Most bees come out only during mid-day. In fact, I usually don't start catching any bees with a net until at least 9 and in cooler environments it can be even later. Different story in the tropics many bees are out, starting at dawn (but that is another story). A few bees reverse those times and come out only in the late evening, early morning, and very rarely on well lit nights (but that is another story). Its all about the flowers, of course. In eastern North America you don't have much of this early morningness with the exception of the squash bees (in northern areas they are there only artificially maintained by our habits of planting squash and pumpkins for them, but that is another story) and...Cemolobus ipomoeae, pictured here like an elfin dragon stead. It, is a fan of Ipomoeae pandurata. Manroot. It seems to ignore the other (native and non-native) Ipomoeae plants (unlike Melitoma...but that is another story). It rarely is captured, but is it rare, or do beeologists just not get up early and look? BTIAS