24 hours and five Cephalotes species! Incredible. Working on identifying them -- one may be C. persimilis, which is fairly common in the cerrado (it seems smaller than I remember, though); and one is C. atratus, which is pretty much everywhere. The other three are definitely new, and awesome! My money is currently on C. spinosus, C. simillimus, and C. cordatus; but I'll need some more time at the scope to be sure.
Also, in the past 24 hours I swam in an oxbow lake (in the Amazon!), played futeball for the first time since I was, like, ten (ten-year-old me would probably have been more of an asset to my team), and saw a giant armadillo.