Donaciolagria loongi, Zhou & Yan & Chen, 2025

Donaciolagria loongi sp. nov.

( Figs 1A, B View FIGURE 1 , 2 View FIGURE 2 , 4A, E View FIGURE 4 )

Type material (4 ♂, 10 ♀). HOLOTYPE: CHINA: Xizang: ♂ ( CNU, the left hind leg and right metatarsomeres III–IV missing) ( Fig. 1A, B View FIGURE 1 ): 2023-Ⅴ-8, Zayü County: Shangzayü Town: Tiyu Village , Alt. 1744 m, Xing-Long Bai & Quan-Yu Ji leg. PARATYPES: CHINA: Xizang: 1 ♂, 1 ♀: 2023-Ⅴ-11, Zayü County: South of Shangzayü Town, Alt. 1891 m; 2 ♂, 6 ♀: 2023-Ⅴ-13, Mêdog County : 80k (location names derived from the remaining distance (kilometers) to Bomi County seat along the Mêdog-Bomi rode), Alt. 2088 m; 2 ♀ ( Fig. 2A, B View FIGURE 2 ): the same data as holotype; 1 ♀: 2023-Ⅴ-10, Zayü County : Shangzayü Town : Northwest of Bida Village , Alt. 1992 m (all paratypes collected by Xing-Long Bai & Quan-Yu Ji, and preserved in CNU) .

Diagnosis. Body moderately wide, legs bicolor. Pronotum broad, impunctate, widest across premedian portion and base, with a shallow, round impression in each lateral side of posterior half. Donaciolagria loongi sp. nov. resembles Donaciolagria regia Telnov, 2022 . However, the new species exhibits distinctively different coloration, wider body, as well as coarser and denser elytral punctures. D. loongi sp. nov. shares similarities with Donaciolagria quanyui sp. nov., the diagnostic features distinguishing them are detailed in the “Diagnosis” section of D. quanyui sp. nov. D. loongi sp. nov. also resembles Donaciolagria kurosawai (Masumoto, 1988) , but the new species has rounded anterior angles (acute in D. kurosawai ) and different coloration ( Telnov 2022a).

Description. Holotype ♂ ( Figs 1A, B View FIGURE 1 ). Body length 15.1 mm, width 4.5 mm. Body elongate, shiny, about 3.36× as long as wide; head metallic green, but maxillary palpus, anterior margin of labrum, antennae yellowish brown, with apical portions of terminal maxillary palpus, antennomere Ⅰ, antennomeres Ⅴ–Ⅹ darker; pronotum turquoise with yellowish brown posterior margin and angles; elytra longitudinally metallic green, but elytral margins, lateral margins, stripes along suture, sutural margins yellowish brown, humeral callosity blue with purple luster; legs yellowish brown except for black posterior portion of femora, tibia lighter in basal 2/3; ventral surface entirely yellowish brown except for green head (gula excluded), metepisternum, midlateral portions of ventrite 1, with green luster. Dorsal surface nearly glabrous, with few long setae scattered on labrum, mandibles, epistome, tempora and apical portion of elytra; anterior and posterior margins of pronotum, tibiae and tarsi, lateral portions of abdominal ventrites, posterior margin of ventrite 5 with short setae.

Head elongate, widest at eye level. Mouthparts strongly protruding forward; terminal maxillary palpus triangularly elongate with slightly arched, cavate inner surface, broadest at basal 1/4; mandibles robust, bending inward, embracing labrum; labrum transversely cordiform, widest before apical margin, slightly emarginate anteriorly; labro-epistomal membrane exposed, trapezoidal, widest at base; epistome elevated, higher than labrum, transversely rectangular with anterior margin slightly arched backward medially, sparsely with minute punctures. Frons flattened between eyes, densely and coarsely punctate, with anterior portion gently elevated, broadly separated from epistome by arched forward fronto-epistomal impression; frontal canthus swelling, respectively projecting anterolaterally. Vertex impunctate. Eyes slightly bulging, with anterior margin moderately invaded by frontal canthus, interocular distance about 1.66× as long as eye diameter. Antennae filiform, reaching metacoxae when directed backward, antennomere Ⅰ stout, length ratios of antennomeres Ⅰ–XI as 46: 27: 65: 65: 71: 72: 72: 62: 65: 47: 272, antennomere XI greatly lengthened, slightly curved with pointed apex, shorter than the combined length of five preceding antennomeres.

