Size: Up to 1.5 inch wingspan
Key ID features: Above, FW gray-brown with indistinct gray markings and 3-5 tiny hyaline (glassy, translucent) spots on FW. Female FW usually more boldly patterned, but less so than Propertius. HW gray-brown with vague light spots. Below dark brown with light spots and hyaline spots on FW, small vague spots on HW.
Similar species: Propertius is larger, and usually more strongly marked. When fresh, Pacuvius has brown patches on FW, otherwise look for tibial tufts on hindlegs (Persius has them, Pacuvius does not).
Host plant: Pea family species, including lupines (Lupinus), Thermopsis, Astragalus, and Lotus.
Habitat: Open sunny meadows, roadsides and hillsides.
Range: Cascade Range, Willamette Valley, much of Coast Range, Ochoco Mtns, Blue Mtns, Wallowa Mtns, Siskiyou Mtns, Klamath Mtns.
Season: Mid-April to mid-August
Conservation Status: Secure