Peak Count Data for Butterflies at Fermilab Sorted by Scientific 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 Common Name - by Number Found in 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

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

*Colias philodice (Clouded Sulphur) and Colias eurytheme (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
eddata.fnal.gov/lasso/butterfly_search/peak_count_sn.lasso