80 Miscellaneous. 
nearly all parts of the body the fur is bicoloured, dusky at its roots 
for two-thirds of its length; on the upper parts the dusky colour 
becomes almost black, and on the under much paler. From the 
chin to the space between the fore legs is an elongated patch of fur 
which is pure white from root to tip, just as in Hesperomys atro- 
gularis. The tail is deep dusky above, paler below; claws white. 
In the outline of the grinding-surfaces of the molar teeth, this 
species differs from all others at present described. Without en- 
tering into a minute description of these teeth, of which it is difficult 
to give a clear idea without figures, it may be stated that they have 
somewhat the same arrangement of cusps as those of NV. cinerea of 
Baird, saving that in the present species the anterior cusp or prism 
of the first tooth in the lower jaw is in a position decidedly outside 
the line of the cusps of the other teeth. The exposed ends of what 
I have termed the prisms of these teeth constitute their grinding- 
surface, which, instead of having an angular outline as in NV. cinerea, 
present, as in those of N. floridana, a series of transverse, ovoid or 
loop-like figures; but these loops in the present species are much 
natrower in an antero-postericr direction than in any other species, 
owing to the folds of enamel entering more deeply and broadly into 
the sides of the tooth. 
Length of the head and body ............ 6 6 
of the head ..... Ui 2 chee aa 
aivche cheat, ciclo e3 k ine 0 8 
prahe fore-arn e205. Ost. BAS Es 
—— of the fore foot and claws...... 0 8 
idem fiitoia ek REL) EO OAs 0M ee 
of the tarsus and toes 5 
Brass, hea AN ee ee 6 0 
iBreadthioratherears: 304.004 el Ce ae 0 8 
-of the hind feet at the root of the 
inner toe. 0.3 
Length of the skull from the front of the wiasal 
bone to the occipitalicrest ...-i/).'./.22 40; 1 8 
Breadth across the zygomatic arch ........ 0 11 
Keneth ‘of the nasal bones®, sb0.4 4 460) 22. 0 8 
from the point of the upper incisor to 
the crown of the first molar .......... 0 6 
of the molar series. . . Sarath 02 AS 
Length of the incisive foramina .......... 0 4 
———- of the palate .. i% 0 4 
Breadth of palate between two front molars.. 0 13 
-- of palate between two posterior molars 0 2 
Length of lower jaw from point of incisors to 
eondyle .\. |, J7eL ee eal. ee Lp 
- Depth from coronoid process to the angle. . 0 6 
Proc. Zool. Soe. pus 25, 1861. 
