WATERBUCKS AND REEDBUCKS 
519 
species. No mention was made of the naked character of 
the pasterns, or the short, bulging snout and wide nasal 
bones so distinctive of the lechwi. Gray associated with 
the lechwi the poku or Zambesi kob, an antelope of the 
genus Adenota , while the Nile lechwi, which closely resembles 
the true lechwi in the horn characters used by Gray, was 
placed with the waterbucks. Later naturalists have not 
recognized Gray’s genera, but have lumped the lechwis and 
kobs with the waterbucks in the genus Kobus. Most recent 
writers have adopted the arrangement of the species as 
given by Sclater and Thomas in the “ Book of Antelopes,” 
where the Zambesi lechwi is placed at the end of the line 
and the Nile lechwi widely separated from it and associated 
with the waterbucks under the subgenus Cobus. 
The back of the pasterns and the border of the hoofs and 
the false hoofs are hairless, the skin being thickened and 
pad-like. The hoofs are long and slender. The tail is long, 
the tufted tip reaching the hocks. The horns are long, sub- 
lyrate in shape, and wide-spread. The snout is short and 
bulging. The lechwi shows important differences from the 
kobs and waterbucks in the short, wide nasal bones, the 
prominent swelling of the supraorbital region, and the great 
width of the basioccipital bone separating the tympanic 
bullae. There are but two species: the Zambesi lechwi and 
the Nile lechwi. 
The distribution is peculiar and discontinuous. The 
Zambesi lechwi ranges from Lake Ngami northward as far 
as Lake Mweru on the northern border of Rhodesia, while 
the Nile lechwi is confined to a very limited tract on the 
White Nile more than one thousand miles north of Lake 
Mweru. 
Nile Lechwi 
Onotragus megaceros 
Native Names: Dinka, abokk; Nuer, til. 
Adenota megaceros Fitzinger, 1855, Sitz. Ak., Wien, XVII, p. 247. 
Range.— Mouth of the Bahr el Ghazal at its junction 
with the White Nile. Apparently confined to the district 
near the mouth of the Bahr-el-Ghazal side and unknown 
