It’s been pretty obvious for many years that tapeti (Sylvilagus brasilensis) was a species complex. A new paper by Ruedas et al. suggests that the form originally described as S. brasilensis (from Pernambuco) is extinct, the Andean forms should be called S. andinus, and the lowland ones S. tapetillus. The authors think that a thorough review will produce further splits. I have a PDF if anybody wants it. BTW, their data strongly points at Allegheny and New England cottontails being conspecific.