35.075 Monochroa arundinetella (Stainton, 1858)

Status and Distribution

Rare, with few recent records. Restricted to south and east England south of a line from the Wash to the Severn. A historic record from Cornwall is considered to require confirmation.

A specimen from Wiltshire in 2019, with a 14mm wingspan and strongly marked forewings, was recently identified by European experts Keld Gregersen and Ole Karsholt. The Moths and Butterflies of Great Britain and Ireland Vol. 4 (2) note that British specimens have a wingspan in the range 9-10mm (although up to 12mm has been noted in Europe).

National Status: 

pRDB 1

Bradley & Fletcher no: 

Photographer: ©L Evans
Location: Wiltshire

Provisional Map

Maps updated with all data received by January 2022.



Set Specimens

Monochroa arundinetella Wiltshire 2004 coll. J. Langmaid (Photo: S. Palmer)

Dissection Group

Foodplant and Larval Feeding Signs

Carex riparia (greater pond-sedge), see plant distribution map, and to a lesser extent Carex acutiformis (lesser pond-sedge).

Mines the leaves in a long slender whitish or pale brown gallery both upwards and downwards and will change leaves.

Foodplant Map


Reed-swamps, riverbanks, edges of pools and lakes, fens, marshes and ditches.

Finding the Moth

Larva: mines can be found in March but become progressively more difficult to locate into April.

Adult: flies at dusk and during the night, occasionally coming to light.

Similar Species

One of the smallest of the Monochroa group with four pale spots along the costal cilia. Dissection is recommended for all but the most pristine of specimens.

Larval Occurrence

Larval Occurrence

Flight Period

Flight Period

Flight period given as June and July but there are very few full dates on the Scheme database.

Earliest: 26th June 2014 (VC25)

Latest: 9th August 1869 (VC28)