The butterfly species in bold have been seen in Lancaster County, Pennsylvania in 2010. There are records of 109 species for Lancaster County. The list below includes all those seen in 2009, a total of 67 species. Species seen in 2010, but not in 2009 will be added in red. This project will allow us to learn what is currently living in or visiting Lancaster County. The date is the first reported. Printable list of the 109 at (Lancaster Butterflies).
If you have a reliable sighting not on this list for 2010, please send an email to. 
We welcome your help. 

 Family HESPERIIDAE (Skippers)
Silver-spotted Skipper       4/30
Northern Cloudywing 
Dreamy Duskywing            4/17
Sleepy Duskywing              4.17
Juvenal's Duskywing         4/16
Horace's Duskywing           7/15
Wild Indigo Duskywing    4/29
Checkered Skipper             6/20
Common Sootywing           6/26
Swarthy Skipper                 8/14
Clouded Skipper                 9/5
Least Skipper                       5/7
European Skipper               6/11
Fiery Skipper                       8/9
Cobweb Skipper                 4/30
Sachem                                 7/3
Peck's Skipper                     5/3
Tawny-edged Skipper       7/15
Crossline Skipper              6/10
Little Glassywing               6/14
Mulberry Wing                  6/26
Hobomok Skipper              5/8
Zabulon Skipper               5/4
Black Dash                         6/26 
Dun Skipper                      5/21
Dusted Skipper                 4/30

 Family PAPILIONIDAE (Swallowtails)
Pipevine Swallowtail             6/27
Zebra Swallowtail                  4/7
Black Swallowtail                  5/3
Eastern Tiger Swallowtail    4/6
Spicebush Swallowtail          4/17
Giant Swallowtail                  8/21

 Family PIERIDAE  (Whites & Sulphurs)
Cabbage White           3/18
Falcate Orangetip       4/7
Clouded Sulphur       4/11
Orange Sulphur         4/16
Sleepy Orange            7/8
Cloudless Sulphur    8/21
Dainty Sulphur          7/5  Very rare sighting (verified by photo, see photo) of this southern butterfly. Possibly the first in Lancaster Co. in 50 years. If you have a sighting, please let us know.

  Family NYMPHALIDAE (Brushfooted Butterflies)

 Subamily LIBYTHEINAE  (Snouts)
Snout Butterfly               6/25

 Subfamily NYMPHALINAE (Brushfooted Butterflies)
Variegated Fritillary           7/5
Great Spangled Fritillary  5/26
Meadow Fritillary              4/12
Silvery Checkerspot     7/15
Pearl Crescent               4/19
Baltimore
Common Buckeye        6/20
Question Mark             4/29
Eastern Comma            3/9
Mourning Cloak           3/9
Red Admiral                 5/1
Painted Lady                 5.8
American Lady             5/1
Red-spotted Purple      5/6
Viceroy                          5/8

 Subfamily APATURINAE  (Hackberry Butterflies)
Hackberry Butterfly    7/4
Tawny Emperor           7/4

 Subfamily SATYRINAE  (Satrys & Wood Nymphs)
Appalachian Brown        6/15
Little Wood Satyr            5/25
Common Wood Nymph  6/20

 Subfamily DANAINAE  (Milkweed Butterflies)
Monarch                        6/14