lobe robust, with sides subparallel for most of their length, width at base almost equal to width in middle (Fig. 12C)................................................................................ E. ruzickai sp. nov.

-. Aedeagal median lobe slender, distinctly widest basally, width at base approximately twice width in middle (Fig. 12F)........................................................................................... E. turnai sp. nov.