Key to the species of Grotea ocurring in Brazil and Suriname

1. Propodeum with anterior transverse carina forming a smooth arc (Fig.22)......................................... 2

- Propodeum with anterior transverse carina centrally indented.................................................. 4

2. Gena with ventroposterior angle modified to form a conspicuous tooth or process (Fig. 7).................................................................................................. G. surinamese Herrera-Flórez sp. n.

- Gena with ventroposterior angle modified to form an inconspicuous tooth or process................................ 3

3. Metasoma with tergite I slightly longer than mesosoma; fore wing hyaline with a distal brownish spot (Fig.6).................................................................................. G. amazonensis Herrera-Flórez sp. n.

- Metasoma with tergite I slightly shorter than mesosoma; fore wing hyaline lacking distal brownish spot (Figs 22 & 23).............................................................................. G. perplexa Slobodchikoff 1970

4. Gena with ventroposterior angle modified to form a sharp tooth (Fig. 1)............ G. goianiense Herrera-Flórez sp. n.

- Gena with ventroposterior angle modified into a spatulate, ellipsoid lobe (Figs 4 & 11).............................. 5

5. Head in dorsal view with gena flat, not concave; a mostly reddish and black species (Fig. 2).................................................................................................... G. paulista Herrera-Flórez sp. n.

- Head in dorsal view with gena slightly concave; a mostly yellow species (Figs 11–18)....... G. delicator (Thunberg 1822)