''Orocrambus simplex'' is a

moth Moths are a paraphyletic group of insects that includes all members of the order Lepidoptera that are not butterflies, with moths making up the vast majority of the order. There are thought to be approximately 160,000 species of moth, many of w ...

in the family Crambidae. It was described by Arthur Gardiner Butler in 1877. It is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

New Zealand New Zealand ( mi, Aotearoa ) is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and over 700 smaller islands. It is the sixth-largest island count ...

, where it has been recorded in Westland,

Nelson Province Nelson Province was constituted in 1853 under the New Zealand Constitution Act 1852, and originally covered the entire upper South Island, including all of present-day Buller, Kaikoura, Marlborough, and Tasman districts, along with Nelson Ci ...

, the central part of the

North Island The North Island, also officially named Te Ika-a-Māui, is one of the two main islands of New Zealand, separated from the larger but much less populous South Island by the Cook Strait. The island's area is , making it the world's 14th-largest ...

and the coastal area of southern Hawkes Bay. The habitat where this species lives consists of

tussock grasslands Tussock grassland is a form of open grassland that is dominated by tussock grasses (also called bunchgrasses). It is common in some temperate grasslands, savannas, and shrublands ecoregions of the Southern Hemisphere. Tussock grasslands are usually ...

. The

wingspan The wingspan (or just span) of a bird or an airplane is the distance from one wingtip to the other wingtip. For example, the Boeing 777–200 has a wingspan of , and a wandering albatross (''Diomedea exulans'') caught in 1965 had a wingspan of ...

is 25–33 mm. Adults have been recorded on wing from November to February. Larvae have been reared from ''

Chionochloa rubra ''Chionochloa rubra'', known commonly as red tussock grass, is a species of tussock grass in the grass family, endemic to New Zealand. Description New Zealand has 22 endemic species of ''Chionochloa'', including ''Chionochloa rubra'', which ha ...

'', ''

Poa cita ''Poa cita'', commonly known as the silver tussock, or wī, which is also the Māori name, is a grass of the family Poaceae that is native to New Zealand. ''Poa cita'' was described and named by Elizabeth Edgar in 1986, having previously being nam ...

'' (formerly ''Poa caespitosa'') and '' Poa annua''.

References

Crambinae Moths of New Zealand Moths described in 1877 Endemic fauna of New Zealand Taxa named by Arthur Gardiner Butler Endemic moths of New Zealand {{Crambinae-stub