Limaytilla, Casal, 1964

Torréns, Javier & Fidalgo, Patricio, 2019, A new species of Limaytilla Casal, 1964 (Hymenoptera: Mutillidae) from Argentina, a key for the known species, and new record data for the Argentinian species, Zootaxa 4609 (3), pp. 583-593 : 584

Key to Argentinian species of Limaytilla (males)

1. Specimen large, body shape robust (12.0– 15.7 mm.) (Figs 3, 4) or slender (11.2–15.4 mm; rarely a little more than 10.0 mm) (Figs 1, 2); head quadrangular in dorsal view with outline of the posterior margin of the head slightly convex to virtually straight (Figs 14, 15, 18, 19)................................................................................... 2

- Specimen small to medium and body shape slender (5.0–10.0 mm) (Figs 5–10); head triangular in dorsal view with outline of the posterior margin of the head strongly convex (Fig. 11)......................................................... 3

2. Specimens slender (Figs 1, 2); mandible robust and strongly delineated (Figs 14, 16); basal ventral tooth of mandible attached to a keel thus appearing bilobate (Fig. 16, indicated); first segment of metasoma relatively long (2.3× as long as broad) ( Fig. 20 ); antennal projected as a cone-shaped protuberance well developed (Fig. 18)...................... L. diaguita sp. nov

- Specimens robust (Figs 3, 4); mandible not robust and barely delineated (Figs 15, 17); basal ventral tooth simple (Fig. 17, indicated); first segment of metasoma relatively short (1.4× as long as broad) ( Fig. 21 ); antennal tubercle projected as a slight sub-triangular protuberance (flattened laterally) (Fig. 19).......................................... L. huarpe Casal

3. Mandible widened abruptly on anterodorsal margin, widening to the height of the first dorsal tooth and tapering towards the apex (Fig. 12)....................................................... L. larioja Cambra, Quintero & Pagliano

- Mandible with almost parallel margins from base to apex (Fig. 13).............................................. 4

4 Antennal tubercles with sharp projections and converging ventrally (see Fig. 5 in Casal, 1964); vertex and frons foveo-reticulate (see Fig. 2 in Casal, 1964)............................................................... L. pehuenche Casal

- Antennal tubercles with inner subtriangular and dorsally convergent projection (see Fig. 4 in Casal, 1964); vertex and frons with medium-sized contiguous punctures (see Fig. 3 in Casal, 1964)..................................... L. pampa Casal

Figures

FIGURES 20–29. Limaytilla spp. ♂. 20, L. diaguita sp. nov., first metasomal segment (dorsal). 21, L. huarpe, first metasomal segment (dorsal). 22–24, L. diaguita: 22, genitalia; 23, paramere (apical); 24, gonobase (side). 25–27, L. huarpe: 25, genitalia; 26, paramere (apical); 27, gonobase (side). 28, 29, L. orlandoi: 28, habitus (lateral); 29, habitus (dorsal).