I have started to look at bumblebees a bit more closely this year and I've found that it's not as simple as if first appears. I found a couple of bumblebees today that resembled B. hortorum but something seemed a little different to the one's I've seen this year. I hoped that it might be B. jonellus and so I took a couple of photo's in hope that I could shore up the id later. Having consulted the books I can see that there are 2 possibilities. Males of B. lucorum and B. jonellus both show yellow hairs on the face as well as 2 bands of yellow on the thorax and 1 on the abdomen which also has a white tip.
The best separating feature for these species is that B. jonellus has long hairs on the dorsal edge of the hind metatarsus. The photo below seems to show these long hairs I would be very grateful if anyone could confirm whether I have made the correct identification of this bumblebee.