Treebeard:
Maybe a Red-Cross Shield Bug (Elasmostethus cruciatus, Pentatomoidea, Hemiptera) on leaf of Branching Phacelia (Phacelia ramosissima var. latifolia, Hydrophyllaceae)
Treebeard:
Lace Bug (Tingidae, Hemiptera) on leaf of native Wild Sweetpea (Lathyrus latifolius, Fabaceae)
Treebeard:
Little "true bug" (Hemiptera) on new flowers of Hairy Ceanothus (Ceanothus oliganthus, Rhamnaceae) - maybe family Miridae?
Treebeard:
Stilt Bug (Berytidae, Hemiptera) on leaf of California Honeysuckle (Lonicera hispidula, Caprifoliaceae)
Treebeard:
Stilt Bug (Berytidae, Hemiptera) hanging on blade of native California Brome (Bromus carinatus, Poaceae) grass
Treebeard:
Another impossibly thin Stilt Bug (Berytidae, Hemiptera) on Golden Yarrow (Eriophyllum confertflorum, Asteraceae)
Treebeard:
Lace Bugs (Tingidae, Hemiptera) on Greenbark Ceanothus (Ceanothus spinosus, Rhamnaceae)
Treebeard:
Handsome "true bug" with 5-segmented antennae - a "stink bug" (Pentatomidae, Hemiptera)
Treebeard:
Impossibly thin Stilt Bug (Berytidae, Hemiptera) on native California Figwort (Scrophularia californica, Scrophulariaceae)
Treebeard:
Impossibly thin Stilt Bug (Berytidae, Hemiptera) on leaf of Canyon Lupine (Lupinus latifolius, Fabaceae)
Treebeard:
Bee Assassin (Apiomerus californicus, Reduviidae, Hemiptera) on Golden Yarrow (Eriophyllum confertflorum, Asteraceae)
Treebeard:
Tiny ant-like Assassin Bug (Reduviidae, Hemiptera) on Wild Blackberry (Rubus ursinus, Rosaceae)
Treebeard:
"Stink bug" (Pentatomidae, Hemiptera) - maybe a Red-shouldered Stink Bug in the genus Thyanta
Treebeard:
Assassin Bug (Reduviidae, Hemiptera) on a leaf of Coast Live Oak (Quercus agrifolia, Fagaceae)
Treebeard:
"True bug" (Hemiptera) hiding in the throat of a Bush Monkey Flower (Mimulus longiflorus, Scrophulariaceae) - maybe Closterocoris amoenus, Miridae?
Treebeard:
Ambush Bug (Phymatidae, Hemiptera) with a tiny beetle for prey - in flowers of California Buckwheat (Eriogonum fasciculatum, Polygonaceae)
Treebeard:
Bee Assassin (Apiomerus californicus, Reduviidae, Hemiptera) on flowers of Coyote Mint (Monardella hypoleuca, Lamiaceae)
Treebeard:
Wicked-looking Ambush Bug (Phymatidae, Hemiptera) with a tiny beetle (Coleoptera) for prey, on native California Buckwheat (Eriogonum fasciculatum, Polygonaceae)
Treebeard:
Ambush Bug (Phymatidae, Hemiptera) on California Buckwheat (Eriogonum fasciculatum, Polygonaceae) - probably the Pacific Ambush Bug (Phymata pacifica)
Treebeard:
Yellow "true bug" (Hemiptera) on flower of Coyote Mint (Monardella hypoleuca, Lamiaceae) - I guess family Miridae
Treebeard:
Perfectly camouflaged Ambush Bug (Phymatidae, Hemiptera) on new summer flowers of California Buckwheat (Eriogonum fasciculatum, Polygonaceae) - probably Pacific Ambush Bug (Phymata pacifica)