Common Name: Silver-bordered fritillary
Scientific Name: Boloria selene
The eggs are shaped like elongated igloos and are green in color (Pyle 2002). Larvae are blackish with yellowish spines and black spines extending over the head (Allen et al. 2005). The chrysalis is tan and adorned with metallic silver spots and thornlike projections. Adults are 1 3/8 – 2 7/8 inches (35 – 47 mm) in length (Opler and Wright 1999). According to Pyle (2002), wings are bright orange above with black marks occurring in a sparse pattern. Below, the forewings are orange, and the chestnut-colored hindwings have four rows of metallic silver spots radiating out from the base to margin; black dots and tan patches occur between these spots. The central silver spot is elongated.
According to Pyle (2002), adults lay eggs on or near violets, usually marsh violet (Viola palustris) and bog violet (V. nephrophylla). Butterfly adults feed on nectar of various composites including mints and Verbena. Between early June to mid-August populations in the vicinity of Big Summit Prairie, Crook County and in central Grant County fly in a single annual brood (Warren 2005). Two annual broods are likely to occur in Baker Co. from mid- and late May. Pyle observed depredation by ambush bugs (Phymata) in 2002.
Range, Distribution, and Abundance:
This species of butterfly can be found throughout much of the Northern Hemisphere, south in the Appalachians, Midwest, Rockies, and Cascades. It is also not uncommon to find them in S.E. British Columbia. Boloria selene is known possibly from twenty sites in Washington in the Pend Oreille, Okanogan, Columbia and Yakima drainages (Pyle 2002). In Oregon, these butterflies have been found in Big Summit Prairie, Crook Co. the Strawberry Mountains, Grant Co., and in the Southern Wallow Range north of Halfway, and Baker Co. (Christensen 1981; Pyle 2002; Warren 2005). Occurrences of these butterflies have been documented in the Prineville District BLM and in the Malheur and Wallowa Whitman National forests.
Boloria selene can be found in bogs, open riparian areas, and in marshes containing a large amount of Salix and larval food plants (Warren 2005). Sunny wet habitats encourage adult flight.
Habitat succession and drying have put many populations under stress (Pyle 2002).
Habitats known to contain these butterflies should be managed to maintain hydrology, and the continued existence of violets by monitoring willow succession (Scheuering 2006). Vegetation treatments to reduce conifer encroachment may be needed at some sites. The use of pesticides which may negatively impact this butterfly or the northern bog violet should be avoided. Additional efforts to locate sites occupied by B. selene may also be helpful (Larsen et al. 1995).
Boloria selene is globally ranked G5 -- widespread, abundant and secure throughout its range (Oregon Natural Heritage Information Center 2007). In Oregon this species of butterfly is ranked S2 -- imperiled. Populations have recently been put under stress due to habitat drying and succession.
Photo of Bolaria selene
Preparer: Heather Andrews
Date Completed: 6/13/10
Reviewed and edited by Rob Huff, Conservation Planning Coordinator, FS/BLM and Robin Vora, Deschutes and Ochoco National Forests, September 2010.
ATTACHMENT 1: Photo of Bolaria selene (Photo by Jeff Pippen)
ATTACHMENT 2: Information Sources