AEVICANTHIS NILOTICUS. 
281 
narrow, hardly a hair’s breadth; the sphenoidal pits are very deep ; the auditory hullse 
are small and slightly compressed laterally; the lower jaw is very strong and deep. 
This animal was badly figured in the Atlas of ‘ Descr. d’Egypte ’ under the name of 
“ I’Echimys d’Egypte,” but was re-named “ I’Echimys du Nil ” in the text, which was 
not published till many years after, with the assistance of Audouin. The Lemmiis 
niloticiis of the Catalogue of the Paris Museum also refers to this animal. 
The specimens from Tukar agree with those obtained by Mr. Rothschild at Shendi 
and by Mr. Witherhy to the south of Khartum in being very pale in colour and 
in having a proportionately longer tail than those of the typical species. This race 
represents the A. testicularis, Sundevall (Vet.-x4k. Hand!. 1842, p. 221), which is also 
found in Arabia. 
In the damper regions of both the Blue and White Niles a dark form is again^ 
found, A. abyssiniciis, Eiipp.—W. E. db W.] 
