Length 1.4 to 2 mm. Prosoma yellowish, suffused with black. Opisthosoma dark with vague chevrons.

This species can only be confirmed by examination of the genitalia of mature specimens. 

In leaf litter and moss in damp areas. Occasionally in grassland, heaths.

Females are mature throughout the year, mature males are found only in late summer, autumn and winter.

Widespread but scattered in Britain.

Uncommon and local in Leicestershire and Rutland.

https://srs.britishspiders.org.uk/portal.php/p/Summary/s/Iberina+montana