Hypoxys excavatus sp. n.

(Figures 7A–E, 19A–B, 21B)

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Material examined (n=3). Holotype ♂: BRAZIL. Mato Grosso. Chapada dos Guimarães, III.79, O. Roppa & A. Domingos leg. (MNRJ) . Paratypes: BRAZIL. Rondônia: ♀ Ouro Preto do Oeste, sítio Deus é Amor, 20.III.1985, M.F. Torres leg. (MPEG); same data : ♀ 26.III.1985 (MPEG) .

Measurements. Total length: 14.5–16.6; head length: 1.4–1.6; head width: 3.0–3.1; pronotal length: 2.5–3.1; pronotal width: 8.9–9.5; scutellum length: 6.7–7.5; scutellum width: 5.0–5.5; abdominal width: 8.0–8.3; length of antennal segments. I: 0.8–1.0; II: 1.4–1.6; III: 1.0–1.3; IV: 3.5–4.1; V: 4.2–4.5.

Diagnosis. Anterolateral margin of pronotum without black stripe. Anterolateral margin not punctured dorsally. Cicatrices of pronotum with light brown punctures delimiting anterior sulci (Fig. 19A). Scutellum with anterior margin yellow (Fig. 19A). Body ventrally with narrow brown stripes (Fig. 19B). Male genitalia (Fig. 7A–D). Pygophore remarkably excavated laterally (Fig. 7C–D), leaving the parameres visible in lateral view. Dorsal rim rugose and projected posteriorly, surpassing level of posterolateral angles (Fig. 7A). Superior process of genital cup triangular, short, tapering to the base, and close to dorsal rim; visible in dorsal view (Fig. 7A–C). Paramere spatulate; anterior lobe developed and rounded; posterior lobe well-developed and subtriangular; outer margin black; stalk with inner medial carina low, evanescent and curved toward anterior lobe (Fig. 7B–C). Proctiger with dorsolateral tufts of setae clearly separated by medial bridge; posterior face pentagonal with both lateral margins swollen and somewhat ventrally projected (Fig. 7B–C). Ventral rim remarkably projected caudally; medial excavation shallow; expansions slightly tumid, acuminated, and narrow; apices densely setose, surpassing level of posterolateral angles in ventral view (Fig. 7D). Female genitalia (Fig. 7E). Plates with long and sparse setae. Valvifers 8 subtrapezoidal, posterior margin sinuous; inner angles reaching basal third of valvifers 9, not touching each other; inner margins forming a long and narrow drop-like excavation. Valvulae 9 exposed.

Comments. The H. excavatus like H. omegoides, (Fig. 10C–D) and H. boerneri (Nunes et al. 2020, Fig. 2C) has the lateroventral side of the pygophore remarkably excavated, leaving paramere completely exposed laterally (Fig. 7C–D). This condition also gives the impression that ventral rim of the pygophore is strikingly projected caudally, completely different from all other species of the genus. The species H. excavatus and H. omegoides show the lateral margins of the posterior face of the proctiger ventrally projected (Figs. 7B, 10B) (just surpassing the margin in H. excavatus and strongly developed in H. omegoides). Females from H. excavatus and H. boerneri are very similar (Fig. 7E; Nunes et al. 2020, Fig. 2D). The main difference between these species is the median excavation of valvifers 8 in H. excavatus (Fig. 7E) that is narrower with apices of inner angles closer to each other than in H. boerneri .

Etymology. The name refers to the strongly excavated lateral surface of the pygophore.

Distribution (Fig. 21B). BRAZIL: Rondônia, Mato Grosso.