Sighting for April 18, 2016

David H. Bartholomew

San Bruno Mountain, Ridge Trail
San Mateo County, CA

10:45 - 3:30, pleasantly warm day, lots of flowers, a decent variety of butterflies. I was looking for Mission Blue (saw 16), San Bruno Silverspot (saw 1), and San Bruno Elfin (saw none). By far, the Chalcedon Checkerspot was most common.

  • Pipevine Swallowtail 3
  • Anise Swallowtail 30
  • Pale Swallowtail 12
  • Cabbage White 1
  • Bramble Hairstreak 3
  • Brown Elfin 2
  • Gray Hairstreak 1
  • Spring Azure 3
  • Boisduval's Blue 16
  • Callippe Fritillary 1
  • Field Crescent 5
  • Variable Checkerspot 57
  • American Lady 1
  • Common Buckeye 4
  • Mournful Duskywing 8
  • Common Checkered-Skipper 1

Callippe Fritillary

Boisduval's Blue

Variable Checkerspot