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Observation: Photinus pyralis
Primary Observer:
Roger
Event Date:
2025-07-15
Status:
Verified
Survey
Site Name:
Rocktown
Province/State:
Illinois
Event Date:
2025-07-15
Time of Day:
Night-Time
Start Time:
20:50
End Time:
21:00
Number of Observers:
1
Primary Observer:
Roger
Additional Observers:
NA
Target Species Genus:
Photinus
Target Species Species:
pyralis
Location and Habitat
Location Accuracy (meters):
>1000
Habitat Type:
Developed - Sub/urban areas; parks/gardens
Habitat Type Notes:
Elevation (meters):
207
Area Searched (hectares):
1
Artificial Light Sources
Vehicles: No
Street Lights: No
Buildings: Yes
Street Lights: No
Buildings: Yes
Artificial Light Types
Sky Glow (diffuse illumination in the sky): Yes
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:
2-10
Genus:
Photinus
Species:
pyralis
Observation Notes:
During each observatipn period I saw only 5-6 flashing. In most cases is was very long periods between flashes and they were not far off the ground.
Specimen Voucher Number:
Flash Behavior
First Flash Time:
20:50
Last Flash Time:
21:00
First Flash Temp (F):
87
Last Flash Temp (F):
83
Flashes in Pattern:
1
Flash Color:
Yellow
Flash Pattern Period:
short
Flash Duration:
1
Flash Interval:
sometimes more than 5 seconds
Male Height Zone:
Moderate (3-8 ft)
Flash Location:
Most were close to the ground
Male Flash Behavior:
Female Flash Behavior:
1 thought on “Observation: Photinus pyralis”
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Thank you for submitting this firefly observation! Despite the lack of a photo of the firefly, I agree that these were Photinus pyralis based on the timing between the single flashes, the low height of the flashes, the yellow flash color, and the early evening display time.