jaz Bulletin American Museum of Natural History. [Vol. XXXIV, 
feet. The species differ greatly in size, the largest being nearly twice the 
weight and bulk of the smallest, the extremes being the large red brockets 
of the Guianas and the small red brockets of Venezuela and Ecuador. 
On the basis of coloration the brockets form two groups, known respectively 
as red brockets and brown brockets. The forms of the red group vary in 
color from dark chestnut red to yellowish red, with the mid-dorsal region, 
head, and neck ranging from black or blackish to dark brown. The mem- 
bers of the brown brocket group vary from drab brown in Paraguay and 
southern Brazil to yellowish gray brown in Guiana, Venezuela, and north- 
ern Colombia. The little Mazama pandora of Yucatan is the only member 
of the brown group known from north of the Isthmus of Panama, and 
none appear to have been recorded from the Andean region north of Peru. 
On the other hand, the red brockets appear to be quite generally distributed 
from tropical Mexico south to Paraguay and Bolivia. 
NOMENCLATURE. 
During the early part of the nineteenth century all the brockets then 
known to systematists were referred to two species, a red one and a brown 
one, the former known as Cervus rufus, the latter as either Cervus semplici- 
cornis or Cervus nemorivagus, each being assigned a very wide range. ‘These 
names, as later applied, became ‘blanket’ names for, respectively, the red 
and the brown brocket groups. 
The existence in Mexico, Brazil, and the Guianas of small deer with 
antlers reduced to simple, short spikes, became known in a general way in 
the eighteenth century, through the writings of travellers and sojourners 
in these countries, and from occasional specimens that had reached Europe, 
but the information given by these early authors was too vague and too 
incomplete to afford a proper basis for nomenclature, and most of the 
systematic names based on these early accounts by compilers prove to be 
indeterminable. Azara, in his ‘Quadrupeds du Paraguay,’ published in 
1801, was the first author to whom we can turn for any intelligent descrip- 
tions of these small deer; he having described in great detail and with 
accuracy the two species which inhabit Paraguay, under the names, respec- 
tively, Gouazoupita and Gouazoubira. His attempt to identify with his 
species the corresponding animals of Mexico, Guiana, and Brazil mentioned 
by previous authors does not in the least detract from the value and useful- 
ness of his excellent descriptions of the Paraguay animals from actual speci- 
mens. These names fortunately became the sole basis of systematic names 
