Psammoecus, Latreille, 1829

Yoshida 1, Takahiro, Karner, Michael & Hirowatari, Toshiya, 2018, A Revision of Taiwanese Species in the Genus Psammoecus Latreille (Coleoptera, Silvanidae), Zoological Studies 57 (18), pp. 1-18 : 16

Key to species of the Genus Psammoecus of Taiwan (after Yoshida and Hirowatari 2014)

1. Teeth of lateral margins of pronotum relatively short and of identical size ..................................................................... 2

- Teeth of lateral margins of pronotum relatively long. Posterior teeth longer than those of anterior margins ...... 5

2. Distance between teeth of lateral margins of pronotum irregular ................................................ dentatus Grouvelle

- Distance between teeth of lateral margins of pronotum regular .............................................................................. 3

3. Anterior margin of pronotum weakly curved. Dorsolateral portions of pronotum with no impressions ........................... ............................................ hiranoi Yoshida and Hirowatari

- Anterior margin of pronotum strongly curved. Dorsolateral portions of pronotum impressed lightly ............................. 4

4. A row of long erect setae along each lateral margin of elytra. Anterior angles of pronotum somewhat expanded ... ............................................................. taiwanensis sp. nov.

- No long seta on anterolateral margins of elytra. Anterior angles of pronotum not expanded ....... harmandi Grouvelle

5. Black elytra with yellow maculae ........... simonis Grouvelle

- Yellow elytra with black maculae or no maculae .............. 6

6. Teeth of lateral margins of pronotum long and slender. Pubescence composed of setae of two types, moderate length and long, on head and pronotum. Punctation weak and sparse ........................................... delicatus Grouvelle

- Teeth of lateral margins of pronotum distinct, but shorter. Pubescence composed of mostly same length setae on head and pronotum. Punctation somewhat strong and dense ................................................................................ 7

7. Basis of parameres wide. Distance between posterior margin of phallobase and deepest point of incision of anterior margin broad ................. trimaculatus Motschulsky

- Basis of parameres comparatively narrow ....................... 8

8. Distance between posterior margin of phallobase and deepest point of incision of anterior margin wide. Widened basal part of parameres rectangular .................................... ................................... labyrinthicus Yoshida and Hirowatari

- Distance between posterior margin of phallobase and deepest point of incision of anterior margin narrow. Widened basal part of parameres triangular ....................... .................................................................. triguttatus Reitter