Oeconesus lobatus is a species of caddisfly belonging to the family Hydrobiosidae.

[1] The species was first described by Keith Arthur John Wise in 1958,[1] and is endemic to New Zealand.

[4] Wise's original text (the type description) reads as follows: Length of anterior wing, 13 mm (0.51 in).

Dorsal margin of ninth segment produced in two large rounded lobes with a slight transverse ridge across their bases.

Inferior appendages three-jointed, a stout basal joint with two terminal joints arising from its inner surface, one membranous and finger-shaped, the other more strongly chitinised, sharply excised ventrally towards the apex, directed inwards, and with a small tooth at apex.