Tuberculobasis arara sp.nov.

Figures 25–26, 57–59

Etymology: The name refers to the Arara indian people who inhabit the municipality of Ji-Paraná.

Type specimen: Holotype (3), BRAZIL, Rondônia State, Ji-Paraná (8º03´N, 62º52´W), 25-I-1961, Machado & Pereira leg. (inside forest, away from water) (ABMM).

Description. Male holotype.

Head. Missing.

Thorax. Prothorax: Anterior lobe grey, median lobe brown with brown-yellowish lateral areas. Posterior lobe reddish brown. Pterothorax: mesopleuron and metepisternum ventrally brownish yellow, dorsally brown with a poorly defined antehumeral grey stripe and a well defined metepisternal stripe continuing on to mesinfrepisternum. Legs yellow, wings hyaline, venation brown, pterostigma reddish brown. Px in FW 11–12 in HW 10; R 3 in FW originating near Px 6, in HW near Px 4–5. Petiolation distal to Ac by a distance twice or 1.5 times the length of Ac in FW and 1.5 times in HW.

Abdomen. S1–2 dorsally brown, laterally whitish blue. S3–6 dorso-laterally dark brown with a pre-apical lateral yellow marking scarcely visible. S7–10 and cercus yellowish orange. Paraproct brown.

Structural characters. Hind prothoracic lobe (Figs 25, 26) without lateral lobes, median lobe subrectangular, dorsal lip fused medially with ventral lip resulting a median depression (Fig. 25). Mesepisternal tubercles (Figs 25, 26) high (2.36 mm) and divergent in dorsal view (Fig. 25) with the apex subtruncated (Fig. 25). Cercus (Figs. 57–59) shorter than S10, about 1/3 shorter than paraprocts, with short ventro-medial subtriangular process (Figs 58–59). Penis typical for Tuberculobasis (as in Fig. 89).

Dimensions (mm). Abdomen 31.2; HW 19.2

Remarks. By having high metepisternal tubercles with their bases adjacent to mid-dorsal carina, paraproct much longer than cercus, and no lateral lobes in hind prothoracic lobe, T. arara belongs in the costalimai species group together with T. guarani, T. inversa, T. costalimai, and T. williamsoni . It is closer to