RODENTIA-HYSTRICIDAE-ERETHIZON EPIXANTHUS. 
571 
The following table will illustrate the peculiarities of the nasals above referred to : 
Current number. 
Species. 
Skull from occiput 
to end of inci¬ 
sors. 
Skull from occiput 
to end of nasals. 
Width of skull. 
Length of nasals 
together. 
Greatest width of 
nasals together. 
Locality. 
822 
1263 
1262 
2594 
2595 
931 
676 
2356 
3066 
JE qnmvthiia __ 
3. 83 
3. 57 
; 2.82 
1. 40 
. 90 
Upper Missouri_ 
3.70 
3.48 
2.55 
1. 40 
.76 
Bill Williams’ Fork_ 
3. 40 
3 15 
2.37 
1. 25 
. 68 
4.23 
3. 95 
2. 85 
1. 60 
. 80 
Republican Fork..._ 
4. 23 
4. 00 
2. 85 
1. 80 
. 96 
E. dorsalus -,- 
3. 58 
3. 35 
2 55 
1.08 
1. 20 
.65 
. 65 
St. Lawrence county, N. Y_ 
Pennsylvania_ 
3. 90 
3. 70 
2. 75 
1.30 
.76 
Essex county, N. Y_ 
4. 35 
3. 75 
2. 90 
1.21 
.78 
This species was first separated from the common American porcupine, by Brandt, in 1835. 
It appears well worthy of specific distinction. Brandt’s specimens came from California and 
Unalaschka. This will give a wide range to the species, as it probably replaces E. dorsalus 
everywhere, from the Upper Missouri, north and west. 
List of specimens. 
