Imasega bicolor Li & Xu, 2017

Li, Shuang-Shuang & Xu, Zai-Fu, 2017, First record of Imasega Krombein from China, with description of one new species (Hymenoptera, Chrysididae, Amiseginae), Journal of Hymenoptera Research 54, pp. 71-77 : 72-76

Imasega bicolor Li & Xu sp. n. Figs 1 , 2 , 3-5

Material examined.

Holotype ♂, CHINA: Guangdong, Fengkai, Heishiding Provincial Nature Reserve , 1.X.2003, leg. Ju-jian Chen, No. 20047672 (SCAU) . Paratypes: 1♂, CHINA: Guangdong, Fengkai, Heishiding Provincial Nature Reserve , 1.X.2003, leg. Ju-jian Chen, No. 20047664 (SCAU) ; 1♂, CHINA: Guangdong, Fengkai, Heishiding Provincial Nature Reserve , 1.X.2003, leg. Ju-jian Chen, No. 20047642 (SCAU) ; 1♂, CHINA: Guangdong, Longmen, Nankunshan Provincial Nature Reserve , 2-3.V.2005, leg. Zai-fu Xu, No. 200509614 (SCAU) .

Description.

Holotype. Male. Body length 3.6 mm. Forewing length 2.8 mm. MOL = 2.0 MOD; OOL = 0.8 MOD; POL = 1.7 MOD; MS = 1.7 MOD. Relative length of S:F1:F2:F3 = 1.5:1.6:1.2:1.1.

Head. Head with setulae. Head 1.4 × as wide as distance from clypeal apex to posterior ocelli. Head (except scapal basin) punctate; punctures interspaced by 0.2-1.0 PD. Scapal basin slightly concave, with faint transverse rugulae and smooth longitudinal median ridge. Eye strongly bulging and with dense, erect setulae. Clypeal apex thickened. Mandible with one tooth. MS less than half of eye height. Ocellar triangle obtuse isosceles. Flagellum with dense, oblique setulae; flagellar setulae about half as long as width of flagellar segment; F1 4.5 × as long as wide; F2 3.4 × as long as wide; F3 3.4 × as long as wide; F4 3.7 × as long as wide; F5 3.8 × as long as wide; F6 4.2 × as long as wide; F7 4.3 × as long as wide; F8 4.4 × as long as wide. Occipital carina absent.

Mesosoma. Mesosoma with setulae. Pronotum punctate; punctures interspaced by 0.3-0.6 PD; pronotum with longitudinal median groove on posterior third; pronotum 0.8 × as long as mesoscutum medially; Mesoscutum punctate; punctures interspaced by 0.3-0.6 PD. Notauli incomplete, present posteriorly. Parapsidal lines weakly impressed. Mesoscutellum punctate. Mesopleuron punctate, without scrobal sulcus or omaulus; punctures interspaced by 0.1-0.7 PD. Metanotum punctate, medially 0.8 × as long as mesoscutellum, with triangular median enclosure 0.8 × as long as basal width. Metapleuron mostly smooth. Propodeum with short and blunt posterolateral teeth; posterior and lateral surfaces weakly rugose. Hind coxa without dorsobasal carina. Tarsal claw with large median tooth.

Metasoma. Metasoma with setulae. Metasomal tergites and sternites finely and sparsely punctate; punctures interspaced by 3.0 to 10.0 PD.

Colouration. Body without metallic reflection. Head black. Antenna blackish brown, with scape and pedicel yellowish brown. Mandible yellowish brown, with tooth reddish brown. Clypeus yellowish brown. Pronotum and propleuron yellowish brown. Mesoscutum, mesoscutellum, metanotum and propodeum black. Mesopleuron black, with upper area brown. Metapleuron black. Legs with coxae and trochanters whitish yellow, femora, tibiae and tarsi yellowish brown. Wings hyaline, with stigma and veins brown.

Variations. Paratypes. Body length 3.4-4.1 mm. Head 1.4-1.7 × as wide as distance from clypeal apex to posterior ocelli. F4-F8 3.7-4.4 × as long as wide. Pronotum 0.7-1.0 × as long as mesoscutum medially. Metanotum 0.8-1.1 × as long as mesoscutellum medially.

Female. Unknown.

Biology.

Unknown.

Distribution.

China (Guangdong).

Etymology.

The specific name " bicolor " refers to the colouration of the mesosoma.

Figures

Figure 1. Imasega bicolor sp. n., male, holotype, habitus, lateral view.

Figure 2. Imasega bicolor sp. n., male, holotype, habitus, dorsal view.

Figures 3 - 5. Imasega bicolor sp. n., male, holotype. 3 Antenna 4 Head, frontal view 5 Head and mesosoma, dorsal view.