A large group of these bats comes to feed on figs from a native tree (Ficus eximia) planted on the sidewalk in my neighborhood every time it has ripe fruits (one/twice a year). This time they came for over five consecutive days, every nigh for many hours, and I estimated they were about 30 individuals. Bat specialists who saw the pictures agreed that most probably they are this species of Artibeus, quite common in the region.
Grupo familiar encontrado bajo una hoja modificada de ciclantaceae
Blue-crowned is the expected species here but Collared is not out of the question.