Key to species of Tobantilla

Males (unknown for T. aleatrix sp. nov., T. charrasca Casal, T. frigidula (Cresson), T. kolasma sp. nov., T. krima sp. nov., T. montonera Casal)

1. Anteromedial margin of clypeus flat, shallowly emarginate (Fig. 36)............................................. 2

- Anteromedial margin of clypeus with single raised tubercle (Fig. 35)............................................. 3

2. Base of T2 with patch of appressed white setae (Fig. 16)......................................... T. drosos sp. nov.

- T2 having asetose interspaces and sparse erect white setae throughout disc (Fig. 17)............... T. ephemeros sp. nov.

3. Metasoma entirely black except for second segment (Fig. 15); legs blackish, concolorous with pleura... T. andrikos sp. nov.

- Metasoma entirely yellowish-brown except segments six and seven infuscated (Fig. 18); legs yellowish-brown, much lighter than dark brown to black pleura............................................................ T. xouthos sp. nov.

Females (unknown for T. andrikos sp. nov., T. drosos sp. nov., T. ephemeros sp. nov., T. xouthos sp. nov.)

1. Head and mesosoma dark red to black (Figs 3, 9); pygidium having single longitudinal medial carina apical to small pygidial plate (Figs 13, 37)..................................................................... T. frigidula (Cresson)

- Head and mesosoma pale brown to orange (e.g. Figs 1, 2); large pygidial plate well defined by lateral carinae, reaching apex of pygidium (e.g. Figs 14, 38)............................................................................. 2

2. Scutellar scale connected with carinae separating dorsal and posterior propodeal faces, forming broad continuous arcuate ridge (Fig. 4); posterior face of propodeum clothed with dense black setae (Fig. 10)....................... T. kolasma sp. nov.

- Scutellar scale relatively narrow, distinct from carinae separating dorsal and posterior propodeal faces (e.g. Figs 2, 6); posterior face of propodeum clothed with pale silver, golden, or brown setae (e.g. Figs 8, 12)................................. 3

3. T2 having only one pair of yellow integumental spots (Fig. 5); pronotum clothed with black setae, contrasting with silver mesonotal setae (Fig. 5)................................................................... T. krima sp. nov.

- T2 having two pairs of yellow integumental spots, sometimes with anterior and posterior spots confluent (Figs 1, 2, 6); mesosomal dorsum clothed with concolorous pale golden setae, sometimes with scattered brown setae on posterior portion of mesonotum (Figs 1, 2, 6).............................................................................. 4

4. T4 clothed entirely with silver setae; head about 1.2 × width of pronotum; T2 with anterior and posterior spots confluent or scarcely separated (Fig. 6)............................................................... T. montonera Casal

- T4 having black setae, at least basally; head about 1.1 × width of pronotum; T2 with anterior and posterior spots distinctly separated (Figs 1, 2)...................................................................................... 5

5. Mesosomal width slightly greater than length, mesothorax as wide as pronotum, propodeum parallel-sided and flattened posteriorly with posterolateral angle abrupt (Fig. 2); femora darkened medially; flagellomere two only slightly longer than pedicel..................................................................................... T. charrasca Casal

- Mesosomal length slightly greater than width, mesothorax narrower than pronotum, propodeum narrowing posterad and weakly convex posteriorly with posterolateral angle rounded (Fig. 1); femora entirely light orange brown; flagellomere two about one-third longer than pedicel......................................................... T. aleatrix sp. nov.