Another group is Pronolagus, typified by the Cape thick-tailed hare, the so-called Lepus crassicaudatus, which is externally similar to Lepus proper, but has the skull and teeth of the general type of the next group. The tailless rabbit of Mount Popocatepetl, Mexico, originally described as a distinct generic type, under the name of Romerolagus nelsoni, is broadly distinguished by the entire absence of the tail, and the short ears and hind-feet, its general form being like that of the Liu-Kiu rabbit, while, as in the latter, the post-orbital process of the skull is small, and represented only by the hinder half.
Tazetta. The type hybrids are N. incomparabilis, Bernardi (both found wild), Nelsoni, Barrii, Burbidgei, Humei, Leedsii, Milneri, tridymus, and odorus.
More starry, but with smaller cups, are Nelson's hybrids; tall, free, and distinct habit; the best, Nelsoni major, minor, pulchellus (perfect shape), Mrs C.J.