Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Calendar
Upcoming Events

Discussion, insects and people from the 2018 BugGuide Gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama

Photos of insects and people from the 2011 gathering in Iowa

Photos from the 2010 Workshop in Grinnell, Iowa

Photos from the 2009 gathering in Washington

TaxonomyBrowse
Info
ImagesLinksBooksData

Species Petrophila bifascialis - Two-banded Petrophila - Hodges#4774

Moth? - Petrophila bifascialis Two-banded Petrophila  - Petrophila bifascialis Petrophila bifascialis Petrophila bifascialis Two-banded Petrophila, #4774 - Petrophila bifascialis Two-banded Petrophila - Petrophila bifascialis Petrophila bifascialis Two-banded Petrophila - Hodges#4774 - Petrophila bifascialis
Show images of: caterpillars · adults · both
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Lepidoptera (Butterflies and Moths)
Superfamily Pyraloidea (Pyralid and Crambid Snout Moths)
Family Crambidae (Crambid Snout Moths)
Subfamily Acentropinae
Tribe Argyractini
Genus Petrophila
Species bifascialis (Two-banded Petrophila - Hodges#4774)
Hodges Number
4774
Synonyms and other taxonomic changes
original combination Cataclysta bifascialis Robinson, 1869 (description)
* phylogenetic sequence # 143975
Explanation of Names
BIFASCIALIS: from "bi" (two) + "fascia" (band, bundle); refers to the bands across the median area of both wings, and is the origin of the suggested common name above
Size
wingspan 11-24 mm (1)
TL ≈ 7-12mm (2)
Identification
Adult:
forewing whitish with broad brownish-orange band across median area, and 3 smaller bands at varying angles near apex; hindwing white with broad orange band bordered distally (and sometimes proximally) by grayish band in median area, , and a line of large black spots along outer margin. See Heppner's description(3)
Peppery white FW with double brown median band and three angled dashes at apex. HW has row of black and silver spots along outer margin (2)
Range
eastern North America: Nova Scotia to Florida, west to Texas, north to Ontario
Habitat
larvae are aquatic, living in silken webs in fast-flowing streams
adults rest on nearby vegetation during the day, become active at night, and are attracted to light
Season
adults fly from late May to September
Food
larvae feed on diatoms and algae scraped from rocks in fast-flowing streams (1) (and Illinois Dept. of Natural Resources)
Remarks
I have found this marking the most helpful - on the hind-wing "an oblong black discal spot"
See Also
Petrophila fulicalis has 3 dark spots arranged in triangle on forewing (lacking in P. bifascialis)
Petrophila canadensis hindwing has dark speckling near apex, and a white space between two reddish bands in median area
Internet References
pinned adult image by John Glaser, plus flight season and distribution (Larry Line, Maryland)
pinned adult image and photos of related species by Jim Vargo (Moth Photographers Group)
presence in Texas; list (Dale Clark, Texas)
presence in Florida; list (John Heppner, Florida State Collection of Arthropods)
presence in Ontario; list (NHIC; Ontario Ministry of Natural Resources)
Works Cited
1.Field Guide to Moths of Eastern North America
Charles V. Covell, Jr. 2005.
2.Peterson Field Guide to Moths of Northeastern North America
David Beadle and Seabrooke Leckie. 2012. Houghton Mifflin.
3.Synopsis of the genus Parargyracytis (Lepidoptera: Pyralydae: Nymphulinae) in Florida
John B. Heppner. 1976. The Florida Entomologist, volume 59, number 1.