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Western White			Pontia occidentalis (Reakirt), 1866
				Habitat: Open prairie, especially on hilltops
				Larval food: Cruciferae, incl. Lepidium, Arabis, Sisymbrium
				Adult flight: Two broods, May, July
				References: Royer 39, Ferris & Brown 150, Scott 222
				Confirmed occurrences: 9 Aug 1995 in NE 1/4 S6 T158N R76W.

European Cabbage Butterfly	Artogeia rapae (Linnaeus), 1758
				Habitat: Ubiquitous in gardens and roadsides in 
				agricultural areas 
				Larval food: Cruciferae, occasionally also Capparidaceae
				Adult flight: Multiple broods, May-September
				References: Royer 40, Opler & Krizek 59, Scott 216
				Confirmed occurrences: Common all 1995 season throughout 
				refuge; much reduced but still fairly common fall 1996 on 
				both transects.

Olympia Marble			Euchloe olympia (W. H. Edwards), 1871
				Habitat: Prairies and sage flats
				Larval food: Cruciferae, incl. Arabis, possibly also 
				Sisymbrium
				Adult flight: One brood, May
				References: Royer 41, Opler & Krizek 157, Scott 215
				Confirmed occurrences: 30 May 1995 in S12 T158N R76W.

Clouded Sulphur			Colias philodice (Godart), 1819
				Habitat: Ubiquitous in agricultural areas
				Larval food: Legumes, esp. Trifolium spp., Medicago and 
				Melilotus
				Adult flight: Multiple broods, May-September
				References: Royer 42, Opler & Krizek 64, Scott 198
				Confirmed occurrences:  Common all 1995 season throughout 
				refuge, peaking twice, in early June and again in late 
				July; again fairly common throughout 1996 season on both 
				transects.

Orange Sulphur			Colias eurytheme (Boisduval), 1852
				Habitat: Common in agricultural areas, though less so 
				than C. philodice
				Larval food: Legumes, esp. Medicago, also Melilotus
				Adult flight: Multiple broods, May-September
				References: Royer 42, Opler & Krizek 65, Scott 196
				Confirmed occurrences: 9 Aug 1995 in  NE 1/4 S6 T158N 
				R76W; generally uncommon.