Baltimore checkerspot

Baltimore checkerspot
E. phaeton on Argyranthemum
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Lepidoptera
Family:	Nymphalidae
Genus:	Euphydryas
Species:	E. phaeton
Binomial name
Euphydryas phaeton (Drury, 1773)

The Baltimore checkerspot (Euphydryas phaeton) is a North American butterfly of the family Nymphalidae. It has been the official state insect of the U.S. State of Maryland since 1973.^[1]

During its period of growth, the checkerspot butterfly will search for a host plant for nourishment. Its native larval host is the white turtle head (Chelone glabra), but it has also to some extent made use of the introduced lawn weed English plantain (Plantago lanceolata)^[2] and other plants.^[3]

Unlike most butterflies and moths, which overwinter as eggs, pupae, or sometimes adults, the Baltimore checkerspot overwinters as larvae. In late summer (sometime in July through September depending on latitude, weather, and other factors) the larvae spin a pre-hibernation web on a plant, stop feeding, and remain in the web. Several months later they leave this web and enter the litter (dead grass and leaves and so on) on the ground, where they spend the winter.^[4]

• 

  Caterpillar

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  Adult, Ottawa, Ontario

References

1. "Maryland State Insect — Baltimore Checkerspot Butterfly". Maryland State Archives. 2004-06-17.
2. M. Deane Bowers, Nancy E. Stamp and Sharon K. Collinge (Apr 1992), "Early Stage of Host Range Expansion by a Specialist Herbivore, Euphydryas Phaeton (Nymphalidae)", Ecology, 73 (2): 526–536, doi:10.2307/1940758
3. Euphydryas phaeton (Drury, 1773), Butterflies and Moths of North America
4. M. Deane Bowers (1978), "Over-wintering behavior in Euphydryas phaeton (Nymphalidae)" (PDF), Journal of the Lepidopterists' Society, 32 (4): 282–288

External links

• Baltimore Checkerspot, photos and information on Jeff's Nature Pages
• Baltimore Checkerspot, Butterflies of Canada