A revision of the giant Amazonian of the (, Formicidae) 149

Discussion. Dinoponera mutica is a valid based on our study. is the closest to D. mutica in terms of morphological characters and is not synonymized in this work because of the differences stated in the diagnosis above. Males of D. mutica may provide further support for separation from D. quadriceps. Dinoponera quadriceps has a finely micro-sculptured integument which is not shiny (Fig. 12B), lacks gular striations and has a petiole which bulges on the dorso-anterior edge. Dinoponera longipes and D. hispida may also be confused with D. mutica but this species lacks the dense golden pubescence of the former, or the short, stiff setae and forward bulging petiole of the latter. Material examined. , MATO GROSSO DO SUL: Corumbá (1 w, MCZC); Urucum, Corumbá (3 w, 23–29.xii.1919, LACM, CUIC); RONDÔNIA: 7 km NW Costa Marques (1 w, 16.xi.1986, R Wilkerson, FSCA); Schmitt Ranch (1 w, ix.1996, R. Rogers, PALC). , SANTA CRUZ: Perseverancia (1 w, 18.iii.1990, P Bettella, LACM). , BOQUERÓN: Enciso (1 w, T. del Sinne, CWEM).

Dinoponera quadriceps Kempf http://species-id.net/wiki/Dinoponera_quadriceps Figs 4B, G, L, 5A, 6A, 10A, 11A, 12B, 13

Dinoponera quadriceps Kempf, 1971: 380, first available use ofDinoponera grandis st. mutica var. quadriceps Santschi, 1921: 84; unavailable name, BRAZIL: Pernam- buco: São Lourenço da Mata, Tapera (NHMB, examined). Dinoponera mutica var. Mann, 1916, male Dinoponera gigantean mutica var. quadriceps Borgmeier 1937 male designated BRA- SIL: Pernambuca, Tapera. Dinoponera opaca Santschi, 1921. Holotype worker BRAZIL: Rio Janeiro (Goeldi) (1 w NHMB, examined); junior synonym of D. quadriceps Kempf 1975: 344

Worker diagnosis. This species is recognized by its finely micro-sculptured integu- ment which is not shiny (Fig. 12B), rounded anterior inferior pronotal corner lacking a tooth-like process (Fig. 1E), ventral side of the head lacking any gular striations and long/flagellate pilosity. Description of the worker. Measurements (mm) (n=17) TBL: 28.09–33.73 (30.60); MDL: 4.10–5.05 (4.53); HL: 5.23–6.04 (5.58); HW: 5.33–5.97 (5.56); SL: 5.54–6.12 (5.80); WL: 7.38–9.03 (8.20); PL: 2.26–2.68 (2.50); PH: 3.06–3.52 (3.26); PW: 1.64–1.99 (1.80); GL: 8.20–11.93 (9.80); HFL: 7.18–8.11 (7.65). A de- scription of the worker is given in Emery 1911, Mann 1916, Borgmeier 1937, Kempf 1971. Presented below is that of Kempf (1971): "Antennal scape notably longer than head width. Pubescence on front and vertex of head short and inconspicuous. Gular surface of head reticulate-punctate, subopaque, but lacking arcuate striae except for some cases when a few short and vestigial striae appear