Pycnarmon syleptalis is a moth in the family Crambidae.

The forewings are ochreous, tinged with olive and irrorated (sprinkled) with olive-brown scales.

The antemedial line is dark and there is a point in the cell, as well as a prominent discoidal lunule.

The postmedial line is very strongly bent outwards between veins 2 and 5.

The termen is suffused with brown and there is a terminal series of black strigae.