Rhaconotus directus 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 directus Long sp. nov. Figs 1, 2-12

Material.

Holotype, female, “Doryc.035”, (IEBR), NW Vietnam: Hoa Binh, Mai Chau, Pa Co, forest, 1100 m, 26.iv.2002, KD Long.

Diagnosis.

Occipital carina complete medio-dorsally, obliterated below and not fused with hypostomal carina (Fig. 3); frons almost flat, finely granulate; vertex and temple finely granulate; distance from pronotal carina to mesonotum equal to distance from carina to anterior margin of pronotum; in lateral view, metanotum with long pointed tooth (Fig. 5a); precoxal sulcus long, narrow, crenulate (Fig. 5); mesopleuron and metapleuron finely granulate; notauli shallow, sparsely crenulate anteriorly, widened posteriorly, with median crenulate depression (Fig. 6); propodeum with median carina in basal 0.3; pterostigma 4.5 × as long as wide; fore wing vein 3-SR 5.0 × vein r; vein 1-CU1 very short, nearly quadrate; vein cu-a almost interstitial (Fig. 10); second submarginal cell parallel-sided, basal length 2.9 × its maximum width and 0.9 × subdiscal cell (Fig. 10); vein 1-M of hind wing 6.3 × vein 1r-m (Fig. 11); inner side of fore tibia with four spines; hind coxa finely and densely granulate; hind tibia 7.7 × its maximum width; first metasomal tergite gradually widened from base to apex, 2.4 × its apical width (Fig. 8); second tergite with lenticular apical area weakly delineated with shallow furrows (Fig. 8); second-third tergites coarsely longitudinally striate; fourth-fifth tergites longitudinally striate basally, finely striate apically; sixth tergite with semi-circular striae in its apical half.

Description.

Female, body length 5.4 mm; fore wing length 4.5 mm; ovipositor sheath 3.4 mm (Fig. 1).

Head. Antenna incomplete, with 45 segments remaining; scapus length dorsally 1.8 × as long as its maximum width; third antennal segments 1.1 × as long fourth segment; in dorsal view, temple roundly narrowed behind eye; head width 1.3 × its median length; median length of head 3.0 × as long as temple; height of eye 1.9 × temple (Fig. 2); in lateral view, transverse diameter of eye 1.4 × length of temple (13: 9); eye length 1.4 × its width (18: 13) (Fig. 3); ocelli small, basal side of ocellar triangle 1.5 × lateral sides; POL 1.5 × OD and 0.5 × OOL (Fig. 2); in frontal view, eye 2.1 × as high as broad; malar space height 0.5 × height of eye, and 1.3 × basal width of mandible; face width 1.3 × height of eye, and 1.8 × height of face and clypeus combined (Fig. 4); hypoclypeal depression width 1.3 × as long distance from edge of depression to eye, 4.0 × as wide as face, and 1.6 × as wide as basal width of mandible; distance between tentorial pits 1.5 × as long as long distance from pit to eye; occipital carina complete medio-dorsally, obliterated below and not fused with hypostomal carina above base of mandible (Fig. 3); length of maxillary palp 1.45 × height of head (without mandible); frons almost flat, finely granulate; vertex and temple finely granulate; face setose, granulate (Fig. 4).

Mesosoma. Distance from pronotal carina to mesonotum equal to distance from carina to anterior margin of pronotum; length of mesosoma 2.9 × its height (Fig. 5); in lateral view, metanotum with long pointed tooth (Fig. 5a); pronotal trough crenulate anteriorly, with transverse striae posteriorly; precoxal sulcus long, narrow, crenulate (Fig. 5); mesopleuron and metapleuron finely granulate; mesoscutum finely granulate; notauli shallow, sparsely crenulate anteriorly, widened posteriorly with crenulate depression (Fig. 6); scutellar depression 0.4 × as long as scutellum; scutellum finely granulate (Fig. 6); propodeum with lateral carinae, median carina in basal 0.3 of propodeum (Fig. 12); propodeum almost finely granulate; apex of propodeum with 2-3 transverse rugosities (Fig. 12).

Wings. Fore wing 4.35 × as long as its maximum width; pterostigma 4.5 × as long as wide; vein r arising from middle of pterostigma; vein 1-R1 1.2 × as long as pterostigma; vein 3-SR 5.0 × vein r, and 0.5 × vein SR1, and 1.4 × vein 2-SR; vein m-cu postfurcal; second submarginal cell of fore wing parallel-sided, basal length 2.9 × as long as its maximum width (Fig. 10), and 0.9 × as long as subdiscal cell; subdiscal cell roundly closed on level of vein m-cu; vein 1-CU1 very short, nearly quadrate; vein cu-a almost interstitial (Fig. 10); hind wing 5.0 × as long as its maximum width; vein M+CU 0.3 × vein 1-M; vein 1-M 6.3 × vein 1r-m (Fig. 11).

Legs. Fore tarsus 1.2 × as long as fore tibia; inner side of fore tibia with four spines; hind coxa with baso-ventral tooth (Fig. 7), finely and densely granulate; hind femur, tibia and basitarsus 3.3, 7.7, and 6.7 × their maximum width, respectively; dorsal side of hind femur with short sparse semi-erected setae (Fig. 7), length of seta about 0.5 × as long as maximum width of femur; outer side of hind tibia with sparse semi-erected setae, length of seta as long as maximum width of hind tibia; inner hind tibial spur 0.2 × as long as hind basitarsus; hind tarsus 0.9 × as long as hind tibia; basitarsus 0.7 × as long as second-fifth tarsal segments combined (20:33); second tarsal segment 0.5 × as long as basitarsus (10: 20), and 2.0 × as long as fifth tarsal segment (without pretarsus); fourth tarsal segment 0.6 × fifth tarsal segment.

Metasoma. Metasoma 1.4 × as long as head and mesosoma combined; first tergite gradually widened from base to apex; maximum width of first tergite 1.4 × its minimum width (Fig. 8); length of first metasomal tergite 2.4 × apical width, and 1.45 × length of propodeum; second suture indistinct because of straight longitudinal striae; second tergite with lenticular apical area weakly delineated with wide shallow furrows (Fig. 8); second tergite with apical area 2.45 × as long as length of third tergite (Fig. 8); first metasomal tergite with dorsal carinae, granulate basally, longitudinally striate apically (Fig. 8); second-third tergites coarsely longitudinally striate; fourth-fifth tergites largely longitudinally striate basally, finely striate apically; sixth tergite with semi-circular striae in its apical half (Fig. 9).

Colour. Body black; head dark brown; antenna brownish yellow, palpi brown, except apical segment of maxillary palp pale yellow; fore and middle legs brownish yellow, except tarsus yellow, hind coxa dark brown; hind femur and tibia brown; hind tarsus yellow; tegula brown; wing veins yellowish brown; pterostigma brown, cream white basally (Fig. 10).

Male.

Unknown.

Biology.

Unknown.

Etymology.

From directus (Latin for "set straight", "arrange in a straight line"), because of the interstitial vein cu-a of fore wing.