caputztic. cosa negra. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 12v. col. 1. Thanks to Joe Campbell for providing the transcription.
Frances Karttunen:
CAPOTZTIC something black / cosa negra (M), negro, prieto, tringueño, moreno (T) See CAPOLTIC. Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 25.