Bombus morrisoni Cresson
Morrisoni Cresson, 1878:183
DISTRIBUTION: W Nearctic Region, E Nearctic border.

Bombus robustus Smith
robustus Smith, 1854:400, examined

TAXONOMIC STATUS: See comments on B. hortulanus.

DISTRIBUTION: W Neotropical Region.

Bombus rohweri (Frison)
rohweri (Frison, 1925a:144 [Bremus]) examined

TAXONOMIC STATUS: B. funebris and B. rohweri have been regarded both as conspecific (Milliron, 1962) and as separate species (Frison, 1925a; Asperen de Boer, 1993a; G. Chavarría, pers. com.). They have been distinguished with reference to subtle morphological characters as well as to the consistently and strongly differing colour patterns. Both Asperen de Boer (1993a) and G. Chavarría (pers. com.) found that they co-occur at some localities without intermediate colour patterns. Further evidence is awaited.

DISTRIBUTION: W Neotropical Region.

Bombus rubicundus Smith
[Napensis Spinola in Osculati, 1850:201, published without description]
rubicundus Smith, 1854:400, examined

DISTRIBUTION: W Neotropical Region.

Bombus rufocinctus Cresson
rufo-cinctus [rufocinctus] Cresson, 1863:106

DISTRIBUTION: W Nearctic, E Nearctic, S Nearctic Regions.

Bombus tucumanus Vachal
tucumanus Vachal, 1904:10

DISTRIBUTION: W Neotropical Region, E Neotropical border.

Bombus vogti Friese
vogti Friese, 1903:254
nigrothoracicus Friese, 1904:188, examined

TAXONOMIC STATUS: B. vogti is closely similar in morphology to B. robustus, but has been considered to be a separate species (e.g. Milliron, 1973b; Asperen de Boer, 2007).

B. vogti and B. robustus are usually separated using colour. Although B. robustus is variable in colour, the name is applied to individuals with extensive yellow bands, whereas the name B. vogti is used for individuals that lack yellow bands and are often almost completely black. There is very little material available of the males, but the males of B. vogti are at most only subtly different in the morphology of the genitalia. While awaiting more evidence from critical studies of patterns of variation, I treat them initially as separate species.

TAXONOMIC STATUS: See comments on B. melaleucus.

DISTRIBUTION: W Neotropical Region.

Bombus bicoloratus Smith
bicoloratus Smith, 1879:132, examined
kulingensis Cockerell, 1917:266, examined
tajushanensis Pittioni, 1949:244
12 names

TAXONOMIC STATUS: B. kulingensis has been regarded as a species separate from B. bicoloratus (e.g. Williams, 1998).

B. bicoloratus and B. kulingensis show variation in the pattern of the teeth on the inner process of the gonostylus and on the outer margin of the penis valve head, and more especially in how pronounced is the outer lateral shoulder on the penis valve just anterior to the ventro-lateral process. However, from the material examined, I believe that B. kulingensis and B. bicoloratus are morphologically closely similar. Furthermore, evidence from comparisons of DNA sequences from five genes is consistent with the two taxa being conspecific (Cameron et al., 2007 [pdf]).

DISTRIBUTION: Oriental Region.

Bombus diversus Smith
diversus Smith, 1869:207, examined
tersatus Smith, 1869:207, examined
6 names

NOMENCLATURE: Tkalcu (1965) first explicitly regarded B. diversus and B. tersatus as conspecific and, following the Principle of First Reviser (ICZN, 1999: Article 24), chose B. diversus as the valid name for the species.

DISTRIBUTION: Oriental, Japanese, Palaearctic Regions.

Bombus irisanensis Cockerell
irisanensis Cockerell, 1910a:416, examined

DISTRIBUTION: Oriental Region.

IUCN CONSERVATION STATUS: Preliminary assessment as VULNERABLE (Williams & Osborne, 2009) by criterion A2 (IUCN, 2001, 2008) that no records are known since 1983.

Bombus koreanus (Skorikov)
koreanus (Skorikov, 1933a:59 [Hortobombus])
pekingensis Bischoff, 1936:21, examined
?notocastaneus Tkalcu, 1961a:52
4 names

TAXONOMIC STATUS: B. notocastaneus was described from a single male from Hubei. From the description, it appears most likely to be conspecific with B. koreanus. For a description of the variation in this species see Huang et al. (2014).

DISTRIBUTION: Oriental, Palaearctic Regions.

Bombus longipes Friese
longipes Friese, 1905:511
hummeli Bischoff, 1936:18, examined

DISTRIBUTION: Oriental Region, Palaearctic border.

Bombus melanopoda Cockerell
melanopoda Cockerell, 1910a:416, examined

DISTRIBUTION: Sumatran Region.

IUCN CONSERVATION STATUS: Preliminary assessment as presumed EXTINCT (Williams & Osborne, 2009) because it is unrecorded (IUCN, 2001, 2008) since Cockerell (1910) from the specimen of probably 1878-1883. Like most other Sumatran bumble bees (with the notable exception of the extensively greyish-white queens of B. senex, see Sianturi et al., 1995), the holotype of B. melanopoda is almost entirely black. It is likely that females of this species would be particularly easily mistaken for black individuals of B. senex (although males of B. melanopoda might be paler, as for B. koreanus).

Bombus religiosus (Frison)
religiosus (Frison, 1935:344 [Bremus]) examined

DISTRIBUTION: Oriental Region.

Bombus securus (Frison)
securus (Frison, 1935:346 [Bremus]) examined
yuennanicus Bischoff, 1936:23, examined

DISTRIBUTION: Oriental Region.