Polemistus gutianus Ma et Li, 2020

Ma, Li & Li, Qiang, 2020, The genus Polemistus de Saussure in China with descriptions of four new species (Hymenoptera: Crabronidae), Zootaxa 4852 (4), pp. 475-484 : 480-482

3. Polemistus gutianus Ma et Li , sp. nov.

( Figure 3 )

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Material examined. Holotype: ♀, China: Zhejiang: Gutian Mountain: Gutian Temple , 29°15'N 118°09'E, 2005. VII.2, NO. 200707724, coll. Qiong Wu ; Paratype: 1♂, China: same as the holotype, 2005.VII.2, NO. 200707758, coll. Qiong Wu ; 1♀, same as the holotype, 2003.VIII.19, NO. 20044123 coll. Qiong Wu. All specimens are deposited in the Parasitic Hymenoptera Collection of Zhejiang University, Hangzhou, Zhejiang Province, P. R. China .

Diagnosis. Unlike the other Chinese Polemistus , this species and P. abnormis lack the median frontal carina and the hypersternaulus. P. gutianus differs from P. abnormis (Kohl, 1888) by the following combination of characters: labrum semicircular ( Fig. 3a ); median and lower frons shallowly concave, lower frons with sparse, transverse striation medially; gena and head underside with large, dense punctures; inner eye orbits moderately convergent toward clypeus ( Fig. 3a ); pronotal collar incomplete, just a corner present on each side; mesoscutum without rugae posteriorly; dorsal surface of petiole with longitudinal groove medially ( Fig. 3e ); gastral segment I half mat, with fine, dense punctures and slightly coriaceous; in female, free margin of clypeus with small tooth on each side ( Fig. 3a ); male flagellomeres I–VI beneath with tyloids ( Fig. 3g ).

P. abnormis (Kohl, 1888) has the following characters: labrum broadly rectangular; median and lower frons deeply concave, lower frons with dense, transverse striation medially; gena and head underside with fine to midsize, dense punctures; inner eye orbits markedly convergent toward clypeus; pronotal collar much narrowed, without anterior ridge; mesoscutum with short, longitudinal rugae posteriorly; dorsal surface of petiole without groove; in female, free margin of clypeus with large prominence on each side; gastral segment I shiny, impunctate; male flagellomeres I–VIII or IX beneath with tyloids.

Description. Female and male. Black. labrum ivory to yellowish; palpi, scape, pedicel beneath, pronotal lobe ivory; pedicel above, forewing veins brown; tegula yellowish to fulvous; gastral sterna V–VI dark brown.

Mandible bidentate apically, outer tooth small, inner tooth much broadened or broad ( Fig. 3a ). Labrum semicircular ( Fig. 3a ). Interantennal tubercle narrow, short. Median and lower frons shallowly concave, frontal median carina lacking ( Fig. 3a ); lower frons with sparse, slender and transverse striation medially, with irregular rugae laterally; median frons with large, dense punctures and several inconspicuous, curving rugae (rugae sometimes lacking). Upper frons with midsize to large, dense punctures. Ocellar triangle moderately convex, with fine to midsize, dense punctures. Vertex behind ocelli with dense, slender, transverse striation. Gena and head underside coarsely coriaceous, with large, dense punctures. Occipital furrow much narrowed, coarsely crenate. Inner orbital furrow narrow, slightly crenate, marginal carina sturdy, inner eye orbits moderately convergent toward clypeus ( Fig. 3a ). Outer orbital furrow much narrowed, with sturdy marginal carina, coarsely crenate.

