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Observation: Unknown
Primary Observer:
Terry Dieckhoff
Event Date:
2025-07-19
Status:
Unverified
Survey
Site Name:
My Home
Province/State:
Illinois
Event Date:
2025-07-19
Time of Day:
Night-Time
Start Time:
20:44
End Time:
20:54
Number of Observers:
4
Primary Observer:
Terry Dieckhoff
Additional Observers:
Pat Dieckhoff, Sara, Frank
Target Species Genus:
unknown
Target Species Species:
unknown
Location and Habitat
Location Accuracy (meters):
100-250
Habitat Type:
Developed - Sub/urban areas; parks/gardens
Habitat Type Notes:
Elevation (meters):
274 meters
Area Searched (hectares):
.105 hectares
Artificial Light Sources
Vehicles: No
Street Lights: No
Buildings: No
Street Lights: No
Buildings: No
Artificial Light Types
Sky Glow (diffuse illumination in the sky): No
Light Trespass (light cast on surfaces beyond its intended target): No
Glare (bright light causing visual discomfort): No
Light Trespass (light cast on surfaces beyond its intended target): No
Glare (bright light causing visual discomfort): No
Artificial Light Notes:
Observation
Observation Type:
Flashing
Number Observed:
50+
Genus:
unknown
Species:
unknown
Observation Notes:
Specimen Voucher Number:
Flash Behavior
First Flash Time:
20:50
Last Flash Time:
21:00
First Flash Temp (F):
78
Last Flash Temp (F):
78
Flashes in Pattern:
1
Flash Color:
Yellow
Flash Pattern Period:
2
Flash Duration:
1
Flash Interval:
1
Male Height Zone:
Moderate (3-8 ft)
Flash Location:
Flashes were in the open. Tree overhead and bushes on either side and garden in the back.
Male Flash Behavior:
Female Flash Behavior:
1 thought on “Observation: Unknown”
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Thank you for submitting this firefly observation! The yellow flash color and the early evening display timing suggest that you observed fireflies in the genus Photinus. The most likely species, especially given location and the suburban setting, is the big dipper firefly (Photinus pyralis), but close-up photos of the beetle in hand would be helpful for confirmation. The flash pattern period that you noted (2 seconds) would be shorter than typical for Photinus pyralis (3-7 seconds, depending on temperature). Little gray fireflies (Photinus marginellus) are also relatively common in your region.