The Booth's Sulphur or Pale Arctic Clouded Yellow (Colias tyche) is a butterfly

Butterfly

A butterfly is a mainly day-flying insect of the order Lepidoptera, which includes the butterflies and moths. Like other holometabolous insects, the butterfly's life cycle consists of four parts: egg, larva, pupa and adult. Most species are diurnal. Butterflies have large, often brightly coloured...

 in the Pieridae

Pieridae

The Pieridae are a large family of butterflies with about 76 genera containing approximately 1,100 species, mostly from tropical Africa and Asia. Most pierid butterflies are white, yellow or orange in coloration, often with black spots...

 family. It is found from Baffin Island

Baffin Island

Baffin Island in the Canadian territory of Nunavut is the largest island in the Canadian Arctic Archipelago, the largest island in Canada and the fifth largest island in the world. Its area is and its population is about 11,000...

 west along the Hudson Bay

Hudson Bay

Hudson Bay , sometimes called Hudson's Bay, is a large body of saltwater in northeastern Canada. It drains a very large area, about , that includes parts of Ontario, Quebec, Saskatchewan, Alberta, most of Manitoba, southeastern Nunavut, as well as parts of North Dakota, South Dakota, Minnesota,...

 and arctic coasts of the Nunavut and Northwest Territories mainland and the southern tier of Arctic Islands to northern Yukon

Yukon

Yukon is the westernmost and smallest of Canada's three federal territories. It was named after the Yukon River. The word Yukon means "Great River" in Gwich’in....

, Alaska

Alaska

Alaska is the largest state in the United States by area. It is situated in the northwest extremity of the North American continent, with Canada to the east, the Arctic Ocean to the north, and the Pacific Ocean to the west and south, with Russia further west across the Bering Strait...

, and Eurasia

Eurasia

Eurasia is a continent or supercontinent comprising the traditional continents of Europe and Asia ; covering about 52,990,000 km2 or about 10.6% of the Earth's surface located primarily in the eastern and northern hemispheres...

.
The wingspan

Wingspan

The wingspan of an airplane or a bird, is the distance from one wingtip to the other wingtip. For example, the Boeing 777 has a wingspan of about ; and a Wandering Albatross caught in 1965 had a wingspan of , the official record for a living bird.The term wingspan, more technically extent, is...

 is 28–43 mm.

The butterfly flies in June to August depending on the location.

The larvae feed on legume species.

Subspecies

• Colias tyche tyche (northern Eurasia)
• Colias tyche relicta (Chukot Peninsula, Far East)
• Colias tyche werdandi (northern Europe)
• Colias tyche magadanica (Magadan)
• Colias tyche flinti (Wrangel Island)
• Colias tyche olga (East Chukotka)
• Colias tyche boothii
• Colias tyche thula (Alaska and in Canada on Banks, Victoria and Melville Islands)

Both Colias tyche boothii (Booth's Sulphur) and Colias tyche thula (Thula Sulphur) are treated as valid species by some authors.

Similar species

• Hecla Sulphur
  Colias hecla
  The Northern Clouded Yellow or Hecla Sulphur is a butterfly in the Pieridae family. In Europe, it is found in the northern part of Norway, Sweden and Finland up to heights of 900 m. It is also found in Greenland, Alaska, the Northwest Territories, Yukon, Quebec, Labrador, Manitoba, the Chukot...
  
   (C. hecla)
• Labrador Sulphur
  Colias nastes
  The Labrador Sulphur is a butterfly in the Pieridae family. In Europe, it is found in the North of Norway and Sweden and on rare occasions in Northern Finland. It is also found in North America, specifically in Alaska, Canada, and the Rocky Mountains, Washington, Montana and on Greenland...
  
  (C. nastes)

External links

• Booth's Sulphur, Neactica.com
• Booth's Sulphur, Alaska, Butterflies and moths of North America