Tyloceridius stictocephalus, Wei, Meicai, Niu, Gengyun & Taeger, Andreas, 2014

Wei, Meicai, Niu, Gengyun & Taeger, Andreas, 2014, A second species of Tyloceridius Malaise (Hymenoptera, Tenthredinidae), ZooKeys 396, pp. 55-65 : 58-60

Tyloceridius stictocephalus sp. n. Figs 1-10

Description.

Holotype ♀ (Fig. 1).

Body length 11 mm. Greenish yellow, following parts black: apex of each mandible; antennae entirely; supra-antennal tubercle, frons and adjacent area of upper inner orbit except a stripe on frontal ridge, postocellar area, a broad band from upper hind corner of each eye to postocellar area (Figs 1, 4); a medial band on pronotum; meso- and metanotum, except mesoscutellum and 2 small triangular spots on mesoscutal lateral lobe and 2 linear spots on mesoscutal median lobe; abdomen above, except for tergites 8-10 and a broad band on posterior margin of tergites 3-4 (in the middle covering about two thirds, laterally about one third of the length of the tergite); depressed upper corner of mesepimeron and a minute and roundish dot in lower posterior corner of mesepisternum. Legs greenish yellow, following parts black: a small dot on extreme apex of each femur; a narrow dorsal stripe on each tibia and tarsus. Wings hyaline with very faint yellow tinge, vein C and stigma yellow brown, other veins pale brown. Body hairs silver.

Body shiny; labrum without large punctures; central area of clypeus, outer sides of mandibles with some large punctures, head above antenna including supra-antennal tubercle with large and deep punctures, interspaces between punctures about as large as a puncture, surface smooth and shiny; punctures on postorbit sparser but distinct; punctures on mesoscutal median lobe and mesoscutal lateral lobe smaller than punctures on head, interspaces shiny; posterior margin of mesoscutellum densely punctured, dorsal side of mesoscutellum hardly punctured; mesoscutellar appendage impunctate, parapsis of mesothorax microsculptured; metascutellum with some minute punctures; mesepisternum densely punctured, narrow interspaces smooth, strongly shiny; metepisternum densely punctured, mesepimeron and metepimeron polished, with scattered punctures. Abdominal tergites 1-2 strongly shiny, tergite 3 weakly microsculptured in basal half, tergites 4-7 distinctly microsculptured and punctured in basal half.

Clypeus and labrum as Fig. 5; left mandible as Fig. 2, right mandible as Fig. 3; ED = 1.7; supra-antennal tubercle larger than scape (Fig. 4), clearly above top of ocelli in lateral view; a distinct tubercle present on anterior margin of middle fovea and almost in line with anterior margins of supra-antennal tubercles; frontal walls broad and flat, parallel to each other; postocellar area 1.2 × as broad as long; lateral furrows deep, distinctly divergent backwards; POL: OOL: OCL = 1: 2.5: 2.5; head behind eyes about as long as eyes in dorsal view, lateral edge roundly curved (Fig. 4); occipital carina distinct in entire length. Antennae stout, weakly compressed, 0.9 × length of head and thorax combined, antennomere 3 0.9 × length of antennomeres 4 and 5 combined, antennomeres 6-8 1.7 × as long as broad (Fig. 6). Anal cell of hind wing sessile. Ovipositor sheath 1.1 × length of fore tibia. Lancet with 21 serrulae, serrulae 5-6 as Fig. 7.

Variability (females). Body length 10-11 mm. Punctation on upper head varies from sparse to dense; supra-antennal tubercle sometimes only with few punctures and / or smaller than scape; tergites 1-2 smooth to rather densely punctured laterally and on basal half; POL: OOL: OCL = 1: 2.0-2.7: 2.0-2.6; postocellar area 1.2-1.4 × as broad as long; head behind eyes 0.8-1.0 × as long as eyes in dorsal view. Ratio of length and breadth of antennomeres 6-8: 1.5-1.9. Black spot on lower mesepisternum may be indistinct or missing; pale color on tergite 4 may be reduced to a triangular spot; greenish color may alter (in dried specimens) to yellow.

Male. (Figs 8-10) Body length 8-9 mm. Color and structure similar to female. Generally darker than the female: pale stripe on upper inner orbit very narrow and only exceptionally nearly extending toward postocellar area; frontal ridges black or pale marked; hind tibia and tarsus entirely black; pale macula on mesoscutellum more or less reduced; mes oscutal median lobe usually entirely black, without pale lateral stripe; tegula black, basally pale; lower mesepisternum usually with broad black stripe, sometimes anteriorly reduced to a large spot; tergites 3-4 dorsally usually only with faintly indicated pale hind margin, sometimes completely black; subgenital plate apical margin rounded. Penis valve Fig. 10.

Pictures of several paratypes are given in original resolution at http://dx.doi.org/10.6084/m9.figshare.781286

Etymology.

The specific epithet, an adjective, refers to the distinctly punctured head.

Distribution.

China (Tibet), Nepal (Karnali).

Holotype.

♀, China: Tibet, Yadong, Naiduilashan, 27°24'51"N, 88°56'08"E, 3100m, 2003.VIII.29, Wei Meicai leg. Coll. CSCS.

Paratypes.

(7 ♀♀, 10 ♂♂, DEI-GISHym 17227-17243, in coll. CSCS, DEI, NHRS, NKME). Nepal, Prov. Karnali: 1 ♀, Umg. Churta 3000-3400 m, 31.V.2007 (DEI-GISHym 17228, BOLD:ACG2198); 1 ♀, Umg. Churta E Hochtal 3500-4000 m, 02.VI.-04.VI.2007; 4 ♂♂, Umg. Churta E Hochtal 3500-3800 m, 02.VI.2007; 1 ♀, Gothichaur, 29°12'10"N, 82°18'56"E, 2850 m, 09.VI.1997; 1 ♀, Gothichaur, Thymian-Wiese, 3100 m, 26.V.2007; 1 ♀ 2 ♂♂, Gothichaur, 29°11'54"N, 82°18'36"E, 2850 m, Sumpfwiese, 26.V.-05.VI.2007; 4 ♂♂, Gothichaur, 29°11'54"N, 82°18'36"E, 2850 m, Umg. Lager, 26.V.-05.VI.2007; all specimens F. Creutzburg leg.; 1 ♀, Gothichaur 2 km W, 2700 m; 20.-21.V.1995, M. Hartmann leg.; 1 ♀, Gothichaur, Wald, 29°12'10"N, 82°18'56"E, 2850 m, 08.VI.1997, M. Hartmann leg.