Bombus caliginosus ( Frison, 1927 )
publication ID |
https://doi.org/10.3897/jhr.98.163217 |
publication LSID |
lsid:zoobank.org:pub:25F6E6F3-B042-4A6E-AEFE-350FF940BC65 |
DOI |
https://doi.org/10.5281/zenodo.17295827 |
persistent identifier |
https://treatment.plazi.org/id/805A7092-3F4D-5115-840E-BA543066E8CE |
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Bombus caliginosus ( Frison, 1927 ) |
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Bombus caliginosus ( Frison, 1927) View in CoL , nomen protectum
Bombus flavifrons Smith, 1866 View in CoL , in Lord, 1866: 343 (appendix) [ ♀]. Preoccupied, not Bombus flavifrons Cresson, 1863 View in CoL . Neotype: ♀ (designated here; Fig. 1 View Figure 1 ). Canada, British Columbia, Vancouver Island, Victoria [Island] , Butchart Gardens , 30 May 1973, by S. Gittelman [American Museum of Natural History, no. AMNH_BEE 00120464 ] .
Bombus columbicus Dalla Torre, 1890: 139. Replacement name for Bombus flavifrons Smith, 1866. Nomen oblitum. View in CoL
Bremus caliginosus Frison, 1927: 376 [ ♂]. Syn. nov. Holotype: ♂. USA, California, Arcata, 16 September 1920, by C. D. Duncan [Illinois Natural History Survey, no. 179514]. View in CoL
Bremus caliginosus var. tardus Frison, 1927: 380 [ ♂]. Synonymy of Bremus caliginosus Frison, 1927 by Stephen (1957: 100). Holotype: ♂. USA, California, Carmel, 20 July 1921, by L. S. Slevin [California Academy of Sciences no. 2438]. View in CoL
Remark.
The original description of Bombus flavifrons Smith was of a female with a body length of 8 ½ lines (ca 18 mm), consistent with the neotype selected here (Fig. 1 View Figure 1 ).
Diagnosis.
Females of B. caliginosus have a longer malar space (length: width = 0.90, Fig. 2 a View Figure 2 ) than those of B. vosnesenskii (length: width = 0.71, Fig. 2 b View Figure 2 ) and in many specimens sternum 4 of the former has a weak apical (posterior) band of pale hairs, at least laterally ( Thorp et al. 1983; Williams et al. 2014) (Fig. 1 d View Figure 1 ), though as cautioned by Williams et al. (2014) this is also true for some specimens of B. vosnesenskii . Williams et al. (2014) also noted that tergum 4 of B. caliginosus often has some dark hairs basally, especially medially, while in B. vosnesenskii the black hairs are lacking, or few. Stephen (1957) noted that the relative lengths of flagellomeres 1 and 3 also differed, flagellomere 1 longer than 3 (3: 2) in B. caliginosus , but the lengths are subequal in B. vosnesenskii . Williams et al. (2014) made note of the size differences of punctures on the apical margin of the clypeus, being small in B. caliginosus , but large in B. vosnesenskii .
Males of the two species can be also distinguished by the relative lengths of flagellomeres 1 and 3, the lengths being subequal in B. caliginosus , but flagellomere 1 shorter than 3 in B. vosnesenskii ( Stephen 1957; Thorp et al. 1983). The males also differ in the shape of the apical recurved portion of the penis-valve head, narrowing apically in B. vosnesenskii , but remaining subparallel in B. caliginosus ( Stephen 1957; Williams et al. 2014). Thorp et al. (1983) also provided illustrations noting differences in the shapes of sterna 7 and 8, the latter gradually narrowing apically (i. e., triangular) in B. caliginosus (their fig. 63), while widely truncate apically in B. vosnesenskii , with the lateral margins subparallel to base of process (their fig. 72).
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Bombini |
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Bombus caliginosus ( Frison, 1927 )
Sheffield, Cory S., Heron, Jennifer M. & Williams, Paul H. 2025 |
Bremus caliginosus
Frison TH 1927: 376 |
Bremus caliginosus var. tardus
Stephen WP 1957: 100 |
Frison TH 1927: 380 |
Bombus columbicus
Dalla Torre KW 1890: 139 |
Bombus flavifrons
Bombus flavifrons Smith, 1866 , in Lord, 1866: 343 |