Dendrocerus laticeps (Hedicke, 1929)

Fig. 4

Atritomellus laticeps Hedicke, 1929: 60.

Lygocerus laticeps (Hedicke) Hellen, 1966: 15.

Dendrocerus laticeps (Hedicke) Dessart, 1972: 186.

Material examined.

China • 2 females; Anhui, Chuzhou, Mingguang; 28.IV.2019; H. Li leg. (AHNU) .

Description.

Female: Body length: 1.8-1.9 mm.

Coloration (Fig. 4): Cranium and mesosoma black, metasoma alutaceous to black. Mouthparts brown or yellow; eyes light brown; ocelli brown. Flagellum black or brown. Basal scape and AIII yellow, with other antennae segments black. Legs usually yellow, sometimes darkened proximally, especially on lateral side of hindlegs. Syntergum yellow to dark brown (Fig. 4G). Pterostigma, costal vein, and radial vein light brown (Fig. 4F). Body pubescence white; marginal fringes of wings brown.

Head (Fig. 4C): Slightly wider than mesosoma (about 1.2 × wider than mesosoma). HH: EHf = 1.8-1.9. HH: HL = 0.8-1.0. HW: IOS = 1.5-1.7. HW: HH = 0.9-1.0. CSB: Mean: 520-600 μm . POL longer than OOL and ocellar triangle with broad base. OOL: LOL = 1.6-1.8. POL: OOL = 1.1-1.2. Broad and pubescence short; head concolorous below and above eye midlevel; mandibles and palps yellow. Facial pit present. Intertorular carina distinct. Eyes usually large. Ocellus triangle broad and short lateral ocelli well separated from eyes. Preoccipital lunula present. Occipital carina strongly developed. Preoccipital furrow present.

Antennae (Fig. 4C): Scape about 1.6 × longer than combined lengths of pedicel and F1. Scape length vs. pedicel length: 4.1-4.8. Scape length vs. F1 length: 2.8-3.3. F1 length vs. pedicel length: 1.5-1.8. F1 length vs. F2 length: 1.2-1.5. Longest flagellomere: F1. F1 longer than F2. Pedicel long. F1 long and thin, about 3 times as long as broad, distal flagellar segments broader, less elongate, with flat area ventrally. F2 sometimes slightly asymmetrical. Scape never completely dark, normally (when viewed dorsally) with distinct light-coloured basal band, but sometimes indistinct. Pubescence rather short.

Mesosoma (Fig. 4): Pronotum not elongate. AscW/PscW = 0.8-0.9. Mesosoma slightly narrow (1.3 × longer than wide) (Length/width/height = 560/420/470 μm); coriaceous in sculpture, densely pubescent. Mesoscutum: (Length/width = 281/300 μm); mesoscutum 1.1 × wider than long, with more or less straight anterior margin. Notauli very distinct but present only anteriorly, disappearing immediately after bend. Median furrow distinct. Lateral axillar area longer than high. Mesopleural sulcus present. Median projection of lateral prodeal carina present. Anterior metanotal margin with conspicuous furrow passing under apex of scutellum. Propodeum with projections posteriorly. Sparsely crenulate furrow. Median propodeal projection weakly developed. Lateral thoracic segments bordered by conspicuous foveolate or crenulate furrows. Posterodoral metapleural area trapezoid-shaped.

Wings (Fig. 4F): Total wing length 1.1 mm. Clear, pubescence long, fringe long and obvious. Prerostigma noticeably semioval, long and thin (Length/width = 130/80 μm). Radius (160 μm), curved a little in the middle and slightly logger (1.2 ×) than pterostigma; forewing densely pubescent and marginal fringes numerous; hindwing without venation.

Metasoma (Fig. 4G): Metasoma lighter than mesosoma. Mesosoma 1.5 × longer than wide (Length/width/height = 560/420/470 μm). Syntergum with crenulate collar, clearly with neck. Rest of metasoma smooth, but with numerous pit-like punctuations in middle and posterior of T3. Several strong transverse gastral carinae present in basal portion of metasoma; gastrocoeli not evident; five terminal segments visible dorsally with numerous hairs.

Distribution.

China (Shandong, Anhui, Jiangsu, Hubei, Fujian, Guangdong, Guangxi); Australasian; Oceanian; Nearctic; Palearctic; Oriental.