Leptotarsus albistigma is a species of crane fly native to New Zealand. The species was first described as Macromastix albistigma by Frederick Wallace Edwards in 1923.
Edwards described the species as follows:
Leptotarsus albistigma is pale green in colour. The species' eggs are elliptical and 0.75mm in length. The larvae are between 16.5 mm and 20 mm in length, are moderately flattened and are a cinnamon-like light-brown colour.
In 1924, Charles Paul Alexander classified the species into a subgenus, Chlorotipula, which included exclusively species from New Zealand. Since this time, the subgenus Chlorotipula has been recategorised and placed within the genus Leptotarsus.
The species is endemic to New Zealand. It is commonly found in the South Island, on damp logs of exotic tree species, including rotting Pinus radiata and willow trees.
The larvae of Leptotarsus albistigma bores through wood that has been softened by fungi. Larvae of Austrolimnophila argus, another species of New Zealand crane-fly, have been found together with the larvae of this species.