Stigmus carinannulatus Li & Ma sp. nov.

Figs 1 A – N, 7 A, B

Type material.

Holotype: China • ♀; Yunnan, Tengchong City; 25 ° 1 ′ N, 92 ° 28 ′ E; 11. VIII. 2011; coll. Jujian Chen; sweep net (YNAU). Paratypes: China • 20 ♂♂; Yunnan, Kunming City, Yunnan Agricultural University; 25 ° 7 ′ N, 102 ° 44 ′ E; 12. IV. 2023 (5 ♂♂), 12. VI. 2023 (9 ♂♂), 19. VIII. 2023 (6 ♂♂); 1910 m elev.; coll. Jinghong Li; sweep net (YNAU); China • 1 ♂; Yunnan, Baoshan City, Longyang District, Lujiang Country, Pumanshao Village; 24 ° 56 ′ N, 98 ° 47 ′ E; 21. VII. 2006; 1951 m elev.; coll. Zhongshi Zhou; sweep net (YNAU).

Diagnosis.

The new species can be easily separated from the similar species S. denticorneus Bashir & Ma, 2019 by the following characters: hindwing media diverging before cu-a; occipital carina complete, ending to midventral line; anterior area of pronotal collar with complete, transverse carina; scutum with several, large punctures, anterior area with distinct, longitudinal striations, posterior area with dense, fine, short, longitudinal rugae; posterior area of mesopleuron with sparse, short, longitudinal rugae, episcrobal area smooth, without striation. Stigmus denticorneus has the following characters: hindwing media diverging beyond cu-a; occipital carina incomplete, not ending to midventral line, suddenly ended at posterior ridge of stomal hollow; anterior area of pronotal collar with incomplete, transverse carina, narrowly emarginated in middle; anterior area of scutum with dense, large punctures, remainder with sparse, midsize to large punctures; posterior area of mesopleuron smooth, without rugae, episcrobal area with dense, longitudinal striations.

Description.

Female. Measurements. ♀, BL: 4.6 mm; HW: HLD: HLF = 78: 54: 59; HW: EWd: EW: TW: EL = 78: 23: 22: 28: 51; POD: OOD: OCD = 8: 14: 15; length of scape: length of pedicel: length of flagellomere I: width of flagellomere I: length of flagellomere II: width of flagellomere II = 21: 9: 8: 5: 8: 5; PL: PW: LTI: WTI: HFL: HTL = 36: 11: 40: 46: 48: 55. ♂, BL: 3.5–4.6 mm; HW: HLD: HLF = 53: 31: 42; HW: EWd: EW: TW: EL = 53: 15: 20: 12: 36; POD: OOD: OCD = 5.5: 10: 11; length of scape: length of pedicel: length of flagellomere I: width of flagellomere I: length of flagellomere II: width of flagellomere II = 13: 5: 5: 3: 5: 3; PL: PW: LTI: WTI: HFL: HTL = 24: 5: 25: 26: 33: 57.

Color pattern. Body black; clypeus with reddish brown to dark brown band subapically; mandible fulvous except reddish brown apically; labrum dark brown; palpi, scape, pedicel, tegula and pronotal lobe fulvous; flagellomeres I – V beneath fulvous, above brown, remainder dark brown; forewing veins brown; fore and mid legs: fulvous except coxa largely and femur medially dark brown; hind leg: trochanter, basal 1 / 4 of tibia and tarsus fulvous, remainder dark brown; gastral sterna IV-VI fulvous to dark brown; setae on clypeus and mandible sparse and golden.

