Arthrobrachus nigromaculatus Solier, 1849

(Figure 7)

Arthrobrachus scutellaris Philippi & Philippi, 1864: 273; Estrada & Solervicens 1999: 45 Arthrobrachus subaeneus Philippi & Philippi, 1864: 272; Estrada & Solervicens 1999: 45 Arthrobrachus nigromaculatus var. solieri Pic, 1919: 10; Estrada & Solervicens 1999: 45 Arthrobrachus vicinus Pic, 1919:10; Estrada & Solervicens 1999: 45

Arthrobrachus impressithorax Pic, 1919:10; Estrada & Solervicens 1999: 45

Diagnosis. Elytra black or black with two red areas of a variable size; antennae with five preapical dilated antennomeres (Fig. 7 g); pronotum with a deep impression adjacent to the posterior angle; male ventrite 6 divided in two large and convergent plates; parameres with conspicuous median carina, its sides bend ventrally at the base forming a semi-cylindrical cavity for the median lobe; tegmen with a well developed dorsal flange at the base of the parameres and strongly sclerotized ventral plate, tegminal arms gradually converging to the apodeme (Fig. 7 a–c); median lobe slighty sinuated in lateral view, with membranous dorsal surface and wide basal flection area (Fig. 7 d–f).

Distribution. ARGENTINA: provinces of Mendoza, Neuquén, Rio Negro and Chubut. CHILE: between provinces of Elqui and General Carrera (Fig. 10).