Prothorax glossy, about 0.94× as long as wide, widest across premedian portion and base, distinctively wider than head at widest portion, constricted before base. Pronotum convex, impunctate, with a shallow, round impression in each lateral side of posterior half; anterior angles rounded, posterior angles acute, moderately projecting laterally; anterior margin almost straight with narrow elevated carina, posterior margin slightly arched forward with broad elevated carina, lateral portions roundly bending toward ventral surface with the margins invisible in dorsal view. Prosternal process thin and elevated between coxae, but not high as coxae, expanded backward, roundly triangular posteriorly.

Scutellar shield triangular, with straight lateral sides, impunctate. Elytra moderately wide, convex, gently contracted backward, 2.29× as long as wide and 4.47× as long as prothorax; surface with irregular and coarse punctures separated by interspaces 0.5 to 3× puncture diameter, punctures sparser in basal 1/5, portions adjacent to suture longitudinally flattened in apical 3/5; sutural margins impunctate, not elevated; humeral callosity prominent, glossy, sparsely with few punctures posteriorly, rounded in dorsal view, separated from disc by deep impression; elytral margins distinct, visible in dorsal view except for the portions beneath humeral callosity; epipleura impunctate, narrow, gradually narrowing toward apex. Metaventrite emarginate apically, elevated, higher than metacoxae, projecting upward before apex and subulate.

Legs slender; femora slightly clavate, almost impunctate, except for few minute scattered punctures; metatibiae slightly flattened in posterior 1/3, with distinct, acute carina along inner margin; metatarsomere Ⅰ longest, about as long as metatarsomeres II–IV combined (metatarsomeres III–IV of the holotype missing, data from male paratypes).

Abdominal ventrites almost impunctate, with very fine and sparse punctures in lateral portions; ventrite 6 visible. Aedeagus curved in basal 1/ 3 in lateral view ( Fig. 4E View FIGURE 4 ); parameres triangularly elongate, with lateral margins slightly contracted before base ( Fig. 4A View FIGURE 4 ).

Female ( Fig. 2A, B View FIGURE 2 ). Body length 14.7 mm, width 4.8 mm. Ventral surface entirely yellowish brown except for green head (gula excluded), prothoracic hypomeron, mesepimeron, metepisternum. Body wider, antennae and antennomere XI shorter, length ratios of antennomeres Ⅰ–XI as 41: 22: 50: 60: 65: 60: 63: 57: 53: 46: 189, antennomere XI shorter than the combined length of four preceding antennomeres, frons sparsely punctate, interocular distance about 2.06× as long as eye diameter, prothorax about 0.91× as long as wide, elytral length 2.17× as long as width.

Measurement. Male: body length 13.4–15.1 mm, body width 3.9–4.5 mm (n = 4); female: body length 14.7– 16.3, body width 4.8–5.0 mm (n = 10).

Variability. This new species exhibits variable coloration, primarily on the pronotum. Some specimens has the turquoise pronotum with yellowish brown posterior margin and angles, as shown in the holotype ( Fig. 1A View FIGURE 1 ). While others display a purple pronotal disc ( Fig. 2C View FIGURE 2 ), and some feature an entirely yellowish brown pronotum with the exception of dark impressions ( Fig. 2D View FIGURE 2 ).

Distribution. China: Xizang.

Etymology. The species epithet is dedicated to Dr Xinglong Bai in acknowledgment of his substantial support to Lagriini specimens, including all materials of D. loongi sp. nov. and D. quanyui sp. nov.