The Mojave Sootywing, Mohave Sootywing, Great Basin Sootywing or Lena Sooty Wing (Hesperopsis libya) 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...

 of the Hesperiidae family. It is found from eastern Oregon

Oregon

Oregon is a state in the Pacific Northwest region of the United States. It is located on the Pacific coast, with Washington to the north, California to the south, Nevada on the southeast and Idaho to the east. The Columbia and Snake rivers delineate much of Oregon's northern and eastern...

 east to Montana

Montana

Montana is a state in the Western United States. The western third of Montana contains numerous mountain ranges. Smaller, "island ranges" are found in the central third of the state, for a total of 77 named ranges of the Rocky Mountains. This geographical fact is reflected in the state's name,...

 and south to southern California

California

California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...

, Arizona

Arizona

Arizona ; is a state located in the southwestern region of the United States. It is also part of the western United States and the mountain west. The capital and largest city is Phoenix...

, Baja California

Baja California

Baja California officially Estado Libre y Soberano de Baja California is one of the 31 states which, with the Federal District, comprise the 32 Federal Entities of Mexico. It is both the northernmost and westernmost state of Mexico. Before becoming a state in 1953, the area was known as the North...

, and north-western Mexico

Mexico

The United Mexican States , commonly known as Mexico , is a federal constitutional republic in North America. It is bordered on the north by the United States; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of...

.

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 22-32 mm. The upperside is dark brown with two rows of small white spots on the forewings. The underside of the hindwings is light to dark brown with a pale grey overlay and some white spots. Adults are on wing from July to August in one generation per year in North Dakota and Montana. In Colorado, there are two generations with adults on wing from June to August while adult are on wing from March to October in multiple generations in California. Adults feed on flower nectar.

The larvae feed on the leaves of Atriplex canescens

Atriplex canescens

Atriplex canescens, Chamiso, Chamiza, Four wing saltbush, Four-wing saltbush, and Fourwing saltbush, is a species of evergreen shrub in the Amaranthaceae family, which is native to the western and mid-western United States....

. They live in nests of leaves tied together with silk.

Subspecies

• Hesperopsis libya libya (Arizona)
• Hesperopsis libya lena (Edwards, 1882)
• Hesperopsis libya joaquina Emmel, Emmel & Mattoon, 1998 (California)