Wingspan: 2.5-3.5 cm. Adult males and females are similar, with subtle colouration differences on the uppersides of both sets of wings. Males are chocolate-brown except for an orange-brown ‘tail’, females are more reddish or orange-brown except for brown on the wing margins and the area near the tail. Undersides of wings of both sexes are brown with a thin, jagged white line, bordered with black, running across both sets of wings on the inside edge. The hindwing has a small “tail” with a few black dots and bluish and orange scales. Males have larger eyes than females, which may assist in detecting mates. Larvae are green or yellowish-olive with red, green, yellow, or white markings and lighter raised chevrons that somewhat resemble “scutes” (bony protrusions or scales), that run down the dorsal area. Larvae emit a sugary solution through a “honey gland” (dorsal nectary organ). Ants feed on the solution and protect the caterpillar from predators.Hibernating pupae are dark brown.
BC Conservation Data Centre. 2015. [Internet] Species Summary: Callophrys johnsoni. B.C. Minist. of Environment. - B.C. Conservation Data Centre. 2015. [Internet] [Updated March 31 2013]. Conservation Status Report: Callophrys johnsoni. B.C. MoE. - BC Ministry of Forests. 1995. [Internet] Dwarf Mistletoe Management Guidebook. - BC Ministry of Water, Land and Air Protection. 2004. [Internet] Accounts and Measures for Managing Identified Wildlife. Version 2004. Biodiversity Branch, Identified Wildlife Management Strategy, Victoria, BC. - Davis, Raymond et al. 2011. [Internet] Survey Protocol for Johnson’s Hairstreak Butterfly (Callophrys johnsoni) in Washington and Oregon (v1.2). Interagency Special Status/Sensitive Species Program (ISSSSP), Oregon/Washington Bureau of Land Management and Region 6 (R6,) Forest Service. - Davis, Raymond. 2010. Johnson’s Hairstreak Surveys in Oregon and Washington . Interagency Special Status/Sensitive Species Program (ISSSSP), Oregon/Washington Bureau of Land Management and Region 6 (R6,) Forest Service. - E-Fauna. 2010. [Internet] Electronic Atlas of the Wildlife of British Columbia. Callophrys johnsoni - Guppy, C.S., and J.H. Shepard. 2001. Butterflies of British Columbia. UBC Press in collaboration with Royal B.C. Mus. 414 pp. - Guppy, Crispin. 2010 & 2011. [Personal communication]. - Hall, P.W. 2009. [Internet] Sentinels on the Wing: The Status and Conservation of Butterflies in Canada. NatureServe Canada. Ottawa, Ontario 68 pp. - Kerr, J. T. 2001. [Internet] Butterfly species richness patterns in Canada: energy, heterogeneity, and the potential consequences of climate change. Conservation Ecology 5(1): 10. - Muir, John A.; Hennon, Paul E. 2007. [Internet] A synthesis of the literature on the biology, ecology, and management of western hemlock dwarf mistletoe. Gen.Tech. Rep. PNW-GTR-718. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 142 pp. - Nichol, Sarie, 2002. [Internet] Baker River Project Terrestrial Working Group Analysis Species. Johnson’s Hairstreak Butterfly (Loranthomitoura johnsoni). Unpublished Work, Puget Sound Energy, Inc. - Royal BC Museum. 2010. [Internet] Living Landscapes: Pend-d Oreille Butterfly Survey. - Xerces Society. 2015. [Internet] Factsheet Johnson’s Hairstreak Callophrys johnsoni