Rhaconotus robustus Long

Oanh, Nguyen Thi & Long, Khuat Dang, 2019, New species of the Rhaconotusjacobsoni group (Hymenoptera, Braconidae, Doryctinae) from Vietnam, ZooKeys 853, pp. 37-55 : 37

Rhaconotus robustus Long sp. nov. Figs 25, 26-36

Material.

Holotype, male, “Doryc.722” (IEBR), NW Vietnam: Hoa Binh, Mai Chau, Tan Son, orchard, MT, 20°43'10.3"N 104°59'47.0"E, 950m, 1-5.v.2010, KD Long.

Diagnosis.

Antenna with 46 segments (male); occipital carina finely complete medio-dorsally, fading below distal to hypostomal carina above base of mandible (Fig. 27); frons slightly depressed, with sparse fine striae (Fig. 26); vertex and temple shiny, smooth; distance from pronotal carina to mesonotum equal to distance from carina to anterior margin of pronotum; in lateral view, metanotum with short pointed tooth; precoxal sulcus narrow, straight, crenulate (Fig. 30); mesopleuron and metapleuron finely granulate; notauli shallow, sparsely crenulate anteriorly, slightly widened posteriorly, with two longitudinal convergent carinae running close to scutellar sulcus (Fig. 29); propodeum with baso-lateral areas emarginated by carina (Fig. 32); median carina in basal 0.5; pterostigma 4.4 × as long as wide; fore wing vein 3-SR 2.7 × vein r; vein 1-CU1 0.12 × vein 2-CU1 (Fig. 35); second submarginal cell slightly widened apically, basal length 3.1 × its maximum width and 1.6 × subdiscal cell; vein 1-M of hind wing 4.25 × vein 1r-m (Fig. 36); inner side of fore tibia with six spines; hind coxa finely granulate; hind tibia robust, 8.5 × its maximum width; first metasomal tergite nearly parallel-sided, 2.5 × its apical width (Fig. 33), finely granulate basally, longitudinally striate apically; second-fifth tergites longitudinally striate; sixth tergite rugo-striate basally, almost smooth apically (Fig. 31).

Description.

Male, body length 5.9 mm; fore wing length 3.7 mm (Fig. 25).

Head. Antenna with 46 segments; scapus dorsally 1.3 × longer than its maximum width; third antennal segment 1.1 × as long fourth segment; in dorsal view; temple roundly behind eye; head width 1.3 × its median length (Fig. 26); median length of head 1.8 × as long as temple; height of eye 1.3 × temple; in lateral view, transverse diameter of eye 1.2 × length of temple; eye 1.4 × longer than its width (Fig. 27); ocelli small, basal side of ocellar triangle 1.5 × lateral sides; POL 1.5 × as long as OD, and 0.6 × OOL (Fig. 26); in frontal view, eye 2.3 × as high as broad; malar space 0.4 × height of eye, 1.3 × as long as basal width of mandible (Fig. 28); face width 1.1 × height of eye, and 1.3 × height of face and clypeus combined; width of hypoclypeal depression 0.8 × as long distance from edge of depression to eye, 0.4 × as wide as face, and 1.2 × as wide as basal width of mandible; distance between tentorial pits 1.1 × as long as long distance from pit to eye; occipital carina complete, fading below distal to hypostomal carina above base of mandible (Fig. 27); head with long sparse setae, roundly narrowed below eyes (Fig. 26); length of maxillary palp 1.4 × height of head (without mandible); frons slightly depressed medially, with sparse fine striae; vertex and shiny, smooth (Fig. 26); face rugo-coriaceous; clypeus rugose (Fig. 28).

Mesosoma. Mesosoma depressed, its dorsal side almost flat; length 2.1 × its height (Fig. 30); pronotum with median transverse carina; notauli narrow, sparsely crenulate anteriorly, slightly widened posteriorly with two longitudinal convergent carinae running close to scutellar sulcus (Fig. 29); pronotal side almost flat, coriaceous medially, coarsely rugose posteriorly, finely granulate ventrally; precoxal sulcus long, narrow, crenulate; subalar depression largely crenulate; mesopleuron finely granulate (Fig. 30); mesoscutum and scutellum finely granulate; propodeum with baso-lateral areas emarginated by carinae (Fig. 32); median carina in basal 0.5 of propodeum; baso-lateral area finely granulate; propodeal areola rugose.

Wings. Fore wing 4.1 × as long as its maximum width; pterostigma 4.4 × as long as wide; vein r arising behind middle of pterostigma (distance from apex of pterostigma to vein r 0.7 × distance from vein r to base of pterostigma); vein 1-R1 1.2 × as long as pterostigma; vein 3-SR 2.7 × vein r, and 0.6 × vein SR1, and 1.3 × vein 2-SR; vein m-cu distinctly postfurcal; second submarginal cell of fore wing slightly widened apically (Fig. 35), basal length 3.1 × as long as its maximum width, and 1.6 × as long as subdiscal cell; subdiscal cell roundly closed on level of vein m-cu; vein 1-CU1 equal to vein cu-a, and 0.12 × vein 2-CU1 (Fig. 35); hind wing 6.7 × as long as wide; vein M+CU 0.3 × vein 1-M; vein 1-M 4.25 × vein 1r-m (Fig. 36).

Legs. Fore tarsus 1.5 × as long as fore tibia; inner side of fore tibia with six spines; hind coxa with baso-ventral tooth, finely granulate; hind femur robust (Fig. 34), length of hind femur, tibia and basitarsus 2.5, 8.5 and 10.5 × their maximum width, respectively; outer side of hind tibia with long semi-erected setae, length of seta 1.5 × maximum width of tibia (Fig. 34); inner hind tibial spur 0.3 × as long as hind basitarsus; hind tarsus 0.9 × as long as hind tibia; basitarsus 0.8 × as long as second-fifth tarsal segments combined; second tarsus 0.4 × as long as basitarsus, and 1.1 × as long as fifth tarsus (without pretarsus); fourth tarsus 0.6 × fifth tarsus.

Metasoma. Metasoma 1.3 × as long as head and mesosoma combined; first metasomal tergite nearly parallel-sided (Fig. 33); length of first metasomal tergite 2.5 × apical width, and 1.4 × length of propodeum; second metasomal tergite with narrow lenticular apical area separated with shallow crenulate furrow, length of lenticular apical area 0.3 × length of second tergite (Fig. 31); length of second tergite 0.9 × as long as its basal width, and 0.7 × length of third tergite; first metasomal tergite with two dorsal carinae in basal 0.5 of tergite; finely granulate basally, longitudinally striate apically (Fig. 33); second-fifth tergites longitudinally striate; sixth tergite sparsely setose, rugo-striate basally, almost smooth apically (Fig. 31).

Colour. Body black, antenna yellow, but brown apically; scapus brownish yellow; head black with yellow semi-circular stripe around eye dorso-laterally (Fig. 27); palpi brown, except apical segment of labial palp and two apical segments of maxillary palp yellow; fore and middle legs yellow; hind coxa and femur yellowish brown; hind tibia and tarsus yellow; tegula brownish yellow; wing veins pale brown; pterostigma pale brown, cream white basally (Fig. 35); wing membrane hyaline with smoky spots medially.

Female.

Unknown.

Biology.

Unknown.

Etymology.

From robustus (Latin for strong), because of the robust hind femur.