Chromatonotus diminutivus sp. nov.

(Figs. 8–14, 28, 32)

Measurements (mm). Holotype and two paratype males: total length 10.0; length of pronotum 2.0; width of pro- notum 3.0; length of tegmina 9.0; width of tegmina 2.5. Paratype females (n = 6): Total length 9.4–9.7; length of pronotum 1.8; width of pronotum 2.5–2.6; length of tegmina 7.7–7.8; width of tegmina 2.3.

General coloration hyaline brown and bright (Fig. 32). Head light brown with brownish darker spots Fig. 8). Pronotum brown with small, dispersed, light brown spots; central disk light milky brown (Fig. 9).

Vertex of head covered by pronotum. Interocular space equal to the distance between the bases of the antennae.

Thorax with pronotum trapezoidal, with rounded border. Tegmina long with narrow marginal field, oblique scapular field, and convex and elongated discoidal field. Anteroventral face of the anterior femur type B3. Posteroventral face with a median spine and two subapical spines. Medial and posterior legs with strong, spaced spines on both ventral faces. Pulvilli on all tarsal articles. Claws symmetrical, simple.

Abdomen with first-segment tergal modification arranged as a group of symmetrical setae in the medial region of the segment (Fig. 28). Supraanal plate triangular posteriorly with fine setae, projected between cerci; paraprocts differentiated with spiniform apices; developed cerci (Fig. 10). Subgenital plate slightly asymmetrical and setose styles differentiated, with the right style larger than the left, both acuminate apically (Fig. 11). Left phallomere a hook-shaped horn with pointed apex (Fig. 12). Right phallomere Y-shaped with asymmetrical arms with extension at the apex of one of them; sclerotized medial structure (Fig. 13). Long median sclerite with rounded apex (Fig. 14).

Type material. Holotype male (MNRJ): Brazil, Mato Grosso, Sinop (12° 31’S, 55°37’W), BR 163, between 500 and 600-km markers, elevation 350 m, IX/1974, Roppa & Alvarenga. colls . Paratypes: 2 males and 6 females (MNRJ), same data as holotype .

Etymology. The name of the species is a Latin word that means small, referring to the size of the specimens of the species.

Discussion. Chromatonotus diminutivus sp. nov. differs from all other species by its small size, the configuration of the supraanal and subgenital plates and the genital structures of the median sclerite, left phallomere and right phallomere.