Orthomus susanae, Serrano, Artur R. M., Aguiar, Carlos A. S., Boieiro, Mário C., Borges, Paulo A. V., Rego, Carla, Amorim, Isabel R., Ribeiro, Sérvio P. & Pereira, Fernando, 2009

Serrano, Artur R. M., Aguiar, Carlos A. S., Boieiro, Mário C., Borges, Paulo A. V., Rego, Carla, Amorim, Isabel R., Ribeiro, Sérvio P. & Pereira, Fernando, 2009, A new species of Orthomus Chaudoir, 1838 (Coleoptera: Carabidae) from Madeira island (Macaronesia) and notes on related species, Zootaxa 1972, pp. 20-34 : 31-32

Key to the Madeira species of male Orthomus (Nesorthomus)

1 Length of body> 12 mm. Disk of posteriad third of elytra domed. General body color brownish to black, not very shiny. Median lobe of aedeagus as in figures 7c and d ........................... O. bedelianus (Lutshnik)

- Length of body <12 mm. Disk of posteriad third of elytra flattened. General body color brownish, shiny. Median lobe of aedeagus different from above............................................................................................2

2 Posteriad half inner margin of mesotibiae with evident dilatation...............................................................3

- Posteriad half inner margin of mesotibiae with a slight or without evident dilatation.................................5

3 Metatibiae slightly arched, posteriad third inner margin with evident dilatation.........................................4

- Metatibiae straight, posteriad third inner margin without evident dilatation. Median lobe of aedeagus as in figures 8 a and b.................................................................................................... O. dilaticollis (Wollaston)

4 Interval 3 of elytron with two setiferous pore punctures very close or in third stria. Median lobe of aedeagus as in figures 5 a and b ................................................................................................... O. susanae n. sp.

- Interval 3 of elytron with two setiferous pore punctures, the anterior one very close to third stria, the posterior one very close or in the second stria. Median lobe of aedeagus as in figures 5 c and d. ...................... ...................................................................................................................................... O. lundbladi Jeannel

5 Posteriad half inner margin of mesotibiae with a slight dilatation...............................................................6

- Posteriad half inner margin of mesotibiae without any dilatation................................................................7

6 Median lobe of aedeagus with ventral margin of apex straight; apex not bent down (lateral view) ( Figs 8 c and d) ........................................................................................................................... O. curtus (Wollaston)

- Median lobe of aedeagus with ventral margin of apex arched; apex bent down (lateral view) ( Figs 7 a and b) ...................................................................................................................................... O. pecoudi Jeannel

7 Median lobe of aedeagus as in figures 9 a and b ................................................... O. gracilipes (Wollaston)

- Median lobe of aedeagus as in figures 9 c and d ............................................................. O. berrai (Battoni)