Peak Count Data for Butterflies at Fermilab Sorted by Common Name

A list of butterflies Tom Peterson observed on the 6800 acre Fermilab site, 40 miles west of Chicago, Illinois.

Each time Tom went butterfly watching, he counted the number he saw per hour of each species. At the end of each summer, he made a chart with the day on which he saw the maximum number of each species ("date recorded" below) and the number he saw ("peak count per hour") for that species.

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Butterfly Data - Peak Count by Scientific Name - by Number Found for 1999 - 2000 - 2001 - 2002 - 2003

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Butterfly Species	Date Recorded	Peak Count per hour	for 1999   for 2000   for 2001   for 2002   for 2003

Acadian Hairstreak Satyrium acadica	06/23/1999 1   07/08/2001 1   07/03/2002 1   07/09/2003 1
American Lady Vanessa virginiensis	06/07/2000 1   05/17/2001 5   05/03/2002 2   04/25/2003 1
American Snout Libytheana carinenta	07/21/2000 1   09/29/2001 1
Banded Hairstreak Satyrium calanus	06/21/1999 5   06/22/2000 2   06/25/2001 5   07/14/2002 1   07/14/2003 4
Black Dash Euphyes conspicua	07/06/1999 2   07/07/2000 2   07/13/2001 2   07/12/2002 2   07/16/2003 1
Black Swallowtail Papilio polyxenes	08/17/1999 2   08/30/2000 2   08/04/2001 12   07/20/2002 2   06/25/2003 3
Bronze Copper Lycaena hyllus	06/08/1999, 08/16/1999 3   08/07/2000 3   08/03/2001 5   09/11/2002 1   07/29/2003 3
Cabbage White Pieris rapae	06/21/1999 30   08/11/2000 20+ + 08/04/2001 30+ + 08/25/2002 20+ + 09/06/2003 12
Checkered White Pontia protodice	09/05/2001 1
Clouded Sulphur* Colias philodice	07/06/1999 19   09/27/2000 20+ + 08/26/2001, 09/11/2001 11   08/25/2002, 09/24/2002 30+ + 10/11/2003 10
Common Buckeye Junonia coenia	07/06/1999 7   08/06/2000 4   09/11/2001 7   09/30/2002 2
Common Checkered-Skipper Pyrgus communis	07/11/2000 1
Common Sootywing Pholisora catullus	08/26/2001 1   06/07/2003 1
Common Wood-Nymph Cercyonis pegala	07/06/1999 8   07/13/2000 13   07/08/2001 25   07/20/2002 12   07/29/2003 20+ +
Coral Hairstreak Satyrium titus	07/03/2000 5   06/30/2001 7   06/21/2002 3   07/13/2003 7
Dainty Sulphur Nathalis iole	09/15/1999 1   08/24/2001 1
Delaware Skipper Anatrytone delaware	07/07/2000 2   07/11/2001 2   07/20/2002 3   07/09/2003 1
Dion Skipper Euphyes dion	07/05/2001 12   07/16/2002 20   07/09/2003 3
Dun Skipper Euphyes vestris	06/21/1999 1   08/01/2000 3   07/13/2001 3
Eastern Comma Polygonia comma	08/01/2000 4   08/24/2001 15   09/20/2001 2   07/14/2002 2   04/15/2003 7
Eastern Tiger Swallowtail Papilio glaucus	08/10/1999 1   06/06/2000 1   07/31/2001 4   07/31/2002 3   08/10/2003 3
EasternTailed-Blue Everes comyntas	08/10/1999 15   08/11/2000 11   08/25/2002 20   07/29/2003 5
European Skipper Thymelicus lineola	06/21/1999 12   07/03/2000 6   06/21/2001 20+ + 06/21/2002 11   06/24/2003 10
Eyed Brown Satyrodes eurydice	07/06/1999 3   06/29/2000 4   07/08/2001 1   07/13/2003 5
Fiery Skipper Hylephila phyleus	08/16/1999 10   09/10/2000 2   08/26/2001 1   09/07/2002 2
