Homalotylus bicolor Zu, 2023

Zu, Guohao, Xue, Hao, Wang, Haiyang, Zhen, Wenquan & Huang, Dawei, 2023, Description of three new species and new distributional data for three species of Homalotylus (Hymenoptera, Encyrtidae) from China, ZooKeys 1184, pp. 273-289 : 273

Homalotylus bicolor Zu sp. nov.

Figs 1-6 , 7-12

Type materials.

Holotype. ♀ [on slide], China, Guangxi Province, Qinzhou City, Beibu Gulf University, 21°53'53"N, 108°36'56"E, c. 24 m, 06-26.X.2019, Wen-Quan Zhen, Malaise trapping. Paratypes. ♀♂ [on slides], China, Guangxi Province, Qinzhou City, Beibu Gulf University, 21°53'53"N, 108°36'56"E, c. 24 m, 06-13.X.2019, Wen-Quan Zhen, Malaise trapping.

Description.

Female. Holotype. Length, 2.20 mm (excluding ovipositor). Head generally orange yellow, with genae, frontovertex and occiput dark brown. Antennae dark brown, F4 mostly white with lower margin brown, F5, F6 and clava white. Mesosoma dark brown with shallow metallic green sheen, scutellum mostly orange yellow, only with a brown area at base; legs dark brown, except for apical 3/5 of mid tibia, mid tibial spur, mid and hind tarsus 1-4 white. Metasoma dark brown.

Head (Fig. 1 ) with numerous conspicuous setae on frontovertex, each about as long as diameter of posterior ocellus. Head in front view 1.16 × higher than wide. Frontovertex 0.22 × head width. Ocelli forming an angle of 33°, posterior ocelli close to eye margin, distance to occipital margin 1.50 × the diameter of anterior ocellus. Malar space 0.18 × eye height. Antennal torulus with its dorsal margin slightly below lower eye margin and very close to oral margin, and the distance of antennal torulus by 1.95 × its own height. Antennal (Fig. 2 ) scape slender, 8.42 × as long as wide; pedicel 2.5 × as long as wide, 1.5 × as long as F1; all funicle segments longer than wide, F1 1.57 × as long as wide, F6 1.11 × as long as wide; funicle with linear sensilla on all segments; clava 3-segmented, 3.40 × as long as wide, and as long as F4-F6 combined, apex strongly obliquely truncate, truncate part approach to the base of the clava. Measurements (μm): HH, 580; HW, 500; FV, 108; EL, 490; MS, 88; OD, 38; POL, 38; OCL, 58; AOL, 78; length and (width)-radicle, 105; scape, 400 (48); pedicel, 125 (50); F1, 83 (53); F2, 70 (55); F3, 75 (58); F4, 73 (60); F5, 70 (63); F6, 70 (63); clava, 213 (63).

Mesosoma (Fig. 3 ) with sculpture on dorsum similar to that on frontovertex but that on mesoscutum a little shallower; notaular lines conspicuous but not quite meeting at middle of posterior margin of mesoscutum. Mesoscutum 0.72 × as long as wide; scutellum 0.94 × as long as wide. Fore wing (Fig. 4 ) 2.65 × as long as wide; linea calva interrupted by 4 lines of setae and closed by 5 lines of setae posteriorly; marginal vein 0.44 × as long as stigmal vein, and about half the length of postmarginal vein. Hind wing (Fig. 5 ) 3.73 × as long as wide. Length of mid tibial spur (Fig. 6 ) 0.48 × of mid tibia and longer than mid basitarsus. Measurements (μm): FWL, 1325; FWW, 500; SMV, 600; MV, 50; PMV, 100; SV, 113; HWL, 970; HWW, 260; MT, 810; mid tibial spur, 390; mid basitarsus, 360.

Ovipositor (Fig. 3 ) 1.26 × as long as mid tibia, distinctly exserted. Measurements (μm): OL, 1020.

Male. Length, 1.67 mm. Color is similar to female, except for F4 completely brown.

Head (Fig. 7 ) in front view 1.11 × higher than wide. Frontovertex 0.23 × head width, ocelli forming an angle of about 35°. Malar space 0.17 × eye height. Antennal torulus with its dorsal margin slightly below lower eye margin and very close to oral margin. Antennal (Fig. 8 ) scape slender, about 5.9 × as long as wide; pedicel 2.18 × as long as wide, 1.40 × as long as F1; all funicle segments longer than wide; clava unsegmented, 3.72 × as long as wide.

Mesoscutum (Fig. 9 ) 0.58 × as long as width; scutellum 0.9 × as long as width. Fore wing (Fig. 10 ) 2.65 × as long as width. Hind wing (Fig. 11 ) 3.86 × as long as width. Length of mid tibial spur (Fig. 12 ) about 0.44 × of mid tibia and longer than mid basitarsus.

Aedeagus (Fig. 9 ) about 1.34 × as long as mid tibia.

Host.

Unknown.

Etymology.

The specific name refers to its coloration of mesosoma.

Diagnosis.

The new species may be distinguished from H. scutellaris Tan & Zhao, 1997 and H. mundus Gahan, 1920, by the following characters: scape 8.42 × as long as wide (6 × in H. scutellaris ), clava 3-segmented (unsegmented in H. scutellaris ), metanotum and propodeum dark brown (yellow brown in H. scutellaris ); F4 mostly white, mixed with brown on lower margin (completely white in H. mundus ), axillae brown (pale orange yellow in H. mundus ), pedicel 2.5 × as long as wide (nearly 3 × in H. mundus ).

Figures

Figures 1 - 6. Homalotylus bicolor Zu, sp. nov., holotype female 1 head 2 antenna 3 mesosoma and metasoma 4 fore wing 5 hind wing 6 legs. Scale bars: 100 μm.

Figures 7 - 12. Homalotylus bicolor Zu, sp. nov., paratype male 7 head 8 antenna 9 mesosoma and metasoma 10 fore wing 11 hind wing 12 legs. Scale bars: 100 μm.