April Bumble Bees In The Backyard - Chicago
Look at the size of these bumbles! Fat queens ready to lay a colony.
This one has me puzzled. A bald spot? Seemed very aggressive as well. Chased me and the camera inside.
ID of the bald spotted bee from UIUC Bee Spotter
Bombus bimaculatus - Twospotted Bumble Bee
Thanks for your message. The hairs that cover a bee's body are subject to wear, and when a bee gets older, it is not unusual for the thorax to get a bit bald dorsally. Plus remember, bumble bees that we are seeing now have been around since back in late summer 2008; the one that you photographed might have had something of a rough winter.
Best regards,Terry Harrison