Head. Mandible tridentate apically, median tooth large (Fig. 1 A). Labrum with two distinct cornuted teeth apically. Clypeus shiny, nearly flat, with sparse, midsize punctures; free margin of clypeus slightly produced and with two distinct triangular teeth medially, slightly reflected, area between two teeth deeply emarginated (Fig. 1 A). Scapal hollow moderately matt, coriaceous, somewhat shallow and defined, provided with one vestigial minute tubercle medially, not spined (Fig. 1 A). Frontal furrow very fine and weakly impressed, inconspicuously (Fig. 1 A). Median and upper frons shiny, with sparse, fine punctures, gently convex (Fig. 1 A). Ocellar triangle area flat, shiny, impunctate, area near eyes with dense, short, impressed lines, opaque area smaller than hind ocellus (Fig. 1 B). Vertex shiny, impunctate (Fig. 1 B). Gena shiny, smooth and impunctate (Fig. 1 C). Head from above with temples rarely convergent posteriorly, subquadrate (Fig. 1 B). Occipital carina complete, ending to midventral line, dorsal area much narrowed, not crenulate, ventral area gently broadened, coarsely crenate (Fig. 1 C); inner and outer orbital furrows lacking (Fig. 1 A).

Mesosoma. Pronotal collar with strong, transverse carina anteriorly, and with incomplete lateral rugae, only distinct in posterior area, without antero-lateral corner (Fig. 1 D). Scutum moderately matt, with several large punctures, anterior area with dense, conspicuous, longitudinal striations, posterior area with dense, fine, short, longitudinal rugae (Fig. 1 D); admedian line weakly impressed, extending to 1 / 2 of scutum length; notaulus deeply grooved and crenulate, reaching 2 / 5 of scutum length; parapsidal line distinct (Fig. 1 D). Scutellum shiny, with sparse, fine punctures, without medial longitudinal line (Fig. 1 D). Metanotum weakly coriaceous (Fig. 1 D). Mesopleuron shiny, posterior area with several slender, short, longitudinal rugae, episcrobal area shiny and smooth (Fig. 1 E); omaulus and hypersternaulus broadened, distinctly crenate, scrobal suture complete and inconspicuous, just with single longitudinal rugae (Fig. 1 E). Propodeal enclosure triangular medially, with three sturdy longitudinal median rugae, and several transvers rugae, with sparse sturdy, oblique, longitudinal rugae laterally (Fig. 1 F); posterior surface of propodeum with sparse irregular rugae, without conspicuous median groove (Fig. 1 F); lateral surface of propodeum with dense, oblique, longitudinal rugae anteriorly and medially, and irregular reticulation posteriorly (Fig. 1 E).

Legs. Outer surface of hind tibia with three long, slender, fulvous to dark brown spines.

Wings. Forewing venation typical for genus Stigmus, hindwing media diverging before cu-a.

Metasoma. Dorsal surface of petiole subquadrate, moderately convex and widened toward apex slightly, and with two sturdy, longitudinal, median carinae, area between carinae with dense, fine, irregular rugae, median and posterior areas with two sturdy, longitudinal, lateral rugae on each side (Fig. 1 G). Lateral surface of petiole with three strong, longitudinal rugae medially and posteriorly (Fig. 7 A). Ventral surface of petiole with a few strong, short, longitudinal rugae posteriorly. Gastral terga shiny, impunctate, gastral sternum VI with sparse, fine punctures apically (Fig. 1 H). Pygidial area moderately matt, broadly triangular, apex truncate, with longitudinal micro-striations (Fig. 1 H).

Male. Same as female except tegula dark brown; setae on clypeus dense, silvery, short (Fig. 1 I); mandible bidentate apically (Fig. 1 I); free margin of clypeus slightly produced, nearly truncate medially, and with shallow emargination (Fig. 1 I); head from above with temples somewhat roundly convergent posteriorly; dorsal area of occipital carina much narrowed, coarsely crenulate, and ventral area somewhat broadened, distinctly crenate (Fig. 1 J); flagellomeres without tyloids, setae normal; gastral sterna impunctate (Fig. 1 J).

Distribution.

China (Yunnan).

Etymology.

The name, carinannulatus, is derived from the Latin carin - (= carina) and the Latin word annulatus (= annular), referring to the complete occipital carina.