Yuracarus diamantinus (Bernhauer, 1917) comb. nov.

Figures 1 C, D, 3 A – D, F, 4 C, 5 R – T, 6 D, 7, 8

Philonthus diamantinus Bernhauer 1917: 102, attributed to Fauvel in litteris; Scheerpeltz 1933: 1339 (catalog); Blackwelder 1944: 132 (list); Herman 2001: 2804 (catalog); Chani-Posse et al. 2018: 63 (checklist, “not Philonthus ”); Chani-Posse and Ramírez-Salamanca 2020 a: 199, 210, 211, 213 (phylogeny); Chani-Posse and Ramírez-Salamanca 2020 b: 237 –251 (characters, phylogeny); Ramírez-Salamanca et al. 2020: 151–167 (characters, phylogeny, figures).

Type material.

Lectotype ♂, here designated (Figs 1 C, D), with labels: [old white label printed] “ Yuracaris ”, [old white label printed] “ Bolivien ”, [old white label printed] “ Fauvel det ”, [old white label with Bernhauer’s handwriting] “ diamantinus / fvl. i. l. / Mus. Hamburg ”, [yellow label with Bernhauer’s handwriting] “ diamantinus / Brnh. / Typus ”, [white label printed] “ Chicago NHMus / M. Bernhauer / Collection ”, [purple label printed] “ SYNTYPE / teste D. J. Clarke 2014 / GDI Imaging Project ”, [white label printed] “ FMNHINS / 2819413 / FIELD MUSEUM ”, [blue label printed] “ PHOTOGRAPHED / Kelsey Keaton 2014 / Emu Catalog ”, [red label] “ Lectotype Philonthus / diamantinus Bernhauer 1917 / des. Chani-Posse et al. 2025 ” (FMNH) . One paralectotype ♀ with same data, but yellow label with Bernhauer’s handwriting with “ diamantinus Brnh. / Cotypus ” (FMNH).

Additional material examined.

BOLIVIA: Chapare, Yungas, 29–31.I.76, Bolle, 2900 m, ♂ (CNC) .

Diagnosis.

Yuracarus diamantinus can be identified among other species of Yuracarus by the following combination of characters: antennomeres 8–10 elongate, eyes not longer than half the length of the temples, and the distance separating the medial interocular punctures on the frons not more than 2.0 × distance separating the medial punctures from the lateral punctures.

Redescription.

Body length 10.2–10.3 mm (5.0– 5.2 mm, abdomen excluded), body overall scarcely setose, almost glabrous (Fig. 1 D). — Colouration: Head and thorax metallic green, elytra metallic purple to greenish purple, abdomen shiny black to piceous-black; antennae, palpi and legs piceous to piceous-black. — Head: moderately to slightly longer than wide (HW / HL = 0.8–0.9), as wide as pronotum at widest point (HW / PW = 1.0); epicranium with medial interocular punctures separated by distance 2.5 × as large as distance separating medial punctures from lateral punctures. Eyes half shorter than temples (EL / TL = 0.5) seen from above. Antennae with first antennomere distinctly shorter than second and third combined, third about 1.3–1.4 × as long as second, fourth-tenth longer than wide. Labial palpus with third palpomere 1.5 × as long as second (Fig. 3 A). Maxillary palpus with fourth palpomere (apical) 1.3–1.4 × as long as third (Fig. 3 A). Neck about 0.4 × as wide as head at widest point. — Pronotum: distinctly to moderately longer than wide (PW / PL = 0.7–0.8), dorsal rows of punctures each with 4 punctures. — Legs: Mesotarsi shorter than mesotibiae, metatarsi shorter than metatibiae, first metatarsomere shorter than fifth (S 1 / S 5 = 0.8–0.9). — Elytra: at sides moderately to distinctly longer than pronotum at midline (EtL / PL = 1.2–1.3). — Male sexual characters: Sternum 8 deeply emarginate medio-apically. Aedeagus with median lobe gradually narrowed from base into rather acute apex, internal sac with one pair of elongate and sclerotized structures (Fig. 6 D). — Female sexual characters: As described for the genus, with tergum 10 truncate apically (Fig. 5 R), accessory sclerite horseshoe-shaped (Fig. 5 T).

Geographical distribution.

Yuracarus diamantinus is currently recorded only from the Andes of Bolivia, at elevations ranging from approximately 2000 m to 2900 m (Fig. 7).