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Observation: Photinus pyralis
Primary Observer:
Jayme
Event Date:
2025-06-09
Status:
Verified
Survey
Site Name:
Province/State:
Maryland
Event Date:
2025-06-09
Time of Day:
Night-Time
Start Time:
20:30
End Time:
20:35
Number of Observers:
2
Primary Observer:
Jayme
Additional Observers:
Sean
Target Species Genus:
unknown
Target Species Species:
Location and Habitat
Location Accuracy (meters):
0-25
Habitat Type:
Developed - Sub/urban areas; parks/gardens
Habitat Type Notes:
Clover, oak, maple. In our backyard on almost an acre of land.
Elevation (meters):
4
Area Searched (hectares):
Artificial Light Sources
Vehicles: No
Street Lights: No
Buildings: Yes
House lights but inside, currently no porch lights on
Street Lights: No
Buildings: Yes
House lights but inside, currently no porch lights on
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:
11-50
Genus:
Photinus
Species:
pyralis
Observation Notes:
When several were in close proximity, one would flash, then a second, then a third in about 3 seconds. One seemed to flash every 5-7 seconds. We have a lot of fireflies, several dozen in our backyard alone
Specimen Voucher Number:
Flash Behavior
First Flash Time:
20:30
Last Flash Time:
20:49
First Flash Temp (F):
75
Last Flash Temp (F):
75
Flashes in Pattern:
1
Flash Color:
Green
Flash Pattern Period:
5-7
Flash Duration:
1
Flash Interval:
5-7
Male Height Zone:
Low (0-3 ft), Moderate (3-8 ft)
Flash Location:
On their abdomen?
They would stick to around the fence of our backyard and as it gets darker they come inwards
