Caste System:


In the Colonial Period a system of lineage or race identification was establisheed which divided the inhabitants of New Spain according to the color of their skin and mixture of races. At the top of this racial pyramid were the Spaniards born in Spain. The next level, on a lower step,were the white children of Spaniards, but born in the Americas called criollos. The third element consisted of the castes; i.e., the mixture of Indian, whites, blacks and their respective descendants. Although the caste system formed a racial hierarchy which coincided with economic and social ramifications, the caste system was not official and there was no legal prohibition against marriages between individuals of different levels.

Father             Mother            Offspring 
Spaniard           Indian            mestizo 
mestizo            Spaniard          castizo 
Spaniard           Negra             mulato 
Spaniard           mulata            morisco 
Spaniard           morisca           chino or albino 
Spaniard           albina            salta pa' atrás 
Indian             salta pa' atrás   lobo 
lobo               china             jíbaro 
lobo               india             zambaigo 
zambaigo           india             cambujo 
zambaigo           loba              calpamulato 
cambujo            mulata            albarazado 
calpamulato        cambuja           tente en el aire 
tente en el aire   mulata            no te entiendo 
barnocino          mulata            coyote 
no te entiendo     india             torna atrás 
albarazado         mestiza           barnocino 
indio              mestiza           coyote 
coyote             india             chamizo 
chamizo            mestiza           ahi te estás 
negro              india             jaracho 
indio              negra             zambo 
negro              zamba             zambro prieto 
blanco             mulata            tercerón or cuarterón cuatralvo 
Independence from Spain in 1821 did away with some of the classifications. President Benito Juárez abolished the entire caste system with the Constitution of 1857. I have seen in the early records:
Spaniard (español)
indio (Indian)
mestizo (child of Spanish father and Indian mother)
Negro
Lobo
Coyote (child of Indian father and mestiza mother)
By the mid 1800s probably only español, mestizo, and negro were still widely used.