(Sibiricobombus) Vogt 1911

Subgenus Sibiricobombus Vogt, 1911 Sibiricobombus Vogt, 1911: 60. Obertobombus Reinig, 1930: 110. We associate a total of 82 published formal names with species of the subgenus Sibiricobombus (including misspellings and infrasubspecific names). Below is a list of the 11 species recognised from the integrative analysis together with the synonyms that occur most frequently in the literature (identified from morphology) with the changes since the last checklist labelled (Williams 1998). The subgenus Obertobombus (Reinig 1930) is included within the subgenus Sibiricobombus (Richards 1968), based on evidence from morphology (Richards 1968; Williams 1991) and from genes (Cameron et al. 2007; Williams et al. 2008, 2022). The species of Obertobombus are recognised here as part of the sibiricus -group of species. sibiricus -group Bombus sibiricus (Fabricius, 1781) = melinoides Fischer de Waldheim, 1843 = flaviventris Friese, 1905 = ochrobasis Richards, 1930 = nikiforuki Tkalců, 1961 Bombus semenovi Morawitz, 1887 stat. rev. = xionglaris Wang, 1982 syn. nov. = duanjioaoris Wang, 1982 syn. nov. = zhadaensis Wang, 1982 syn. nov. Bombus oberti Morawitz, 1883 = apicatus Friese, 1911 syn. nov. = griseofasciatus Reinig, 1930: 108, not of Reinig, 1930: 83 morawitzi -group Bombus morawitzi Radoszkowski, 1876 = oppositus Smith, 1878 = hydrophthalmus Morawitz, 1883 niveatus -group Bombus sulfureus Friese, 1905 = aureocorbicularis Pittioni, 1937 Bombus niveatus Kriechbaumer, 1870 = vorticosus Gerstaecker, 1872 = parnassius von Dalla Torre, 1882 = araraticus Radoszkowski, 1890 = pallidofasciatus Vogt, 1909 = postzonatus Vogt, 1911: 61, not of Vogt, 1911: 57 = skorikowi Friese, 1911 = iranensis Pittioni, 1937 = persicus Pittioni, 1937, not of Radoszkwski, 1881 = persiensis (Rasmont, 1983) asiaticus -group Bombus obtusus Richards, 1951 = badakshanensis (Tkalců, 1968) Bombus tescorum Williams nom. nov. et stat. rev. = miniatocaudatus Vogt, 1911, not of Vogt, 1909 Bombus longiceps Smith, 1878 stat. rev. = flavodorsalis (Skorikov, 1933), not of Franklin, 1913, syn. nov. = oshanini (Skorikov, 1933) syn. nov. = huangcens Wang, 1982 syn. nov. Bombus falsificus Richards, 1930 stat. rev. = heicens Wang, 1982 syn. nov. Bombus asiaticus Morawitz, 1875 = bizonatus Smith, 1878, syn. nov. = regeli Morawitz, 1880 = pamirensis Friese, 1913 = diversocaudatus Reinig, 1932 = flavicollis Wang, 1985 = baichengensis Wang, 1985 Key to species for females of the subgenus Sibiricobombus Future identification of species of the subgenus Sibiricobombus will be most reliable for specimens from which COI-barcode-like data are available for comparison of nucleotide differences with the reference data in our Supp. file 1. Keys using morphological skeletal shape, surface sculpturing, and hair-colourpattern characters follow below. The couplets of the keys are differential diagnoses, in that (because of variation) for each couplet, it is the best fit for the majority of characters (and especially for those near the beginning of the couplet) that points to a decision for progressing to the next numbered couplet or to a species’ identification. Our results imply that in some cases (in at least one sex) we should be able to assign most reliably the specimens with locality labels to the next couplets or to species on the basis of their collection locality alone. All identifications of species from the key or from the figures should be checked against the species’ diagnoses within the accounts of each species. Diagrams showing the major aspects of variation in the colour-patterns of the dorsal hair are presented in Figs 12‒89. These diagrams summarise only the major differences (Williams 2007) rather than finer details (e.g., Williams 1991: figs 371‒391). This is a simplification to aid quantitative comparisons and inevitably requires compromises. Colour-pattern variation within species is established with reference to particular individuals identified whenever possible from COI barcodes for each diagram. Morphology of the male genitalia is illustrated in Figs 90‒100. 1. Thoracic dorsum with the hair anterior to the wing bases and T1‒2 orange-red ................................ ...................................................................................................... B. morawitzi Radoszkowski, 1876 – Thoracic dorsum with the hair anterior to the wing bases and T1‒2 either yellow or white or black ........................................................................................................................................................... 2 2. From the region including Iran and Europe to its west .................................................................... 3 – From the region including Afghanistan and Asia to its east ............................................................. 