Luz Serna, Baptism, 1884 Calvillo Ags. Difficult Traslation.

This is giving me difficulty reading the abuelos Maternos names.
Iglesia San Jose, Calvillo, Ags. May 18 1884
Baptism book 27 , page no. 103 entry no 417, image no. 116 of 127.

for Luz Serna
Maria Luz hija legitima de Marcelino Serna y Maria Lopez. Abuelos Paternos Narciso y Clara Ortiz. Abuelos Maternos ?????? y ?????? Duan. Thanks to anyone who can give me a reading or MATERNAL ancestry.