Stigmus flagellipilaris Li & Ma, 2024

Li, Jinghong, Li, Qiang & Ma, Li, 2024, Five new species of the genus Stigmus Panzer (Hymenoptera, Crabronidae) from China, with a key to all Chinese species, ZooKeys 1204, pp. 313-336 : 313-336

Stigmus flagellipilaris Li & Ma sp. nov.

Figs 3 A – K , 8 A

Type material.

Holotype: China • ♂; Yunnan, Tengchong city, Shabadi Village ; 25 ° 23 ' N, 98 ° 42 ' E; 2–18. IV. 2020; 1739 m elev.; coll. Lang Yi; Malaise trap ( YNAU) . Paratypes: 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) ; China • 1 ♂; Yunnan, Wenshan City, Maguan County, Wazishan Village ; 22 ° 51 ′ N, 104 ° 23 ′ E; 13. VIII. 2017; 1722 m elev.; coll. Li Ma; sweep net ( YNAU) .

Diagnosis.

Differs from S. japonicus by hindwing media diverging before cu-a; scrobal suture inconspicuous, just single weak rugae; opaque area smaller than hind ocellus; median and upper frons with several large punctures; vertex shiny, and with sparse, fine punctures. Stigmus japonicus has the following characters: hindwing media diverging beyond cu-a; scrobal suture broadened, distinctly crenate; opaque area larger than hind ocellus; medial and upper frons with sparse, fine punctures; vertex moderately matt, with sparse, midsize punctures.

Description.

Male. Measurements. ♂, BL: 3.2–4.3 mm; HW: HLD: HLF = 69: 44: 54; HW: EWd: EW: TW: EL = 69: 20: 19: 23: 43; POD: OOD: OCD = 8: 12: 12; length of scape: length of pedicel: length of flagellomere I: width of flagellomere I: length of flagellomere II: width of flagellomere II = 16: 6: 7: 4: 7: 4; PL: PW: LTI: WTI: HFL: HTL = 33: 7: 34: 32: 39: 50.

Color pattern. Body black; mandible yellowish except reddish brown apically; labrum, scape, pedicel and pronotal lobe fulvous; palpi yellowish; flagellomeres reddish brown except I – IV beneath fulvous; tegula brown; forewing veins fulvous to brown; fore and mid legs: trochanter, base and apex of femur, tibia largely, tarsi yellowish, remainder dark brown; hind leg: coxa apically, trochanter, base and apex of femur, tibia largely, tarsi yellowish, remainder dark brown; setae on clypeus and lateral upper frons silvery; mandible with sparse golden setae.

Head. Mandible bidentate apically (Fig. 3 A ). Labrum subquadrate (Fig. 3 A ). Clypeus nearly flat, with dense, tiny punctures; free margin of clypeus slightly produced and nearly truncate medially, with shallow emargination (Fig. 3 A ). Scapal hollow matt, distinctly coriaceous, somewhat shallow, provided with one vestigial minute tubercle medially; frontal furrow weakly impressed; medial and upper frons shiny, with several large punctures, slightly convex (Fig. 3 A ). Ocellar triangle area flat, shiny, impunctate, area near eyes with dense, short, impressed lines, opaque area smaller than hind ocellus (Fig. 3 C ). Vertex shiny, with sparse, fine punctures (Fig. 3 C ). Gena shiny, with sparse, midsize to large punctures dorsally; ventral gena shiny, smooth, impunctate (Fig. 3 B ). Head from above with temples gradually convergent posteriorly (Fig. 3 C ). Occipital carina incomplete, not ending to midventral line, suddenly ended at posterior ridge of stomal hollow, dorsal area much narrowed, not crenulate, ventral area gently broadened, distinctly crenate (Fig. 3 B ). Inner and outer orbital furrows lacking (Fig. 3 A, B ). Flagellomeres without tyloids, with longish and dense setae (Fig. 3 A ).

Mesosoma. Pronotal collar with strong, transverse carina anteriorly, and with incomplete lateral rugae, only distinct in posterior area, without antero-lateral corner (Fig. 3 D ). Scutum moderately matt, with several inconspicuous, large punctures; admedian line distinctly impressed, extending to 2 / 5 scutum length; notaulus deeply grooved and crenulate, reaching 1 / 3 of scutum length; parapsidal line distinctly impressed (Fig. 3 D ). Scutellum matt, with sparse, midsize punctures, and median, longitudinal line weakly impressed (Fig. 3 D ). Metanotum distinctly coriaceous (Fig. 3 D ). Mesopleuron moderately matt, with fine sculptures and several large punctures, posterior area smooth, without rugae, episcrobal area with dense, slender, longitudinal striations; omaulus and hypersternaulus broadened, distinctly crenate, scrobal suture inconspicuous, just with several single rugae (Fig. 3 E ). Propodeal enclosure triangular medially, with three sturdy, longitudinal rugae and sparse, strong, transvers rugae, lateral area with irregular rugae mixed with a few, sturdy, oblique, longitudinal rugae; posterior surface of propodeum without distinct median groove, with sparse, strong, transverse rugae, remainder with sturdy reticulation (Fig. 3 F ); lateral surface of propodeum with contiguous, slender or sturdy, oblique, longitudinal rugae anteriorly and medially, and irregular reticulation posteriorly (Fig. 3 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 oblique, longitudinal carinae forming V-shaped medially, area between carina gently convex, and with a few sturdy, oblique, longitudinal rugae on each side (Fig. 3 G ); lateral surface of petiole with several strong, longitudinal rugae (Fig. 8 A ); ventral surface of petiole with a few sturdy, short, longitudinal rugae posteriorly.

Female. Unknown.

Distribution.

China (Yunnan).

Etymology.

The specific name, flagelli, is derived from the Latin flagell - (= flagellum) and the Latin word pilaris (= crinal), referring to the flagella without tyloids, and with long setae and dense pilosity.

Figures

Figure 3. Stigmus flagellipilaris Li & Ma, sp. nov. (male) A head, frontal view B head, ventral view C head, dorsal view D collar, scutum, scutellum and metanotum, dorsal view E thorax, lateral view F propodeum, dorsal view G petiole, dorsal view H gastral tergum VIII, ventral view I male genitalia, dorsal view J male genitalia, ventral view K male genitalia, lateral view. Scale bars: 1 mm (A – G); 0.1 mm (H – K).

Figure 8. A Stigmus flagellipilaris Li & Ma, sp. nov. (male) B Stigmus sulciconspicus Li & Ma, sp. nov. (female) C, D Stigmus solskyi Morawitz, 1864. (C female D male) A – D lateral view. Scale bars: 1 mm.