Final answer:
The four myths of ethnicity as described indirectly in the provided text center on the glorification of national history, the social impact of racial categorization, the ubiquitous influence of ethnocentrism, and the critique of the "Melting Pot" mentality.
Step-by-step explanation:
The four myths presented in Lemarchand's "Ethnicity as Myth" are not explicitly detailed in the provided text, and thus we cannot state them directly. However, based on the surrounding content and discussions of myths within the scope of ethnicity, race, and nationalism, we can deduce certain themes. T
he provided texts suggest myths related to the glorification of national history, racial categories holding social significance despite lacking biological basis, ethnocentrism as a common cultural consequence, and the problematic nature of the "Melting Pot" mentality in America. These myths support the notion of ethnicity as a socially constructed concept that relies on collective belief systems rather than objective truths.