Donaciolagria xui, Zhou & Yan & Chen, 2025

Donaciolagria xui sp. nov.

( Figs 3C, D View FIGURE 3 , 4D, H View FIGURE 4 )

Type material ( 1 ♂). HOLOTYPE: CHINA: Yunnan: ♂ ( CNU) ( Fig. 3C, D View FIGURE 3 ): 2013-Ⅴ-23, Gongshan Dulong and Nu Autonomous County: Dulongjiang Town , Alt. 1500 m, Hao Xu & Jian-Yue Qiu leg.

Diagnosis. Body robust, with elytra strongly convex, elytra hyacinthine, metafemora bicolor. Donaciolagria xui sp. nov. most resembles D. qiuae sp. nov., and the diagnostic features distinguishing them are detailed in the “Diagnosis” section of D. qiuae sp. nov.

Description. Holotype ♂ ( Figs 3C, D View FIGURE 3 ). Body length 11.7 mm, width 4.1 mm. Body robust, shiny, about 2.83× as long as wide; head metallic blue, with maxillary palpus, labrum and antennae black; pronotum purple, strongly shiny; elytra hyacinthine; femora atropurpureus with apical 2/3 of metafemora brown, tibia and tarsi black; ventral surface purple, but abdominal ventrites yellowish brown with midlateral portions of ventrite 1, median portions of ventrites 2–3 atropurpureus, prosternum with blue 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, ventral surface with short setae, very sparse on metaventrite and median portions of abdominal ventrites.

Head elongate, widest at eye level. Mouthparts strongly protruding forward; terminal maxillary palpus triangularly elongate with slightly arched, cavate inner surface, broadest at basal 1/5; 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 almost straight, sparsely with minute punctures. Frons densely and coarsely punctate, with anterior portion gently elevated, broadly separated from epistome by arched forward fronto-epistomal impression; frontal canthus swelling, impressed in basal half, respectively projecting anterolaterally. Vertex impunctate. Eyes bulging, with anterior margin moderately invaded by frontal canthus, interocular distance about 1.86× as long as eye diameter. Antennae filiform, reaching metacoxae when directed backward, antennomere Ⅰ stout, length ratios of antennomeres Ⅰ–XI as 41: 21: 59: 54: 66: 60: 64: 55: 52: 47: 247, antennomere XI greatly lengthened, slightly curved with pointed apex, shorter than the combined length of five preceding antennomeres.

Prothorax glossy, 0.80× as long as wide, widest across premedian portion and base, distinctively wider than head at widest portion, projected laterally behind apical margin, constricted before base. Pronotum convex, impunctate, with a moderately deep, ringent outward impression in each lateral side of posterior half; anterior angles never processed, posterior angles acute, moderately projecting laterally; anterior margin arched backward with quite thin carina, posterior margin almost straight 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 strongly convex, almost parallel-sided, 2.03× as long as wide and 4.81× as long as prothorax; surface sparsely punctate, with irregular and fine punctures separated by interspaces 4 to 7× puncture diameter, portions adjacent to suture strongly impressed to forming a slope in apical 1/5, elytral tips acute, folded; sutural margins impunctate, not elevated; humeral callosity prominent, impunctate, rounded in dorsal view, separated from disc by deep impression; elytral margins invisible in anterior half and folded elytral tips; epipleura almost 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.

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

Female unknown.

Distribution. China: Yunnan.

Etymology. The species epithet is dedicated to Dr Hao Xu, the renowned Chinese entomologist in Scarabaeidae , Cetoniinae , who provides substantial support with Lagriini specimens and invaluable suggestions in our taxonomic research of Lagriini .