Synchroa Newman, 1838

Hsiao, Yun, Li, Yun, Liu, Zhenhua & Pang, Hong, 2016, A new species of Synchroa Newman from China (Coleoptera: Synchroidae), Zootaxa 4093 (4), pp. 595-600 : 595-596

Key to the world fauna of the genus Synchroa Newman, 1838

(after Nikitsky 1999; Hsiao 2015)

1. Body completely black. Prothorax narrower than the width of elytra at humeri. Mainland China (Sichuan) .................................... .................................................................................................................................................................... S. pangu sp. nov. ( Fig. 1 )

- Body reddish to blackish brown. Prothorax as wide as the width of elytra at humeri ...................................................................... 2

2. Lateral sides of pronotum almost entirely margined. Median part of posterior half of pronotum smooth and impunctate. North

America.................................................................................................................................................... S. punctata Newman, 1838 - Lateral sides of pronotum not margined or margined only in posterior part. Median part of posterior half of pronotum punctate. Not known from North America....................................................................................................................................................... 3 3. Sides of pronotum not margined. Faint traces of striae obvious in posterior or anterior part of elytra ............................................ 4

- Sides of pronotum distinctly margined in posterior one-third or one-fourth. Elytra with distinct traces of striae at base, or striae entirely missing.................................................................................................................................................................................. 5

4. Faint traces of striae obvious in posterior part of elytra. Mainland China (Sichuan) .............................. S. chinensis Nikitsky, 1999

- Faint traces of striae obvious in anterior part of elytra. Taiwan................................................................. S. formosana Hsiao, 2015

5. Elytra elongate, 3.0–3.1 times as long as wide and narrowed posteriorly. Antennomere XI 4.3–5.0 times as long as wide. Antennae, most part of legs and maxillary palpi infuscated. Vietnam............................................................. S. elongatula Nikitsky, 1999

- Elytra less elongate, 2.5–2.8 times as long as wide and not so narrowed posteriorly. Antennomere XI 2.5–2.8 times as long as wide. Antennae and legs partly reddish. Russia (Far East), Japan........................................................ S. melanotoides Lewis, 1895

Figures

FIGURE 1. Dorsal habitus of Synchroa pangu sp. nov. Scale bars: 1.0 mm.