Thoreyella cornuta Berg, 1883

(Figs. 3, 15, 20, 25, 30, 34–37, 50–52, 63, 68, Table I)

Thoreyella cornuta Berg, 1883: 215 (descr.); Berg 1884: 31 (descr.); Kirkaldy 1909: 137 (cat.); Pirán 1956: 31 (citation); Rolston, 1984: 830 (Lectotype des.); Rider 1994: 218 (citation); Coscarón & Grazia 1996: 109 (cat.); Grazia & Schwertner 2008: 234 (list); Bernardes et al. 2009: 3, 4, 8–11, 13–16, 18, 21, 22 (classification, distr., fig.).

Diagnosis. Head darker than rest of body. Juga short, measuring one third the length of buccula in lateral view. Humeral anglesdeveloped in long spines directed anterodorsally. Pronotal disc divided by a transverse callus, anterior half lighter in color. Sternum black. Spine at apex of femur long andacute, obliquelydirected. Spiracles black. Processes of ventral rim of pygophore with 2+2 teeth on posterior margin, the former tooth triangular, obtuse, secondpair with less than half the length and partially covered by the first. Posterolateral anglesnot excavate, concavity occupying almost one third of the ventral rim processes width. Gonocoxites 8 with a well-developed cusp.

Redescription. General color dark brown to green, dorsum darker than venter. Head darker than therest of the body, densely punctured with black. Cicatrices between eyes and ocelli elliptical, clear than the remainder of the head. Rare punctures on antenniferous tubercles. Pronotal disc yellowish-brown before transverse callus, darker after callus. Base of scutellum with ferrugineous punctures; apices of clavus with a small black macula. Propleura with two black macula. Mesoepimerum with a black macula at lateroposterior margin. Sternum black. Spiracles black.

Ovate. Juga measuring one third the length of buccula in lateral view, juxtaposed, slightly concave at apex, lateral margins subparallel; apex of head truncate. Frons and vertex swollen. Anteriortooth of buccula directed laterad.Antennal segments: I<II≥III<IV<V. Humeralangles robust, directed anterodorsally; transverse callus of pronotum sinuous, reaching humeral angles. Scutellum triangular, almost as wide as long, attaining abdominal segment VI. Corium slightly surpassing scutellum, also attaining abdominal segment VI. Spines at apex of femur acute, longer than half width of femur, directed obliquely, more developed on posterior legs. Abdominal spine attaining second coxae. Connexivum more exposed on females.

Male genitalia (Figs. 15, 20, 25, 30, 34–37, 50–52). Pygophore. Process of the ventral rim with 2 + 2 teeth on posterior margin, the former tooth triangular, obtuse, obscuring the second pair, with less than half the size of the former pair. Posterolateral angles angulated, concavity occupying almost one third of the width of the ventral rim process. Sutural margins of ventral rim processes posteriorly parallel. Posterior margin of the infolding of ventral rim in open “V”. Parameres (Figs. 34–37) withapical portion bilobate; dorsal width of apical portion (Fig. 34, ap) with twice the width of basal portion (Fig. 34, bp). Phallotheca (Fig. 50, ph) with posteroventral opening. Processus phallothecae (Fig. 50, pp) pyramidal. Vesica (Fig. 50, v) as long as conjunctiva (Fig. 50, c). Secondary gonopore (Fig. 50, sg) opening between conjunctival lobes.

Female genitalia (Figs. 63, 68). Laterotergites 8 concave at base and flat at apex. Gonocoxites 8 obovate, sutural margins convex and forming astout cusp; posterior margins sinuous, concavity adjacent to the cusp. Laterotergites 9 with lateral half moderately elevate, forming a convex carina, median half flat; apical third concave, apex emarginated. Capsula seminalis process (Fig. 68, csp) slightly curved, with one and half times longer than the capsula length (Fig. 68, cs). Posterior annular flange larger than anterior annular flange. Anterior portion of vesicular area curved more sclerotized than the posterior portion; no constriction between these portions (Fig. 68, apva).

Measurements in Table I.

Distribution. BRAZIL: Mato Grosso and Rio Grande do Sul [new record]; ARGENTINA: Entre Rios and Buenos Aires; URUGUAY.

Material examined. Holotype male, with thelabels: a) Typus, b) Banda Oriental, c) 1409, d) Lectotype (top) Paralectotype Thoreyella cornuta Berg, (MLPA) [male and female mounted in the same pin]; Paralectotypes male, 2 females: a) Typus, b) Banda Oriental, c) 1409, (MLPA). BRAZIL. Rio Grande do Sul: Viamão, Morro do Côco, 19.II.1962, 2 females (UFRG); Viamão, Belém Novo, 7.I.1985, M. Sobral col., male (UFRG) . URUGUAY. Banda Oriental, (31), “Cum typo comparat”, Ex. Coll. Bergiana, male (MACN) . ARGENTINA. Buenos Aires: nº 4640, without data, male (MACN); Buenos Aires, San Fernando, without data, n° 28955, 2 males (MACN) .

Comments. This species shares with T. taurus the black sternum in both sexes, a unique character among species of Thoreyella, and with T. paraiba sp. nov. the juga three times shorter than buccula. Thoreyella cornuta, like T. taurus and T. paraiba sp. nov., can be distinguished from the remaining species by the head darker than the body.