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I compared material of B. lanigerus and B. brunnipes from my collection. B. lanigerus is a long and dense haired species especially on lateral margins of first tergites, thorax, back auf head and legs, while B. brunnipes is allways thin and short haired as shown on the photographes. In addition the specific shape of front an hind tibia showing that is B. brunnipes. The shape of basitarus of hind tarsi seems to be quite variable in B. lanigerus. In my material the latest collecting date of B. lanigerus in higher altitude (1750 m) at snow border in 2024 was 10th of May.
Regards