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For the United States & Canada
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Upcoming Events

Photos of insects and people from the 2022 BugGuide gathering in New Mexico, July 20-24

National Moth Week was July 23-31, 2022! See moth submissions.

Photos of insects and people from the Spring 2021 gathering in Louisiana, April 28-May 2

Photos of insects and people from the 2019 gathering in Louisiana, July 25-27

Photos of insects and people from the 2018 gathering in Virginia, July 27-29

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

Previous events


Genus Furcula

Zigzag Furcula Moth - Furcula scolopendrina Furcula scolopendrina - female Furcula borealis Zigzag Furcula Moth - Furcula scolopendrina Furcula modesta  - Furcula modesta Notodontidae: Furcula modesta - Furcula modesta Furcula cinerea - Gray Furcula - Furcula cinerea Furcula? - Furcula furcula
Show images of: caterpillars · adults · both
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Lepidoptera (Butterflies and Moths)
Superfamily Noctuoidea (Owlet Moths and kin)
Family Notodontidae (Prominent Moths)
Subfamily Cerurinae
Genus Furcula
Explanation of Names
FURCULA: from the Latin "furca" (a fork); refers to the long forked anal prolegs of the larva
6 species in North America (
5 species in Canada (CBIF)
wingspan 30-45 mm
Adult: forewing white to off-white to gray (with dark gray patches in median area and along costa near apex in 4 species); AM and terminal lines composed of black dots; some yellowish or orange markings usually present in 4 species; hindwing white or pale grayish with terminal line of black dots and usually dark discal spot

Larva: body greenish-yellow to green with bluish-green or brown saddle in middle of back; anal prolegs modified into pair of long narrow tail-like projections, giving the appearance of a forked tail
all of United States and southern Canada, plus southern Yukon and Northwest Territories - varies according to species
F. borealis: eastern 2/3 of US, and eastern half of Canada (see distribution map)
F. cinerea: all of US and southern Canada, plus Northwest Territories (see map)
F. modesta: across northern US and southern Canada, south in the west to California and Arizona (see map)
F. nivea: western US - mostly the southwest but one record from North Dakota (see map)
F. occidentalis: southern Yukon across southern Canada and northern US (see map)
F. scolopendrina: patchily distributed in northeastern states and 4 eastern provinces; widely distributed in western states and 3 western provinces; missing from middle of continent (see map)
deciduous and mixed woods and shrublands
adults fly from April to October in the south; May to August in the north
larvae feed on leaves of birch, cherry, poplar, willow
Life Cycle
two generations per year in the south; one in the north
Internet References
pinned adult images of the 5 species occurring in Canada (CBIF)
pinned adult image of the 6th species, F. nivea (Bruce Walsh, Moths of Southeastern Arizona)
distribution list of 5 species in eastern Canada (CBIF)
distribution list of 4 species in western Canada (CBIF)