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


Family Psychidae - Bagworm Moths

Evergreen Bagworm Moth - Thyridopteryx ephemeraeformis Moth 3  Evergreen Bagworm Moth - Hodges#457 - Thyridopteryx ephemeraeformis Nigrita Bagworm Moth - Hodges #441 - Cryptothelea nigrita - male Thyridopteryx sp.? - Thyridopteryx ephemeraeformis - male Small moth - large antennae Kearfottia albifasciella Evergreen Bagworm Moth - Thyridopteryx ephemeraeformis - male
Show images of: caterpillars · adults · both
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Lepidoptera (Butterflies and Moths)
Superfamily Tineoidea (Tubeworm, Bagworm, and Clothes Moths)
Family Psychidae (Bagworm Moths)
Synonyms and other taxonomic changes
Siederia walshella is a new combination proposed by Peter Hättenschwiler (see notes on this page by Jean-François Landry). Landry places Dahlica and Siederia in subfamily Naryciinae.
26 species in 13 genera in North America listed at All-Leps
Male wingspan 12 - 36 mm
Adult females are either wingless or have only little vestigial stubs where wings should be. Males are usually black and unmarked.(1)

Larvae (bagworms) construct elaborate little cases around themselves of plant debris and other organic matter.

, ,
Larvae of some species eat lichen, whereas others prefer green leaves of a hostplant (usually a deciduous or coniferous tree).
Adults do not feed.
Life Cycle
Larvae (bagworms) construct spindle-shaped bags covered with pieces of twigs, leaves, etc., and remain in them -- enlarging the bags as they grow -- until they pupate (also in the bag). Adult females remain in the bag, emitting pheromones which attract adult males to mate with them.


Eggs are laid inside the bag, and when they hatch the larvae crawl away to begin construction of their own individual cases.

Some bagworm species are parthenogenetic; their eggs hatch without being fertilized.
Subfamily Naryciinae
2 genera in North America: Dahlica, Siederia
Subfamily Oiketicinae
2 genera in North America: Oiketicus, Thyridopteryx
, , , , , ,
Subfamily Psychinae
9 genera in North America: Apterona, Astala, Basicladus, Coloneura, Cryptothelea, Hyaloscotes, Prochalia, Psyche, Zamopsyche
, ,
Print References
Davis, D. R. 1964. Bagworm moths of the Western Hemisphere (Lepidoptera: Psychidae). USNM Bulletin 244: 1-233 (2)
Internet References
pinned adult images of 6 species by Jim Vargo, plus photos of related species/families (Moth Photographers Group)
overview of family (Wikipedia)
Works Cited
1.Field Guide to Moths of Eastern North America
Charles V. Covell, Jr. 2005.
2.Bagworm Moths of the Western Hemisphere
Donald R. Davis. 1964. Smithsonian Institution.