Dolichurus nigrilamellatus Bai & Li, 2025

Dolichurus nigrilamellatus Bai & Li sp. nov.

Fig. 3 A – I View Figure 3

Type material.

Holotype. China • ♀; Guangdong Province, Shaoguan City, Nanling Nature Reserve, Scale Frame ; 24°54′45.81′′N, 113°2′33.64′′E; 844 m a. s. l.; 22.IX-13.X.2020, collected by Institute of Zoology, Guangdong Academy of Sciences; malaise trap GoogleMaps . China • 1 ♀; Jiangxi Province, Ganzhou City, Jiulian Nature Reserve, Wudang Town, Chunhui Farm ; 24°36′13.18′′N, 114°42′18.88′′E; 467 m a. s. l.; 7.VI.2021, collected by Yongying Ruan; light trap GoogleMaps .

Diagnosis.

The new species is similar to D. aposanus Tsuneki et al., 1992 , but differs from it and other congeners by the following characters (characters of D. aposanus in parentheses): 1) frontal line weak, frons with dense rugae converging toward midline above lamella (frontal line absent, frons sparsely punctate); 2) inner margin of mandible bidentate (inner margin of mandible tridentate); 3) A 3 / aW = 4, A 12 / bW = 4.2 (A 3 / aW = 4.5, A 12 / bW = 6.0); 4) eyes: gena = 29: 15 (eyes: gena = 34: 10); 5) sternaulus present (sternaulus absent); and 6) posterior margin of T 1 - T 3 tiny puncture-rows absent medially (posterior margin of T 1 - T 3 with complete tiny puncture-rows).

Description.

Female. Body length 12.3-12.9 mm. Black, apical margin of lamella dark brown. Mandible ferruginous-orange; maxillary and labial pale brown. Tegula dark brown. Inner surface of fore tibiae apically light yellowish brown, tarsi brown. Wing hyaline and iridescent, veins and stigma brown (Fig. 3 E View Figure 3 ). Vestiture with silvery pubescence; most of frons and vertex with silvery erect pubescence; side of lamella and frons below lamella with appressed silvery pubescence, mandible with yellow erect macrochaetae. Gaster smooth, practically impunctate; S 1 covered with dense silvery setae. Long black bristles on clypeus 4, on frons 4, on pronotum 2 and on scutellum 4 (Fig. 3 A, B View Figure 3 ).

Head. In front view, nearly subcircular in outline, HW: HL = 97: 87. Mandible broad, acute apically, inner margin bidentate. Clypeus smooth, convex medially, conspicuous median carina reaching subapical region practically, apical lobe truncate, base width: middle width: apical width = 13: 50: 10 (Fig. 3 D View Figure 3 ). Antennae 12 segments, scape with very weak ventral carina. Relative length of antennal segments I: II: III: IV: V: VI; VII: VIII: IX: X: XI: XII = 32: 7: 32: 32: 32: 30: 27: 25: 25: 23: 21: 21. A 3 / aW = 4.0, A 12 / bW = 4.2. Lamella parallel on both sides, apical margin thickened, length: width = 27: 25. Frontal line weak, frons with dense rugae converging toward midline, mixed with large punctures; remainder smooth. Inner margins of eyes slightly convergent above, IODv: IODc = 42: 51. POD: OD: OOD = 8: 4: 13, both side of ocelli with tiny punctures (Fig. 3 D View Figure 3 ). In dorsal view, vertex shiny, scattered with tiny punctures, slightly arched above eyes (Fig. 3 F View Figure 3 ). In lateral view, eyes: gena = 29: 15 (Fig. 3 C View Figure 3 ).

Thorax. Pronotum smooth, scattered with tiny punctures, without transverse carina anteriorly, anteriorly densely punctate, pronotal tubercle slightly raised, hardly projects over level of scutum (in lateral view), median impression shallow, pronotal lobe with conspicuous rugae (Fig. 3 C, F View Figure 3 ). Scutum and scutellum shiny, scattered with tiny punctures (Fig. 3 F View Figure 3 ). Mesopleuron coarsely rugose, scrobal sulcus conspicuous, depressed, sternaulus consisting of rough large punctures (Fig. 3 C View Figure 3 ). Metanotum with longitudinal rugae (Fig. 3 G View Figure 3 ). Dorsal surface of propodeum with four longitudinal carinae, including two longitudinal carinae, and two oblique, longitudinal carinae located further out to sides (Fig. 3 G View Figure 3 ). Posterior surface of propodeum with radiating reticulation, lateral margin with blunt tooth halfway from dorsum (Fig. 3 H View Figure 3 ). In lateral view, dorsal surface and posterior surface forming obtuse angle, lateral surface of propodeum with oblique carinae (Fig. 3 C View Figure 3 ). Dorsal surface of mid and hind tibiae with two rows of parallel spines, ventral surface of tarsi with two rows of parallel spines (Fig. 3 A View Figure 3 ).

Gaster. Six segments visible. LT 1: WT 1 = 45: 76. Lateral side of T 1 with conspicuous longitudinal carinae. Lateral margin of terga with few tiny punctures, S 4 and apical margin of S 5 - S 6 with tiny punctures, remainder smooth (Fig. 3 A, I View Figure 3 ).

Distribution.

China ( Guangdong, Jiangxi).

Etymology.

The specific name nigrilamellatus is derived from the Latin stem nigr - (= black) and the Latin word lamellatus (= lamella), which refers to the lamella being black in the female.