They are twisted , brown to brownish - gray , have four wings .
Are 2 to 16 cm ( 0.79 to 6.30 in ) long and usually 1.5 cm ( 0.59 in ) wide .
They are twisted , brown to brownish - gray , have four wings and are 2 to 16 cm ( 0.79 to 6.30 in ) long and usually 1.5 cm ( 0.59 in ) wide .