Pachyprotasis nigritarsalia, Zhong & Li & Wei, 2021

Zhong, Yihai, Li, Zejian & Wei, Meicai, 2021, Review of the Pachyprotasis flavipes group (Hymenoptera: Tenthredinidae) from China with descriptions of two new species, Zoologia (e 59733) 38, pp. 1-50 : 14

Pachyprotasis nigritarsalia sp. nov.

Figs 83–92

http://zoobank.org/ 8DE4967D-FA1A-47AF-81F5-8A46AF6DEAED

Diagnosis. This species is close to P. rufodorsata sp. nov. in general appearance, but it can be distinguished from the latter by the following characters: median and mesoscutal lobe black, lateral part and a central spot on lateral mesoscutal lobe reddish-brown; mesepisternum without white horizontal band; metatarsus black, without red macula; flagellomere 1 shorter than flagellomere 2; punctures on mesepisternum large, distinct.

Description. Holotype female ( Figs 83–86). Body length 9.0 mm. Body black, with white pattern as follows: lateral part of clypeus, supraclypeal area, lower 1/4 of inner orbit continuous with lower 1/8 of hind orbit, venter of scape, tegula, central band on mesoscutellum, outer margin of mesepimeron, apical half of metepisternum, upper corner and apical half of metepimeron, narrow triangular spots on all posterior parts of terga, all of laterotergites, all posterior parts of sternites, lower part of basal sheath; reddish-brown are: posterior margin of pronotum, lateral margin of lateral mesoscutal lobe continuous with parapsis, spot on lateral mesoscutal lobe, lateral part of mesoscutellum and mesopostnotum, lateral part of metanotum, mesepisternum, central spot on mesepimeron; labrum and clypeus yellowish-brown. Legs yellowish-brown, with yellowish-white pattern as follows: fore and middle coxae, trochanters and base of femora, metatrochanter, metafemora except inner and outer bands on apex; apical 2/9 of metatibiae and whole metatarsus black. Wings hyaline, veins C, R1, 2r and stigma pale brown, other veins black.

Labrum large and with squarely pointed anterior margin; clypeus roundly incised to 1/3 of its middle length, lateral lobes a little blunt; malar space as long as diameter of median ocellus; inner margins of eyes slightly convergent downwards ( Fig. 87); supra-antennal tubercles inconspicuous, frontal area indistinctly elevated, as high as level of eyes in lateral view, frontal ridges blunt; median fovea ditch-like, shallowly reaching median ocellus, supra-antennal pit shallow; interocellar furrow wide and a little deep, postocellar furrow shallow; postocellar area elevated, broader than long by 13:8, lateral furrows deep and slightly divergent backwards; head distinctly narrowed behind eyes ( Fig. 88). Antenna longer than thorax and abdomen together, flagellomere 1 slightly shorter than flagellomere 2 by 38:41. Mesoscutellum prismatically elevated, lateral carina acute, mesoscutellar appendage with acute middle carina on basal half and blunt one on apical half. Metatarsomere 1 longer than following 4 tarsomeres together, claw with inner tooth longer than outer tooth. Front wing with middle petiole of anal cell shorter than length of basal anal cell, but longer than 2 times vein R+M; petiole of anal cell on hind wing distinctly longer than half of vein cu-a.

Punctures on labrum and clypeus sparse, minute and shallow; punctures on dorsal part of head minute and shallow, slightly dense, surface between punctures with microsculpture and oily lustre; punctures on mesonotum and lower part of mesepisternum minute and dense, shining; punctures on upper part of mesepisternum moderate, surface between punctures with distinct oily lustre and microsculpture; outer part of mesepimeron with distinct sculptures, sub-shining, inner part polished, punctures absent, microsculpture indistinct; punctures on metapleuron minute, shallow and indistinct, surface between punctures with oily lustre; center of mesoscutellum polished without punctures, lateral part with a few large and shallow punctures, strongly shining; mesoscutellar appendage with distinct microsculpture, shining; punctures on terga sparse, minute and shallow, surface between punctures with microsculptures and oily luster; punctures on outer side of hind coxa minute, shallow and indistinct.

Ovipositor sheath longer than middle tarsomere 1 and round in lateral view, apical sheath distinctly longer than basal sheath ( Fig. 89). Lancet with 22 annuli, base of each serrula flat, middle serrulae with 2 anterior and 15–16 posterior subbasal teeth ( Figs 90–92).

Male. Unknown.

Variation. Body length of female 8.0–9.0 mm.

Distribution. China (Hunan).

Type material. Holotype, ♀, China, Hunan province, Yongzhou, Mt. Shunhuang , 26°24’N, 111°03’E, alt. 900–1200 m, 28-IV-2004, Wei XIAO leg. ( ASMN) . Paratypes, 29♀, China, Hunan province, Yongzhou, Mt. Shunhuang , 26°24’N, 111°03’E, alt. 900–1200 m, 28-IV-2004, Wei XIAO et. leg.; 5♀, China, Hunan province, Suining, Mt. Huangsang , 26°24’N, 111°03’E, alt. 900–1200 m, 28-IV-2004, Meicai WEI & Wei XIAO leg.; 3♀, China, Hunan province, Wugang, Mt. Yun, Yunfengge , 26°38’N, 110°37’E, alt. 1170 m, 13–14-IV-2010, Xiaohua WANG & Yanxia LIU leg. ( ASMN) .

Etymology. The specific epithet, “ nigritarsalia ”, refers to the black metatarsus.