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Observation: Photuris pensylvanica
Primary Observer:
Casey B Main
Event Date:
2025-06-18
Status:
Unreviewed
Survey
Site Name:
Province/State:
Pennsylvania
Event Date:
2025-06-18
Time of Day:
Night-Time
Start Time:
21:45
End Time:
22:00
Number of Observers:
1
Primary Observer:
Casey B Main
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:
Grasses in the yard. Surrounding area includes multiflora rose, other shrubbery, maples, oaks, etc.
Elevation (meters):
339
Area Searched (hectares):
0.3
Artificial Light Sources
Vehicles: No
Street Lights: Yes
Buildings: No
Street Lights: Yes
Buildings: No
Artificial Light Types
Sky Glow (diffuse illumination in the sky): Yes
Light Trespass (light cast on surfaces beyond its intended target): Yes
Glare (bright light causing visual discomfort): No
Light Trespass (light cast on surfaces beyond its intended target): Yes
Glare (bright light causing visual discomfort): No
Artificial Light Notes:
The lights do not reach into my backyard. The streetlights illuminate a good portion of the front yard. A majority of the firefly activity is occurring in the back, but front observations seen to lesser degree.
Observation
Observation Type:
Flashing
Number Observed:
50+
Genus:
Photuris
Species:
pensylvanica
Observation Notes:
Fairly consistent flashing. Mostly in the wooded and shrubby areas surrounding yard. Some taking advantage of using the longer grassy patches and canes I allow to grow.
Specimen Voucher Number:
Flash Behavior
First Flash Time:
21:45
Last Flash Time:
22:00
First Flash Temp (F):
71
Last Flash Temp (F):
71
Flashes in Pattern:
1
Flash Color:
Yellow
Flash Pattern Period:
0.5
Flash Duration:
0.5
Flash Interval:
3
Male Height Zone:
Moderate (3-8 ft)
Flash Location:
Flashes were occurring in shrubbery and higher grass or wooded areas.
