Peak Count Data for Butterflies
at Fermilab with Remnant Status

A list of butterflies observed on the 6800 acre Fermilab site, 40 miles west of Chicago, Illinois.
A high concentration of these butterflies can indicate good quality natural habitat.

Butterfly SpeciesDate RecordedPeak Count
per hour
for 1999   for 2000   for 2001   for 2002   for 2003  

Acadian Hairstreak
Satyrium acadica
06/23/19991  
07/08/20011  
07/03/20021  
07/09/20031  
Banded Hairstreak
Satyrium calanus
06/21/19995  
06/22/20002  
06/25/20015  
07/14/20021  
07/14/20034  
Black Dash
Euphyes conspicua
07/06/19992  
07/07/20002  
07/13/20012  
07/12/20022  
07/16/20031  
Bronze Copper
Lycaena hyllus
06/08/1999,
08/16/1999
3  
08/07/20003  
08/03/20015  
09/11/20021  
07/29/20033  
Coral Hairstreak
Satyrium titus
07/03/20005  
06/30/20017  
06/21/20023  
07/13/20037  
Dion Skipper
Euphyes dion
07/05/200112  
07/16/200220  
07/09/20033  
Eyed Brown
Satyrodes eurydice
07/06/19993  
06/29/20004  
07/08/20011  
07/13/20035  
Great Spangled Fritillary
Speyeria cybele
06/21/19998  
06/22/20005  
07/05/200111  
07/03/20024  
07/14/200310  
Least Skipper
Ancyloxypha numitor
06/08/19992  
08/21/200020+ +
08/04/200120+ +
06/21/20025  
06/24/20033  
Meadow Fritillary
Boloria bellona
06/24/2001,
09/02/2001
5  
06/28/200215  
07/31/200320+ +
Northern Pearly-Eye
Enodia anthedon
08/01/20004  
07/08/20011  
07/20/200215  
07/14/20034  
Pipevine Swallowtail
Battus philenor
06/06/19991  
Purplish Copper
Lycaena helloides
09/07/19992  
09/01/20009  
09/11/20015  
08/27/20023  
09/09/200314  
Viceroy
Limenitis archippus
06/22/19996  
08/24/200010  
08/04/200118  
07/20/20025  
07/29/20033  
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