Rhinocricus itauba sp. nov.

(Figs. 1–7)

Types. Holotype male from Itaúba, Arroio do Tigre, Rio Grande do Sul, Brazil, 11.IV.1978, H. Bischoff leg. (MCN 121). Paratype female, same data as the holotype, 17.IV.1978 (MCN 128).

Etymology. The specific name is a noun in apposition, taken from the type locality.

Diagnosis. The species differs from all other species of Rhinocricus by the shape of the sternite of the anterior gonopod, relatively small and narrow, with distal end with a small groove and transverse semicircular depression (Fig. 1).

Description. Male, holotype (Figs. 4, 5). With 52 segments. Length 75. Width 7. Clypeus olivaceous with spaced 2–2 supra-labial setae. Labrum yellowish-brown with 15–15 setae. Antennae brown with numerous sensory cones (around 18). Collum grayish-olive with yellowish-brown margins and ventro-lateral rounded borders. Prozonites olivaceous with whitish anterior margins; metazonites olivaceous-brown with yellowish posterior margins; posterior metazonites red-brown. Segments 46–51 with whitish pseudosuture. Epiproct cream with round, yellowish apex, surpassing the paraproct. Paraproct olivaceous. Hypoproct yellowish. Legs dark-brown with elongated coxae at third and fourth pairs of legs. Ocelli black, arranged in five rows in the following numeric order (dorsal to ventral): 9, 8, 7, 5, 4 right and 9, 8, 7, 5, 4 left. Ozopores black, beginning at the sixth segment. Scobinae beginning at eighth segment.

Anterior gonopod (Figs. 1, 2). With subtriangular sternite, longer than wide, with distal small groove and semicircular depression. Sternite shorter than coxite and telepodite. Coxite wide with internal obtuse lobe, shorter than telepodite which has a less accentuated distal lobe.

Posterior gonopod (Fig. 3). Solenomere rounded distally, longer than tibiotarsus. Tibiotarsus lamellate, externally with small salience, internally with sharp and projecting distal end.

Female, paratype (Figs. 6, 7). As the male unless noted. With 51 segments. Length 70. Width 7. Coloration lighter than in male. Labrum with 12–12 setae. Ocelli in five rows in the following numeric order (dorsal to ventral): 9, 9, 8, 7, 5 right and 8, 8, 8, 7, 4 left. First ozopore located below the line of others.

Distribution. Known only from the type locality (Arroio do Tigre, state of Rio Grande do Sul, Brazil).