Observation: Photuris pensylvanica
Primary Observer:
JP
Event Date:
2026-07-30
Status:
Unreviewed
Survey
Site Name:
Undisclosed
Province/State:
Pennsylvania
Event Date:
2026-07-30
Time of Day:
Night-Time
Start Time:
20:40
End Time:
21:10
Number of Observers:
1
Primary Observer:
JP
Additional Observers:
NA
target_species_genus:
photuris
target_species_species:
pensylvanica
Location and Habitat
Location Accuracy (meters):
0-25
Habitat Type:
Developed - Sub/urban areas; parks/gardens
Habitat Type Notes:
Observation along creekside where mature Silver Maples are planted.
Elevation (meters):
394
Area Searched (hectares):
.40
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): 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:
Although sky glow, the lower elvevation observation area is dark.
Observation
Observation Type:
With Flash Data
Number Observed:
11-50
genus:
photuris
Species:
pensylvanica
Observation Notes:
Specimen Voucher Number:
Flash Behavior
First Flash Time:
20:40
Last Flash Time:
21:10
First Flash Temp (F):
79
Last Flash Temp (F):
78
Flashes in Pattern:
1
Flash Color:
Green
Flash Pattern Period:
five seconds
Flash Duration:
one second
Flash Interval:
one second
Male Height Zone:
Low (0-3 ft)
Flash Location:
Along creekside where mature Silver Maples are planted.
Male Flash Behavior:
There were two and three Fireflies synchronizing flashes: one flash followed by a j-streak upwards, a five-second pause, and repeated pattern eight times.
