Subtribe Calaphidina
a member of Aphids Family Aphididae

https://influentialpoints.com/Gallery/Calaphis_aphids.htm

margaret_eaglecap added an identification
Undergreen Willow - Photo (c) Mike LaBarbera, some rights reserved (CC BY-NC-ND)

Undergreen Willow
(Salix commutata)
Hi, Bebb's would have a glaucous leaf back. S. commutata has a green leaf back, wide elliptic leaves, and leaf surfaces similarly white hairy.

https://linnet.geog.ubc.ca/Atlas/Atlas.aspx?sciname=Salix%20commutata&redblue=Both&lifeform=4