Donaciolagria qiuae, Zhou & Yan & Chen, 2025

Donaciolagria qiuae sp. nov.

( Figs 3A, B View FIGURE 3 , 4B, F View FIGURE 4 )

Type material ( 1 ♂). HOLOTYPE: Vietnam: ♂ ( CNU) ( Figs 3A, B View FIGURE 3 ): 2022-Ⅴ, Northwest of Lai Chau Province, local collector leg.

Diagnosis. Body robust, with elytra strongly convex, pronotum,elytra purple, metafemora bicolor. Donaciolagria qiuae sp. nov. is similar to Donaciolagria xui sp. nov., but can be distinguished by the following characteristics: body longer; pronotum widest at base (pronotum widest across premedian portion and base in D. xui sp. nov.), anterior portions shallowly impressed medially (anterior portions not impressed in D. xui sp. nov.); elytra gently contracted backward (elytra almost parallel-sided in D. xui sp. nov.), portions adjacent to suture strongly impressed in apical 1/3 (portions adjacent to suture strongly impressed to forming a slope in apical 1/5 of D. xui sp. nov.), elytral margins visible in anterior half except for the portions under humeral callosity (elytral margins invisible in anterior half of D. xui sp. nov.).

Description. Holotype ♂ ( Fig. 3A, B View FIGURE 3 ). Body length 12.9 mm, width 4.2 mm. Body robust, shiny, 3.10× as long as wide; head black except for insides of mandibles, with purple luster laterally; pronotum, elytra purple; legs black except for apical 2/3 of metafemora brown; ventral surface purple, but abdominal ventrites yellowish brown with median portions of ventrites 1–3 metallic green, 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, sparse on metaventrite and median 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 slightly arched backward medially, sparsely with minute punctures. Frons uneven, 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 1.60× as long as eye diameter. Antennae filiform, reaching metacoxae when directed backward, antennomere Ⅰ stout, length ratios of antennomeres Ⅰ–XI as 40: 20: 60: 63: 61: 70: 70: 64: 57: 46: 257, antennomere XI greatly lengthened, slightly curved with pointed apex, shorter than the combined length of five preceding antennomeres.

Prothorax glossy, about 0.83× as long as wide, widest at base, wider than head at widest portion, constricted before base. Pronotum convex, impunctate, disc shallowly impressed medially along anterior margin, with a moderately deep, ringent outward impression in each lateral side of posterior half; anterior angles rounded, posterior angles acute, moderately projecting laterally; anterior margin slightly arched backward, posterior margin almost straight with broad elevated carina, lateral portions roundly bending toward ventral surface with the margins invisible in dorsal view. Prosternal process narrow 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, gently contracted backward, 2.12× as long as wide and 4.71× 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 in apical 1/3, elytral tips acute, folded; sutural margins impunctate, slightly elevated; humeral callosity prominent, impunctate, rounded in dorsal view, separated from disc by deep impression; elytral margins visible except for the portions under humeral callosity 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. 4F View FIGURE 4 ); parameres triangularly elongate, with lateral margins slightly curved inward ( Fig. 4B View FIGURE 4 ).

Female unknown.

Distribution. Vietnam: Lai Chau.

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