This was held on the CSUDH campus on Saturday March 29th, and at the Gardena Willows Wetland Preserve on Sunday the 30th.

Here are some of the photos (not just of butterflies) taken during the count.
(click on a thumbnail to open a larger image in a new window)
At Dominguez Hills
47 individuals of 11 spp
Gulf Fritillary on Bougainvillea
Eight-barred Lygropia Moth in the wetland
Pollinators doing their thing. Honeybee on willow (above) and unknown wasp and beetle on a chrysanthemum (left).
A western fence-lizard - interested in insects smaller than a butterfly
At the
Gardena Willows Wetland Preserve
180 individuals of 12 spp
Cabbage white on wild radish
Cloudless sulphur on Hooker's primrose
Fatal metalmark
on CA encelia
Jumping spider (unknown sp 1)
Jumping spider (unknown sp 2)
Fly (unknown sp)
7-spot lady beetle
Honeybee swarm
Fiery skipper on encelia
Umber skipper
on tidy tips
on wild radish
Marine blue (female)
Valley carpenter bee (female)
Western tiger swallowtail
CSUDH Campus
Western Tiger Swallowtail     2
Cabbage White                        8
Cloudless Sulphur                    1
Gulf Fritillary                         11
American Lady                         2
Monarch                                  14
Funereal Duskywing                  1
Northern White-skipper          1
Fiery Skipper                           5
Sandhill Skipper                       1
Umber Skipper                         1
Gardena Willows Wetland Preserve
Anise Swallowtail                   2
Western Tiger Swallowtail    5
Cabbage White                     30
Cloudless Sulphur                 23
Gray Hairstreak                      1
Western Pygmy-Blue               2
Marine Blue                             8
Fatal Metalmark                     1
Gulf Fritillary                       47
Monarch                                  5
Fiery Skipper                        18
Umber Skipper                      38