Butterflies of Lancaster County, Pennsylvania ---- Sightings in 2011
Photographs of Lancaster County Butterflies from 2013       (2012 photos)       (2011 photos)  

(2010 photos)    Other year sightings     Berks Co. Butterfly Sightings

Lancaster Butterfly & Entomological Club     Berks Co. Butterfly Walks 2017

    The butterfly species with dates have been seen in Lancaster County, Pennsylvania this year. There are records of 109 species for Lancaster County. The list below includes all those seen in 2009 and 2010, a total of 74 species.  New species seen in 2011, but not in 2009 or 2010 will be added in red.

     Starting this year we are recording the first sighting for each month in order to have data over the season. 
If you have a reliable sighting not on this list for 2011, please send an email to . If you are not sure and have a photograph, send it. We'd appreciate your help. 
Sightings in 2011   ( 70 species)  --- 11 in November, 1 in December.
Latest report - Orange Sulphur  on Dec. 4                                     Last updated December 6, 2011.
This is the largest number of species in the four years of the Lancaster County listings. 
Thanks to all of our contributors.
The day of the first sighting is listed for each month .
Family HESPERIIDAE Mar Apr May Jun Jul Aug Sep Oct Last
1 Silver-spotted Skipper 9 10 9 1 1 5
- Southern Cloudywing (new to list) 23
2 Northern Cloudywing
3 Dreamy Duskywing  5
4 Sleepy Duskywing 9
5 Juvenal's Duskywing  9
6 Horace's Duskywing  9
7 Wild Indigo Duskywing 23 9 6 1
8 Common Checkered Skipper  9 1 13 1 4 Nov 25
9 Common Sootywing 2 3 1
10 Swarthy Skipper 11 3 1
11 Least Skipper  28 11 9 3 4
12 European Skipper 
13 Fiery Skipper  9 17 1 4 Nov 7
14 Cobweb Skipper  8
15 Peck's Skipper  10 11 9 1 1 5
16 Tawny-edged Skipper 26 11 1
17 Crossline Skipper  2
18 Long Dash 
19 Northern Broken Dash 
20 Little Glassy Wing 20 1
21 Sachem 9 16 1 11
22 Delaware Skipper 
23 Mulberry Wing 25
24 Hobomok Skipper  23
25 Zabulon Skipper  22 11 1 1
Broad-winged Skipper (new to list) 2
26 Black Dash  20
27 Dun Skipper  21 9 6
28 Dusted Skipper  23
Family PAPILIONIDAE Mar Apr May Jun Jul Aug Sep Oct Last
29 Pipevine Swallowtail  9 7
30 Zebra Swallowtail  24 9 10 9 6 1
31 Black Swallowtail  9 20 9 7 2 5
32 Giant Swallowtail  12 11
33 Eastern Tiger Swallowtail  24 9 11 9 1 1
34 Spicebush Swallowtail  9 11 9 1 1
Family PIERIDAE 
35 Cabbage Butterfly = Cabbage White  6 10 9 1 1 5 Nov 11
36 Falcate Orangetip 24
37 Clouded Sulphur  9 11 9 13 1 11 Nov 11
38 Orange Sulphur 9 11 9 1 1 5 Dec 4
39 Cloudless Sulphur Nov 9
40 Sleepy Orange  1 4 6
41 Dainty Sulphur 
Family LYCAENIDAE
42 Harvester 
43 American Copper  3 18 9
44 Bronze Copper 4
45 Banded Hairstreak  4
46 Red-banded Hairstreak 27 4 3 1
47 Juniper Hairstreak  23
48 Brown Elfin  9
49 Pine Elfin  9
50 White-m Hairstreak  4
51 Gray Hairstreak  26 9 9 6 1
52 Eastern Tailed Blue 9 20 9 1 1
53 Spring Azure  3 9
54 Summer Azure  26 11 1 1 1
- Appalachian Azure (new to list) 28
Family NYMPHALIDAE
 Subfamily LIBYTHEINAE 		 Mar Apr May Jun Jul Aug Sep Oct Last
55 Snout Butterfly  6 9 10
Subfamily HELICONIINAE
56 Variegated Fritillary 4 9 1 1 5 Nov 8
57 Great Spangled Fritillary 29 11 9 7 1
58  Meadow Fritillary 20 2 11 9 1 9 5
59  Silvery Checkerspot 28 9 1 4
Subfamily NYMPHALINAE
60 Pearl Crescent 24 9 9 1 1 5
61 Baltimore  19
62 Question Mark  9 19 9 1 18 5 Nov 5
63 Comma                          Feb 18 24 9 10 9 2 4
64 Mourning Cloak  3 28 11 Nov 2
65 American Painted Lady  24 9 1
66 Painted Lady  11 10 13 11
67 Red Admiral  24 3 9 1 1 11 Oct 30
68 Buckeye  28 10 9 1 1 5 Nov 11
69 Red-spotted Purple  22 10 9 9 1
70 Viceroy 11 9 4
Subfamily APATURINAE
71 Hackberry Butterfly 10 9 1 1
72 Tawny Emperor  30 10 9 6
Subfamily SATYRINAE
73 Appalachian Eyed Brown  11
74 Little Wood Satyr  23
75 Common Wood Nymph  21 9 13
Subfamily DANAINAE
76 Monarch 23 11 1 1 1 5
Monthly Totals 13 43 40 40 44 37 18

Yearly butterfly sightings in Lancaster County, Pennsylvania
2009 (67)
2010 (72)
2011 (70)
2012 (79)
2013 (75)
2014 (__)
2015 (60)
2016 (62)
2017 (61)
2018 (57)
2019 (58)
2020 (53)
2021 (61)
2022 (56+)
2023 (58)
2024 (--)
Contributors to this year's sightings for Lancaster County are: Fred Habegger, Jon Campbell, Tom Raub, Jim Smith, Alison Mallon, Ryan Woolwine, and Al Spoo. 
For Berks County, PA butterfly sightings go to Berks Butterfly Sightings - 2011.
A site with data on butterfly distributions by county (and photographs) for North America can be found at Butterflies and Moths of NA.   (http://www.butterfliesandmoths.org/)