4 3. Metasomal T4‒5 with the hair orange-red; clypeus in its centre with few widely spaced large punctures but with many more small punctures, often spaced by only their own diameters, so that much of the surface between the large punctures is uneven and locally convex (not flat, smooth and shining); hindleg basitarsus outer surface with the short branched hairs long so that they are just overlapping and the shining surface is partly obscured .................. B. niveatus Kriechbaumer, 1870 – Metasomal T4‒5 with the hair yellow; clypeus in its centre with few widely spaced large punctures and few small punctures, so that much of the surface between the large punctures is flat, smooth and shining; hindleg basitarsus outer surface with the short branched hairs so short that they are not overlapping and the surface is conspicuously brightly shining ................. B. sulfureus Friese, 1905 4. Metasomal T3 with the hair entirely yellow ........................................ B. sibiricus (Fabricius, 1781) – Metasomal T3 with the hair either black or orange or white, at most with a narrow posterior yellow fringe ................................................................................................................................................. 5 5. Antennal A3 length ≤2× greatest breadth; hind basitarsus outer surface with the short hairs dense and strongly overlapping so that reflections from the outer surface are partly obscured and only weakly visible; (in large individuals) T6 subapically medially with a longitudinal groove ......................... 6 – Antennal A3 length ≥ 2.5 × greatest breadth; hind basitarsus outer surface with the short hairs not especially dense and weakly overlapping so that reflections from the outer surface are clearly visible; (in large individuals) T6 subapically medially with a raised boss .................................................... 7 6. Labral furrow broad, 0.35 × the entire breadth of the labrum; hair of T3 often extensively orange, T4‒5 dull orange (Qinghai-Tibetan Plateau) .......................... B. semenovi Morawitz, 1887 stat. rev. – Labral furrow narrow, 0.25 × the entire breadth of the labrum; hair of T3 black at most with a narrow posterior pale fringe, T4‒5 either dull orange or dark brown or black (Tian Shan, Pamir) ............... ..................................................................................................................... B. oberti Morawitz, 1883 7. Hindleg basitarsus outer surface with few widely separated non-overlapping short weakly branched pale hairs so that the surface is conspicuously brightly shining; hair of T4 black at most with a few white hairs along the posterior margin (Afghanistan) .............................. B. obtusus Richards, 1951 – Hindleg basitarsus outer surface with many overlapping short weakly branched pale hairs so that the surface is partly obscured and weakly shining; hair of T4 either black or orange or white ............ 8 8. Clypeus with the anterior lateral corners with a small patch of large punctures spaced by their own breadths with only a very few widely spaced small punctures between them; T2 with the hair dorsally almost entirely yellow without black hairs even in the posterior lateral quarter (Xizang, Qinghai, Gansu) ...................................................................................... B. falsificus Richards, 1930 stat. rev. – Clypeus with the anterior lateral corners with a large patch of large punctures spaced by their own breadths with a dense patch of many small and medium punctures between them; T2 with the hair dorsally with some black hairs along the posterior margin or in the posterior lateral quarter ......... 9 9. Ocello-ocular area with a broad band of dense fine punctures along the inner eye margin, this band along its inner edge without medium and large punctures; hair beneath the base of the hind wing either usually yellow or white or rarely black, thoracic dorsum either bright yellow or bright yellow with a black band between the wing bases or white with a black band between the wing bases, T4‒5 either predominantly white or orange-red or black but usually not noticeably paler at the tips (China, Central Asia, India) ......................................................................................................................... 10 – Ocello-ocular area with a broad band of dense fine punctures along the inner eye margin, this band along its inner edge with a few medium and large punctures; hair beneath the base of the hind wing usually black, thoracic dorsum either dull yellow with a black band between the wing bases or almost entirely black, T4‒5 pale pinkish-orange, the hairs often conspicuously paler at the tips (Mongolia, Russia) .......................................................................... B. tescorum Williams nom. nov. et stat. rev. 10. Hind tibia outer corbicular surface in its upper proximal half weakly sculptured and smooth, so that the shining reflections are scarcely interrupted by the sculpturing; T2 with the hair either usually nearly entirely yellow without black ha