Gracilaclopus caceresi Ocampo & Mondaca, new species

(Figs. 8–9, 24, 31)

Diagnosis. This species is distinguished from the other species of Gracilaclopus by the following combination of characters: labral apex deeply indented in middle; head black, body light brown with scutellum same color as elytra (light brown); pronotum with a transversal row of setae in middle on each side of disc, setae sparse, long; size <5 mm; male genitalia as Fig. 24.

Description. Holotype male. Length 4.07 mm, width 1.57 mm. Color: Head black, pronotum and elytra light brown; legs, antennae, and mouthparts brown; ventral surface brown. Head (Fig. 8): Frons flat on apical half, convex at base, surface sparsely punctate, glabrous. Clypeus strongly transverse; lateral margins oblique; anterior margin straight, slightly reflexed, frontal area of anterior margin oblique; frontoclypeal suture obsolete, surface densely punctate. Labral shape subrectangular in dorsal view apex strongly indented in middle, strongly reflexed, glabrous. Pronotum (Fig. 9): Surface sparsely punctate, with one row of sparse setae on each side of disc; setae long, slender. Marginal bead present in all margins, reduced on posterior margin at middle. Anterior angle nearly right-angled; posterior angles broadly rounded. Scutellum: Triangular, apex rounded, surface punctate at base, smooth at apex. Elytra: Surface punctate, punctures sparse, setose, setae moderately long. Legs: Mesotibiae and metatibiae with two transverse carinae. Mesotibial and metatibial apex with fringe of spine-like setae. Male genitalia (Fig. 24): Parameres las long as phallobase, curved at middle; apex rounded not club-like.

Type material: Holotype male at IAZA labeled: “ ARGENTINA: San Juan / Salinas de Mascasín. 423 m / S 31°25’39”, W 67°04’05” / XII-12-2003. F. C. Ocampo”; “ Gracilaclopus / caceresi / Ocampo & Mondaca / HOLO- TYPE ” (red label). Paratypes (all male). Seventeen paratypes (11 at IAZA [three in 95% Et-OH], three FVMC, three JMEC) labeled as holotype except: “ Gracilaclopus / caceresi / Ocampo & Mondaca / PARATYPE ” (yellow label).

Type locality. Argentina, San Juan, Salinas de Mascasín (31°25’39”S, 67°04’05”W).

Etymology. We take great pleasure in naming this species after senior author’s friend José María Cáceres.

Distribution (Fig. 31). ARGENTINA. San Juan: Salinas de Mascasín (18).

Temporal distribution. December (18).