Bombus (Pyrobombus) wolongensis Williams, Ren & Xie, 2022

Williams, Paul H., Dorji, Phurpa, Ren, Zongxin, Xie, Zhenghua & Orr, Michael, 2022, Bumblebees of the hypnorum-complex world-wide including two new near-cryptic species (Hymenoptera: Apidae), European Journal of Taxonomy 847, pp. 46-72 : 58-60

publication ID 10.5852/ejt.2022.847.1981

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Bombus (Pyrobombus) wolongensis Williams, Ren & Xie

sp. nov.

Bombus (Pyrobombus) wolongensis Williams, Ren & Xie sp. nov.

Figs 1–2 View Fig View Fig , 5‒9 View Figs 3–38 , 51 View Fig

[ Bombus (Pyrobombus) hypnorum ( Linnaeus, 1758) View in CoL – Williams et al. 2009b: 157, (in part) misidentification.]


Female distinguished by the combination: labral lamella narrow and deeply rounded, almost pointed in the middle; clypeus in the central area with scattered widely-spaced small punctures and the very large punctures spaced by more than three times their own diameter; ocello-ocular area along the inner eye margin with only one row of larger medium punctures; thoracic dorsum with the hair predominantly dull yellow with a dense central spot between the wing bases of black hair.

Male distinguished by the combination: hair of the thorax and metasomal T1‒2 yellow, T3‒4 black.


Named for its occurrence near the area named Wolong, in Sichuan Province.

Material examined

Holotype CHINA • ♀ (queen) pinned; [four labels]; [(1) white hand-written in red] ‘6605’; [(2) white printed in black] ‘ CHINA: Sichuan / Leibo Co, Gudui 1711m / 28.47056N 103.31884E / J Wang’; [(3) green printed in black] ‘BOLD# / ( BEE-BOL / BBW / PHW) / 596G12-6605-CHN’; [(4) red printed in black] ‘HOLOTYPE ♀ (q) / Bombus wolongensis / Williams, Ren & Xie / det PH Williams 2022’; IOZ. GoogleMaps

Material sequenced or examined CHINA • 1 ♀ (queen); Sichuan, Leibo Co., Gudui ; 28.4706° N, 103.3188° E; alt. 1711 m; 8 Apr. 2007; Z. Xie leg.; [#6603]; BOLD-596H01-0012-CHN ; PW GoogleMaps 1 ♀ (queen); Sichuan, Leibo Co., Gudui ; 28.4706° N, 103.3188° E; alt. 1711 m; PW GoogleMaps 1 ♂; Sichuan, Litang Co., Litang-Yajiang ; 30.0079° N, 100.3137° E; alt. 4382 m; 10 Jul. 2003; Y. Tang leg.; BOLD-1550A08-CHN ; PW GoogleMaps 1 ♂; Sichuan; Y. Tang leg.; [TY0700189]; PW 1 ♂; Yunnan, Lijiang ; 29.0025° N, 100.1825° E; alt. 3200 m; 27 Jul. 2018; Z. Ren leg.; PW GoogleMaps .



Habitus illustrated in Fig. 51 View Fig , body size small (queen body length 15‒17 mm, worker: no workers available to hand), hair (pubescence) moderately long, wings lightly clouded with brown. Mandible with the distal notch anterior to the posterior tooth (incisura) very shallow. Oculo-malar area (‘cheek’ sensu Williams et al. 2014; not the gena) of medium length, 1.0 × as long as the breadth of the mandible at its base (length measured between the ventral edge of the compound eye and the edge of the malar area at the articulation of the mandible midway between the mandibular condyles; breadth measured between and including the mandibular condyles). Labral lamella narrowly rounded and almost pointed in the middle. Clypeus weakly swollen, its raised area nearly flat, the central area with few widely scattered large, medium, and small punctures with intervening areas shining, few punctures especially medially and ventrally adjacent to the labrum. The area between the inner edge of the compound eye and the outer edge of the lateral ocellus occupied in just more than its outer third by widely spaced medium and small punctures, spaced by more than their own widths, the medium punctures in a single row. Mid basitarsus with the distal posterior corner broadly rounded; hind tibia outer surface with a corbicula, the surface sculpturing weakly reticulate so that the surface appears slightly matt; hind basitarsus in the distal three quarters covered with short branched decumbent and weakly overlapping hairs with golden reflections; metasomal T6 posteriorly rounded and not divided medially, with a small subapical dorsal boss. Colour pattern of the hair of the body predominantly black. Head entirely black, except for orange hairs anteriorly on the labrum and laterally on the mandibles, and a yellow fringe posteriorly on the occiput. Thoracic dorsum dull yellow (the exact shade varies but is lighter than for unfaded B. bryorum ), this pale hair not extending down the side of the thorax anteriorly, with black hair as a small or large dense central spot between the wing bases and often a few black hairs scattered laterally and especially anteriorly; the front, middle and hind leg tibiae all with the hairs predominantly black, the basitarsi all with the integument brown-black like the tibiae. Hair of T1 yellow, T2‒3 and T4 anteriorly black, T4 posteriorly and T5‒6 cream-white.


Body size small (body length 11‒13 mm), hair (pubescence) moderately long, wings very lightly clouded with brown. Colour pattern of the hair of the body predominantly yellow. Front and top of the head with some black hair intermixed. Hair of metasomal T3‒5 with some black hair at least anteriorly, T5‒7 predominantly cream-white. Male genitalia with the gonostylus nearly triangular, the inner anterior (basal) projection separated from the gonocoxa by a distance equal to the breadth of the recurved hook of the penis-valve head; the volsella scarcely projecting beyond the gonostylus; the penis valve with the head recurved as a flattened sickle-shaped hook that is not tapering at the mid-point of its length.


In the mountains of Sichuan and Yunnan, at elevations 1711‒4382 m (Williams et al. 2009). Uniquely for species pairs within the hypnorum -complex, this species shows an overlap in distribution range with B. hengduanensis in Sichuan and Yunnan.


Paleontological Collections














Bombus (Pyrobombus) wolongensis Williams, Ren & Xie

Williams, Paul H., Dorji, Phurpa, Ren, Zongxin, Xie, Zhenghua & Orr, Michael 2022

Bombus (Pyrobombus) hypnorum ( Linnaeus, 1758 )

Williams P. H. & Tang Y. & Yao J. & Cameron S. 2009: 157
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