Pycnarmon syleptalis is a moth in the family Crambidae. It was described by George Hampson in 1899. It is found in Loja Province, Ecuador.[1]
The wingspan is about 40 mm. The forewings are ochreous, tinged with olive and irrorated (sprinkled) with olive-brown scales. The costal area and terminal area are suffused with brown. The antemedial line is dark and there is a point in the cell, as well as a prominent discoidal lunule. The postmedial line is marked by points and there is a terminal series of black points. The hindwings are whitish, with a black discoidal point. 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.[2]