HYSTRICIDA3A—ERETHIZON DORSATUS VAR. EPIXANTHUS. 395 
TABLE II.—Measurements of eighteen skulls of EREYHIZON DORSATUS var. EPIXANTHUS. 
° So i=} 
oe reste ||) |lseecsi)| bs 
a Aa) 5/48 as|'s 
3 alee lgal4 
5 aT a e ol et ae ee} 
le ae lh eaa Se Seiise ef Sule fede | as 
4 B ° Sg 3 os 1a & 5) = = 
o A =} ro) 8 = = Ala oo ED 
g a Locality. * | E ro] - eB |e 2 to | os a 3 Remarks. 
E g 4 s 2 ao os a |o S| 8 a a 
A 5 2 7s S ) 2 o |.2 io S| Si e - 
2 | 5 Oe siege sel erates a si oe ole 
Blips Salers eal oS Neeeer einai ene | reba 
q = a= 3 = = = 2 5 
5 lo) x 6 A A A A |p p p A H 
6528 | 281 | Fort Yukon. . 3.85 | 2.80 | 1.28 | 1.38 | 0.80 | 0.92 | 1.27 | 1.97 | 1.02 | 3.10 | 1.50] Very old. 
6105 |...--- 4.03 | 2.85 | 1 1.37 | 2.00 | 0.93 | 3.18 | 1.50 |....do. 
CHU es Ce eee 4.08 | 2.81} 1 1.30 | 2.20 | 1.05 | 3.14 | 1.45 |....do. 
6108 |.-..- 3.92 | 2.77 | 1 32 | 2.10 | 1.03 | 3.12 | 1.40 | Middle-aged. 
GLOGi |e ceemi| scias 3.67 | <-0--- 1 1.20 | 1.90 | 1.03 | 2.85 | 1.30 |....do. 
8948 | 1313 | Alaska. ........ Bees oasO) |e aa ol. 1.06 | 1.62 | 0.92 | 2.55 | 1.20 |....do. 
6237 56 | Peel’s River --.| o& | 3.70 | 2.87] 1. 1 0. 0. 1.30 | 2.08 | 1.00 | 2.90 | 1.35 |.. ..do. 
1. 1 0. 0. 1.20 | 1.85 | 0.95 | 2.80 | 1.37 |....do. 
1,30 | 1.45 | 0.90 | 0.95 | 1.37 | 2.18 | 1,02 | 2.80 | 1.40 |....do. 
Miso) |) 15°75))| (0287) 45.022) 45 48)1 2:52). 1590) |= 25-oos=.. Very old. 
1,20 | 1.50 | 0.80 | 0.95 | 1.42 | 2.27 | 1.10 | 3.00 | 1.50 |....do. 
Bele cess) loses 1.03 | 1.25 | 0.62 | 0.78 | 1.25 | 1.90 | 0.97 | 2.85 |.-.... Middle-aged. 
co | 4.20 | 2.80 | 1.23 | 1.75 | 0.70 | 0.95 | 1.45 | 2.23 | 1.10 | 3.10 | 1.50 | Very old. 
Kans. 
1.30 | 1.60 Gil eee 1.25 | 2.12 | 1.05 | 2.90 | 1.55 |....do. 
1.18 | 1.60 ro) 85 | 1.35 | 2.25 { 1.10 | 3.15 | 1.53 |....do. 
AS977 |... --. Three Buttes, | 9 | 4.20 | 2.80 | 1.10 | 1.65 | 0.67 | 0.87 | 1.40 | 2.20 | 1.03 | 3.10 | 1.40 |... do. 
Mont. 
ASOTB) | oacntl eto GO) s-eaeceserul | Mea EEEI Eee ce 1.20 | 1.60 | 0.75 | 0.93 | 1.33 | 2.15 | 1.05 | 2.87 | 1.55 |....do.t 
6501 |..-... Fort Whipple, |.--.| 3.35 | 2.57 | 1.00 | 1.20 | 0.63 | 0.73 | 1.10 | 1.77 | 0.95 | 2.50 | 1.17 | Middle-aged. 
Ariz. 
* From front edge of intermaxillaries to occipital condyles. t The oldest of the series. 
