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Checkered White			Pontia protodice (Boisduval and LeConte), 1829
				Habitat: Disturbed open areas
				Larval food: Cruciferae, incl. Lepidium, Capsella, Barbarea
				Adult flight: Two, sometimes three broods, May, July, September
				References: Royer 39, Opler & Krizek 56, Scott 182
				Confirmed occurrences: Not recorded in the Sheyenne National Grassland
				in 1995, but probable in any year, especially in disturbed areas near 
				crucifers.

Mustard White			Artogeia napi oleracea (Harris), 1829
				Habitat: Shady deciduous woods
				Larval food: Cruciferae, incl. Dentaria, Arabis, Nasturtium, Brassica
				Adult flight: Two broods, June, August
				References: Royer 177, Opler & Krizek 57, Scott 217
				Confirmed occurrences: 1st Ransom County Record (2nd ND state record), 
				south of Mirror Pool, S1 T135N R53W on 6 Jul 1995. Should be expected in 
				the RNA exclosure woodland in S2 T135N R53W, or in other areas of 
				perpetually shady river bottom woodland, especially where Tilia is evident 
				in late June/July and again in late July/August.

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 in 1995 throughout the grassland from 
				June onward.

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 in 1995 throughout the grassland from 
				June onward.

Orange Sulphur			Colias eurytheme (Boisduval), 1852
				Habitat: Common in agricultural areas, though less so than philodice
				Larval food: Legumes, esp. Medicago, also Melilotus
				Adult flight: Multiple broods, May-September
				References: Royer 42, Opler & Krizek 65, Scott 196
				Confirmed occurrences: Uncommon in 1995, but present throughout 
				the grassland in late July and August.