Pronotal collar incomplete, with just lateral corner. Mesoscutum coarsely coriaceous, with contiguous, midsize punctures, anterior slope nearly vertical and very high ( Fig. 3c ); admedian line impressed, extending to one third of mesoscutum length, coriaceous, with midsize, dense punctures. Metanotum coarsely coriaceous, with fine, dense punctures. Mesopleuron coarsely coriaceous, with large, sparse punctures, episternal sulcus and omaulus conspicuously crenate, scrobal sulcus just forming carina, not crenate, hypersternaulus incomplete or lacking ( Fig. 3c ). Propodeal enclosure not delimited by carina, with sturdy reticulation medially, and sparse, slender, oblique longitudinal rugae laterally ( Fig. 3d ); posterior surface with much narrowed groove medially, shiny, sides of groove large, nearly smooth, with fine, sparse punctures and some inconspicuous striation or finely coriaceous, laterally and posteriorly irregularly reticulate ( Fig. 3d ). Lateral surface of propodeum with dense, sturdy, longitudinal rugae except irregularly rugose ventrally and reticulate posteriorly.

Petiole short, width equal to length, its dorsal surface shiny, smooth, with median longitudinal groove. Gastral segments half mat, with fine, dense punctures and slightly coriaceous. Gaster somewhat constricted between segments I and II.

Female. Body length 5.0– 5.3 mm; mandible brown; flagellomere I and II–IX beneath fulvous to reddish brown; fore and mid legs: coxae apically, trochanters, apical half of femora, tibiae and tarsi ivory; hind leg: coxa apically, trochanter, tibia and tarsus ivory to fulvous, femur largely reddish brown; Setae on clypeus sparse, short and silvery mixed with several long ones apically; inner tooth of mandible much broadened, nearly truncate ( Fig. 3a ); clypeus flat, with midsize, sparse punctures, free margin broadly truncate medially, lateral area with one small tooth on each side; ratio of HW: HLD: HLF = 75: 38: 71; HW: EWd: IOW: EW: OOW: TW: OCW: EL = 75: 19: 3: 25: 2: 19: 1: 63; AOD: WAS: IAD = 3: 7: 8; POD: OOD: OCD = 10: 10: 14. Length of scape: of pedicel: of flagellomere I: width of flagellomere I: length of flagellomere II: width of flagellomere II = 26: 6: 6: 5: 6: 6; pygidial area lacking.

Male. Body length 4.3 mm. Mandible apically reddish brown; flagellomeres III–XI with narrow, dark brown bands basally, apical flagellomere dark brown apically, remainder fulvous to reddish brown; fore and mid legs: basal one fifth or one fourth of femora dark brown, remainder ivory; hind trochanter, outer margin and basal half of tibia, and tarsus ivory, coxa beneath, femur largely, remainder of tibia reddish brown. Setae on clypeus dense, silvery and short. Inner tooth of mandible broad and truncate. Clypeus with midsize, dense punctures, lateral tooth larger than in female ( Fig. 3f ). Ratio of HW: HLD: HLF = 64: 31: 58; HW: EWd: IOW: EW: OOW: TW: OCW: EL = 64: 17: 3: 23: 1: 15: 1: 50; AOD: WAS: IAD = 3: 6: 6; POD: OOD: OCD = 10: 9: 12. Length of scape: of pedicel: of flagellomere I: width of flagellomere I: length of flagellomere II: width of flagellomere II = 23: 4.5: 5: 5: 4.5: 5. Flagellomeres I–VI beneath with long, broad, linear tyloids ( Fig. 3g ). Genitalia ( Figs. 3 h–j).

Distribution. China (Zhejiang).

Etymology. The new species is named after the Gutian Mountain where the type specimens were collected.

Figures

FIGURE 3 Polemistus gutianus Ma et Li, sp. nov. (Holotype, a–e, female; Paratype, f–j, male). a, f. Frontal view of head; b. Dorsal view of head; c. Mesopleuron; d. Dorsal view of propodeum; e. Dorsal view of petiole and gastral tergum I; g. Ventral view of antennal segments I–XIII; h. Lateral view of gonostyle; i. Dorsal view of male genitalia; j. Ventral view of male genitalia; (scale line for b and c: 1 mm; for a, d–f: 1.31 mm; for g–j: 1.63 mm).