Parade of pollinators

Wild roses are blooming in Discovery Park, and an amazing variety of insects are flying up to feed from them. Here's a sampling with speculations on the animals' identities.

Looks like genus Megachile to me, perhaps a leaf-cutter bee.



Genus Bombus. Maybe a yellow-faced bumble bee?



Another Bombus. Red-belted bumble bee, I think.


Flower longhorn beetle and, um, some kind of small stripy not-very-hairy bee. A resin bee, perhaps, such as Dianthidium?