Identification key for workers and gynes of the Gnamptogenys minuta -group

The new species G. piei is included in the identification keymodified from Lattke and Delsine (2016):

1. Propodeum with a pair of denticles ... ... ... ... .. ... ... ... .. 7 - Propodeum continuous, denticles absent ... ... ... ... .. ... .. 2

2. Integument mostly opaque, sculpturing predominantly granulose with variable degrees of areolae/foveolae .. ... .. ... ... ... .. 3

- Integument mostly shiny or silky, sculpturing can be finely striolate orsmoothwith variabledegrees of areolae/foveolae ... 5

3. Mandible falcate, masticatory margin edentate and concave (north-central Venezuela) ................................... G. fieldi

- Mandible triangular, masticatory margin fairly straight and denticulateorcrenulate ............................................ 4

4. Metanotal groove well-impressed; spiracles of abdominal segments Iand II shining and conspicuous (northwestern Venezuela).............................................. G. petiscapa

- Metanotal groove absent; spiracles of abdominal segments Iand II opaque and not conspicuous (southern Mexico - Brazil) ..................................................... G. minuta

5. Mandiblefalcate (northern South America) ...... G. falcifera

- Mandibletriangular .......................................... 6

6. Eye not prominent, broadly convex; anterior clypeal margin broadly convex; occipital lobe rounded (southern Mexico - Costa Rica) .................................................... G. simulans

- Eye prominent, semispherical; anterior clypeal margin medially concave; occipital lobe subangular (eastern Ecuador - central Brazil).................................................... G. vriesi

7. Meso- and metatibial spurs absent (Colombia - southern Brazil)..................................................... G. caelata

- Meso- andmetatibialspurspresent ......................... 8

8. Clypeal lamella present; clypeus with a median tooth, postpetiolar tergite mostly with arched punctate-rugulae (southwestern Brazil) ............................................... G. striolata

- Clypeal lamella absent; clypeus with a median lobe; postpetiolar tergite with rough longitudinal costulae medianly (southeast Brazil) ................................................... G. piei n. sp.