Hylaeus (Hylaeus) maoxianus, Dathe, 2015

Dathe, Holger H., 2015, Studies on the systematics and taxonomy of the genus Hylaeus F. (10) New descriptions and records of Asian Hylaeus species (Hymenoptera: Anthophila, Colletidae), Beiträge Zur Entomologie = Contributions to Entomology 65 (2), pp. 223-238 : 228-230

Hylaeus (Hylaeus) maoxianus spec. nov.

Figures 9–12 , 29

Diagnosis: This species is characterised by the rounded propodeum with weak sculpture. A special feature of the males is the shape of the penis valves, that in dorsal view are strikingly constricted in the middle. Also in the other terminalia, the ground plan morphology of the subgenus Hylaeus is modified in a specific manner. The females can be easily recognised by the fungiform spot on the anterior margin of the clypeus. Both sexes are remarkably pilose.

mesonotum, propodeum and basal terga in dorsal view. – 9, 10 Holotypus male. 11, 12 Paratypus

female. – Scale 0.5 mm.

Description: Male. TL 3.5–5.1 (4.34) mm, WL 3.2–3.9 (3.51) mm.

Head. Proportions HL:HW 0.91, UHW:LHW 1.77, profile short trapezoid. Scapi black, elongate, slender, not wider than flagella, SL:SW 2.68; flagella long, black, yellow below. Mask complete, light yellow, side patches expanded to upper margin of scapi bases, declining to orbits. Foveae faciales short, indistinct, formed as short ridges at upper margin of complex eye. Supraclypeal area little vaulted, its lateral profile follows the curvature of the face with gentle transition to the frons; upper half of the supraclypeal area with shallow median sulcus. Clypeus CL:CW 1.29, finely shagreen with only few scattered punctures, shiny, anterior margin light brown. Frons and vertex with subcontiguous, strong punctation, on the frons arranged in curved rows; vertex with moderately dense erect pilosity. Genae normal, with elongated punctuation; occiput edged in the middle, laterally rounded; malae narrow. Labrum and mandibles black, the latter bifid.

Mesosoma normally formed, overall rounded; pilosity conspicuous, thorax and propodeum entirely with protruding long white hairs, dorsally somewhat shorter. Coloration black, only pronotum laterally with two short yellow stripes, tegulae and calli with yellow spot. Pronotum very narrow, anterior margin sharp in the middle, dorsolateral angles little expanded, blunt-edged. Mesonotum and scutellum finely shagreen, silkily shiny, punctation moderate, close; scutellum with somewhat larger and more scattered punctation, more shiny; metanotum matt, finely punctate; mesopleurae shiny, with somewhat coarser and more scattered punctation than mesonotum, anterior margin rounded. Legs black, anterior surface of foretibiae, base of other tibiae and basitarsi yellow; wings hyaline, venation dark brown. Propodeum totally rounded, its surface weakly sculptured, slightly shiny; basal area bounded laterally by fine carinae only, other areas not otherwise delimited; propodeal furrow deep, parallel-sided.

Metasoma narrow spindle-shaped, coloration black. T1 smooth and shiny, punctation sparse, moderate; surface with short erect hairs; T2 and following terga with fine shagreen and shallow, close punctation; T1 and T2 with indistinct white lateral fringe, interrupted white ciliary bands on depression of the following terga. Terminalia ( Fig. 29 ): genital capsule short, compact, characterised by laterally deeply constricted penis valves (in dorsal view); the shaft of apical lobus of S8 appears preapically constricted and ends in rounded two-part lobe without bristles; S7 wide at the central part, proximal lobes short, with more pronounced distal lobes (“flags”).

Female. TL 4.7–5.2 (4.82) mm, WL 3.9–4.2 (4.02) mm.

Head. Proportions HL:HW 0.93, UHW:LHW 1.58, outline transverse elliptic. Scapi black, flagella short, black, undersides yellow. Face with yellow side spots filling paraocular area below foveae. Foveae faciales long, reaching upper eye border. Clypeus CL:CW 1.23, longitudinally finely striated, matt, without punctation; supraclypeal area with the same structure, indistinctly separated from clypeus, with a gradual transition to the frons. Frons and vertex with subcontiguous, strong punctation. Genae normal, in outline sloping below. Labrum and bifid mandibles black.

Mesosoma normally formed, rounded; pilosity conspicuous, entire thorax and propodeum with protruding long white hairs, dorsally somewhat shorter. Coloration black, pronotum laterally with two yellow stripes, tegulae and calli each with a yellow spot. Pronotum barely expanded anteriorly, anterior margin narrow in the middle, dorsolateral angles little expanded with blunt edges. Mesonotum and scutellum finely shagreen, silkily shiny, punctation moderate, close; scutellum with somewhat larger scattered punctation, glossy; metanotum matt, finely punctate; mesopleurae shiny, with somewhat coarser and more scattered punctation than mesonotum, anterior margin rounded. Legs black, only base of tibiae and basitarsi yellow; wings hyaline, venation dark brown. Propodeum totally rounded, its surface weakly sculptured, slightly shiny; basal area not bounded laterally, with short wrinkled longitudinal ridges at its base; other propodeal areas not marked or otherwise delimited; propodeal furrow deep.

Metasoma stocky spindle-shaped, black. T1 smooth and shiny, punctation sparse, strong; following terga finely shagreen, with moderate shallow punctation, depressions not separate; T1 with sparse white ciliary flecks; fringe of last sternum bright.

Types: 10 ♂, 4 ♀.

Holotypus: ♂ CHINA. Sichuan Province : Ngawa pref., nr Maoxian, stream, 31°45.111N 104°00.021E, 4265 ft, 25.05.2011 leg. J.S. Ascher, L. Ding, Z. Niu & J.G. Rozen. – In coll. IZCAS Beijing .

Paratypes: 9♂, 4♀ CHINA, same collecting data. – In coll. IZCAS Beijing, AMNH New York, SDEI Müncheberg .

Derivatio nominis: The name refers to the type locality of the new species; it is an adjective.

Figures

Figs 9–12: Hylaeus (Hylaeus) maoxianus spec. nov.: head in frontal view; surface structure of

Figs 27–30: Male terminalia: metasomal sterna 7 and 8 (S7 left ventral view, right dorsal view), genital capsule. – 27H. (Hylaeus) oliviae spec. nov. – 28 H. (Hylaeus) ascheri spec. nov.– 29 H. (Hylaeus) maoxianus spec. nov. – 30 H. (Hylaeus) rozenius spec. nov. – Scale 0.2 mm.