It should be noted here that the White-Tailed Deer group, (_Odocoileus_), is very well represented in South America by _O. weigmanni_ of the Guianas. The Marsh Deer, (_Blastoceros paludosus_), of eastern South America, is the largest South American deer. Our first specimen was obtained in 1904. Its antlers are strongly built but short, and in architecture resemble the antlers of a Siamese species known as Schomburgk Deer, (_Cervus schomburgki_); but the latter has on each beam three double bifurcations, while the former has but two. The Marsh Deer has very large, wide-spreading hoofs, which it would seem have been developed by many generations of existence on soft ground. It inhabits the jungles along river banks, in Brazil. The head of this animal is of remarkable length. This important species is rather weak in captivity, and it is by no means certain that it can constantly be exhibited here. There is another South American species, (_Blastoceros campestris_), which is a zoological understudy, or miniature, of the large Marsh Deer. The Black-Faced Brocket, (_Mazama tema_), _whenever it can be obtained_, will represent a group of American deer which is as little known in the United States as if it inhabited the heart of Borneo. The Brockets are smaller than the Sinaloa white-tailed deer, and they are so nearly hornless that the antler is merely a small, straight, sharp-pointed spike of bone only three inches long. The adult animal is only 25 inches in shoulder height, which is about the size of the muntjac of India. Of the Brockets there are several species, mostly South American, but from skulls and horns received we now know that it is found as far north as the State of Puebla, Mexico. A correspondent in that locality is constantly endeavoring to secure specimens for us, and no doubt will shortly succeed. For the reason that we expect specimens in the near future, this species is included. The Hog Deer, (_Cervus porcinus_), which is very unlike a hog, and is libeled by its name, is a small species from India, which is provided with long and well-shaped antlers having a total of six points. Sometimes the adult males are spotted in summer, and sometimes they are not. This species stands next to the beautiful axis deer. It breeds well in captivity, but is a very nervous and even hysterical animal. The Molucca Deer, (_Cervus moluccensis_), is a thick-bodied, scantily-clad and coarse-haired understudy of the Malay sambar, (_Cervus unicolor_). Of all deer it is one of the least beautiful. Its hair resembles the bristles of a wild hog, and its color is a dull, raw-umber brown. It belongs to the sambar group of East Indian deer, and really marks, both geographically and in size, the farthest departure from the type species of the group.