Putting the two observations together, it could make sense that no moths were seen in this week. Would be interesting to see if lights run again in March turned up adults.Two distinct flight seasons would be interesting - possibility of 2 broods/year? One snapshot of seasonal climate patterns in Misiones, (see lots of data here):
The graph here shows some seasonal variation in Misiones rainforest, but no distinct dry season; annual precipitation ~200 cm.