Giant Swallowtail Papilio cresphontes	08/20/1999 1   07/25/2000 1   08/26/2001 1   08/25/2002 3   08/14/2003 3
Gray Comma Polygonia progne	08/04/2001 2   07/14/2002 2   07/07/2003 1
Great Spangled Fritillary Speyeria cybele	06/21/1999 8   06/22/2000 5   07/05/2001 11   07/03/2002 4   07/14/2003 10
Least Skipper Ancyloxypha numitor	06/08/1999 2   08/21/2000 20+ + 08/04/2001 20+ + 06/21/2002 5   06/24/2003 3
Little Glassywing Pompeius verna	06/22/2001 1
Little Wood-Satyr Megisto cymela	06/06/2000 1   06/12/2001 2   06/24/2003 10
Little Yellow Eurema lisa	06/08/1999, 07/06/1999 1   06/21/2002 1
Meadow Fritillary Boloria bellona	06/24/2001, 09/02/2001 5   06/28/2002 15   07/31/2003 20+ +
Monarch Danaus plexippus	09/10/1999 10+ + 09/28/2000 10+ + 09/11/2001 10+ + 10/10/2002 3   09/06/2003 5
Mourning Cloak Nymphalis antiopa	09/25/1999 2   06/07/2000 1   05/29/2001 2   04/15/2002 5   04/15/2003 3
Northern Broken-Dash Wallengrenia egeremet	07/14/2002 4
Northern Pearly-Eye Enodia anthedon	08/01/2000 4   07/08/2001 1   07/20/2002 15   07/14/2003 4
Orange Sulphur* Colias eurytheme	07/06/1999 19   09/27/2000 20+ + 08/26/2001, 09/11/2001 11   08/25/2002, 09/24/2002 30+ + 10/11/2003 10
Painted Lady Vanessa cardui	06/06/1999 1   08/06/2000 1   08/26/2001 10   10/06/2001 1   09/17/2003 20+ +
Pearl Crescent Phyciodes tharos	07/22/1999 6   07/11/2000 8   08/24/2001 19   08/25/2002 20   05/13/2003 20
Peck’s Skipper Polites peckius	09/30/1999 1   06/07/2000 6   06/12/2001 4   06/07/2002 3   06/20/2003 2
Pipevine Swallowtail Battus philenor	06/06/1999 1
Purplish Copper Lycaena helloides	09/07/1999 2   09/01/2000 9   09/11/2001 5   08/27/2002 3   09/09/2003 14
Question Mark Polygonia interrogationis	07/06/1999 4   06/30/2000 4   05/29/2001 9   09/08/2002 2   06/02/2003 1
Red Admiral Vanessa atalanta	09/10/1999 5+ + 06/06/2000 3   05/17/2001 20+ + 06/21/2002 1   07/29/2003 2
Red-Spotted Purple Limenitis arthemis	08/10/1999 2   07/24/2000 1   08/10/2001 4   07/31/2002 5
Sachem Atalopedes campestris	09/10/2000 1
Silver-Spotted Skipper Epargyreus clarus	06/06/2000 4   08/26/2001 7   07/31/2002 5   08/13/2003 5
Spring Azure Celastrina ladon	08/10/1999 3   08/06/2000 5   08/10/2001 3   07/12/2002 2   07/24/2003 2
Tawny-edged Skipper Polites themistocles	06/06/1999 4   06/07/2000 4   05/29/2001 2   06/07/2003 10
Variegated Fritillary Euptoieta claudia	08/26/2001 2
Viceroy Limenitis archippus	06/22/1999 6   08/24/2000 10   08/04/2001 18   07/20/2002 5   07/29/2003 3
Wild Indigo Duskywing Erynnis baptisiae	09/03/1999 1   09/09/2000 10+ + 09/20/2001 5   08/28/2002 3   10/13/2003 3

*Clouded Sulphur and Orange Sulphur are listed as separate species. Tom Peterson does not do separate counts for them since there are many intermediate-looking forms of them. He combines the data for both and the table above lists the same data for both species.

Butterfly Data Collection by: Tom Peterson
Web Maintainer: ed-webmaster@fnal.gov
Last Update: April 16, 2008
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