Stenus hostilis

Puthz, V., 2014, Neue und alte neotropische Stenus-Arten (Coleoptera, Staphylinidae) 339. Beitrag zur Kenntnis der Steninen, Linzer biologische Beiträge 46 (2), pp. 1671-1736 : 1676-1677

Key to the species of the S. hostilis -group

1 Abdominal punctation finer and sparser, interstices on tergites 6 and 7 much larger than diameter of punctures (fig. 21)....................................................................................2

- Abdominal punctation dense, interstices on tergites 6 and 7 mostly smaller than diameter of punctures (fig. 20)............................................................................................4

2 Abdomen with long golden pubescence, interstices of punctation on tergites 3-5 larger than diameter of punctures..................................................................................................3

- Abdomen with short, whitish-yellow pubescence, interstices of punctation on tergites 3-5 mostly smaller than diameter of punctures.: E (fig. 67). 3.1-3.8mm (FB 1.9- 2.1mm). Mexico......................................................................................... S. jelineki PUTHZ

3 Disc of pronotum with some impressions, distinctly elevated in actual middle.: E (fig. 17). 3.1-3.6 mm (FB 1.7-1.8mm) .................................................... S. mixcoatl nov.sp.

- Disc of pronotum without distinct impressions or elevated areas.: E (figs 13, 14). 3.5-4.0mm (FB 1.9mm). Panama............................................................... zunilensis SHARP

4 Apterous or brachypterous, EW: EL 1.14.........................................................................5

- Macropterous, EW: EL <1.14..........................................................................................11

5 Apterous, EW: EL  1.49 (fig. 22).: E (fig. 42). 3.0-3.9mm (FB 1.5-1.6mm). Mexico................................................................................................................. S. apterus nov.sp.

- Brachypterous/micropterous, EW: EL <1.25......................................................................6

6 Larger, FB 2.0mm.............................................................................................................7

- Smaller, FB <2.0mm ...........................................................................................................9

7 Pronotal disc with a narrow elevated median elevation (figs 24, 29); elytral sculpture vorticose; legs predominantly reddish brown......................................................................8

- Pronotal disc with a median sulcus; elytral punctation mostly distinctly delimited, occasionally slightly confluent; legs dark brown.: Unknown. 3.7-4.3mm (FB 2.0- 2.1mm). Mexico.......................................................................................... S. zoilus nov.sp.

8: E (fig. 38). 3.0-4.9mm (FB 2.0-2.1mm). Mexico, Guatemala, Nicaragua, Honduras...... ............................................................................................. S. schneiderianus BERNHAUER

-: E (fig. 39). 3.9-4.5mm (FB 2.0-2.2mm). Mexico....................... S. chiapasensis nov.sp.

9 Smaller, FB 1.4-1.5mm, abdominal punctation very dense, interstices also in the middle of tergites smaller than diameter of punctures.: E (fig. 48). 2.3-2.8mm (FB 1.4-1.5mm). Costa Rica............................................................................ S. kethleyi nov.sp.

- Larger, FB 1.6mm, interstices in the middle of tergites larger than diameter of punctures...........................................................................................................................10

10 Elytral punctation mostly distinctly delimited; segment 1 of metatarsi about as long as segment 5.: E (fig. 51). 2.9-3.7mm (FB 1.6-1.7mm). Costa Rica... S. irazumontis PUTHZ

- Elytral punctation distinctly coalescent; segment 1 of metatarsi much longer than segment 5.: Unknown. 3.6-4.3mm (FB 1.8-1.9mm). Costa Rica...................................... ..................................................................................................... S. monteverdensis nov.sp.

11 Smaller, FB 1.7mm.........................................................................................................12

- Larger, FB 1.7mm...........................................................................................................14

12 Apical half of femora darkened. Frons shallowly concave...............................................13

- Femora completely reddish brown. Frons deeply concave.: E (fig. 46). 2.6-3.5mm (FB 1.6-1.7mm). Mexico................................................................................ S. pilli nov.sp.

13 Smaller, FB 1.5mm.: E (fig. 49). 3.0mm. Costa Rica..................... S. heredianus nov.sp.

- Larger, FB 1.7mm.: Unknown. 3.0-3.5mm. Costa Rica................ S. dybasianus nov.sp.

14 Legs blackish or dark brown (also basal half of femora)..................................................15

- Legs brownish, base of femora mostly lighter..................................................................17

15 Elytra with a rosette in posterolateral half (fig. 23), punctation of pronotum less dense, interstices occasionally larger than diameter of punctures.: E (fig. 71). 3.8-4.5mm (FB 2.2mm). Mexico............................................................................. S. zunicoides PUTHZ

- Elytra densely, slightly confluently punctured, without a rosette in posterolateral half, punctation of pronotum denser, interstices generally smaller than diameter of punctures 16

16 Abdominal punctation very dense, interstices on tergite 5 smaller than half diameter of punctures; elytra longer, EW: EL  1.0.: E (fig. 52). 3.0-3.6mm (FB1.8-1.9mm). Mexico.................................................................................................. S. nimborum SHARP

- Abdominal punctation slightly less dense, interstices in the middle of tergite 5 distinctly larger than half diameter of punctures; elytra less long (EW: EL 1.06).: Unknown. 2.9-3.3mm (FB 1.9mm). Peru.............................................. S. zabolicus nov.sp.

17 Abdomen with conspicously long golden pubescence.: E (fig. 16). 3.0-3.5mm (FB 1.8mm). Mexico.................................................................................... S. auricomus PUTHZ

- Abdomen with shorter, less conspicuous golden or whitish-yellow pubescence..............18

18 Elytra broader, EW: EL 1.10..........................................................................................19

- Elytra less broad, EW: EL<1.10.......................................................................................20

19 Abdomen very coarsely and desnely punctate, punctures on tergite 7 about as large as apical croass section of antennal segment 2, interstices much smaller than half diameter of punctures........................................................................................................20

- Abdomen less coarsely and slightly less densely punctate, punctures on tergite 7 about as large as basal cross section of antennal segment 3, interstices slightly larger than half diameter of punctures.: E (fig. 62). 3.5-4.7mm (FB 2.0-2.2mm). Mexico, Guatemala................................................................................................. S. hostifer PUTHZ

20: E (fig. 40). 3.5-4.0mm (FB 1.7-1.9mm). Mexico......................... S. corniculifer nov.sp.