Characters;"S. colubra sp. n.";"S. insolens";"S. sineocula" "Mac in Gr. II on dorsal head";3(4);"usually 4‒5(6‒8)";"usually 5‒6(4)" "Labial chaeta M1s";absent;present;absent "Postlabial chaetae X and X2‒4";"smooth, minute";"cliate, large";"ciliate, large" "Mac m5i on Th. III";absent;present;absent "Mac on Abd. I";6+6;7(6)+7(6);7(6)+7(6) "Central mac on Abd. II";3+3;4+4;3+3 "Lateral mac on Abd. IV";4(5)+4(5);6+6;6+6