RODENTIA—LEPORIDAE—LEPUS, 
575 
C. Skull more than twice as long as wide ; muzzle and nasal bones very long ; the former wider than 
high, anterior to the molars; post-orbital processes divergent; notin contact behind with the 
skull..... L. cuniculus. 
D. Skull about twice as long as wide; very convex and much arched behind. Muzzle rather wider than 
high, post-orbital processes moderate; united behind by anchylosis with the skull, (suture 
distinct,) and bounding a small narrow foramen anteriorly.. L. sylvalicus. 
bachmani. 
artemesia. 
E. Similar to preceding ; the post-orbital process not in contact with the cranium. L. trowbridgii. 
auduboni. 
F. Skull and incisors very large and massive ; muzzle about as wide as high. Post-orbital process completely 
fused with the skull for its entire length, leaving neither foramen, notch, nor suture.. L. aquations. 
palustris. 
Comparative measurements of skulls. 1 
Current number. 
Name of species. 
Skull. 
Distance between— 
Nasal bones, 
taken together. 
Length. 
Width. 
Extreme edges of 
orbital processes. 
Bottom of poste¬ 
rior supra-orbital 
notches. 
The last mentioned 
and end of nasal. 
Length. 
Width. 
Locality. 
1857 
L. timidus, L........ 
4.03 
1.97 
1.60 
.63 
2.50 
1.75 
.93 
Germany. 
1048 
£. variaiilis, var. borealis, Nilss. 
3.61 
1.81 
1.36 
.64 
2.07 
1.34 
.78 
Sweden. 
2277 
L. glacialis, Leach... 
3.65 
1.85 
1.34 
.65 
2.12 
1.48 
.80 
Newfoundland. 
1670 
L. americanus, Erxl. 
3.34 
1.61 
1.12 
.48 
2.01 
1.35 
.75 
New York. 
2158 
L. cuniculus, L. 
3.45 
1.62 
1.01 
.45 
2.04 
1.55 
.66 
Washington, D. C. 
3227 
L. cali/ornicus, Gray .. 
4.00 
1.75 
1.23 
.43 
2.35 
1.80 
.87 
San Francisco, California. 
1260 
L.callotisl Wagl. 
3.80 
1.75 
1.14 
.52 
2.17 
1.65 
.82 
Fort Conrad, New Mexico. 
1215 
L. r.allntijt, yar. fJ.rLnitmla.xis ? Wagn..... 
3 75 
1.75 
.52 
2.04 
1.53 
.85 
Western Texas. 
1352 
L. campestris, Bach. 
3.67 
1.76 
1.22 
.55 
2.25 
1.60 
Fort Kearney, Nebraska. 
1223 
L. uiashinglonii, Baird... 
2.93 
1.50 
.94 
.48 
1.67 
1.15 
.66 
Washington Territory. 
595 
L. cuniculus and sylvaticus, hybrid 0 . 
2.95 
1.45 
.90 
.50 
1.71 
1.20 
.50 
Carlisle, Pennsylvania. 
2093 
L. sylvaticus, Bach. 
2.95 
1.44 
.90 
.52 
1.80 
1.15 
.50 
Do. 
2094 
.do..... 
1.54 
1.05 
.48 
1.86 
1.33 
.65 
Fort Des Moines, Iowa. 
1232 
L. artemisia ... 
2.60 
1.35 
.93 
.43 
1.55 
1.10 
.55 
West of San Antonio, Texas. 
1193 
L. bachmani , Waterh... 
2.70 
1.34 
.95 
.43 
1.70 
1.15 
.50 
Brownsville, Texas. 
2041 
L. auduboni, Baird. 
2.66 
1.34 
.90 
.48 
1.57 
1.10 
.55 
San Francisco, California. 
1871 
L. trowbridgii, Baird...... 
2.52 
1.25 
.70 
.44 
1.50 
1.12 
.44 
Do. 
2089 
i. palustris, Bach.. T .. 
3.20 
1.50 
1.04 
1.98 
1.20 
.46 
Society Hill, South Carolina. 
1228 
L. aquaticus, Bach. 
3.55 
1.63 
1.10 
2.17 
1.48 
.65 
Calcasieu, Louisiana. 
1 The measurement of length is taken with dividers, from the transverse occipital crest to the anterior face of upper incisors in most cases; to the 
end of the nasals, the distance is somewhat less in some, though not in all. 
‘ This skull belonged to a hybrid of the second generation, between L. cuniculus and sylvaticus, and exhibits in a marked degree the cranial pecu¬ 
liarities of both species. Thus, we have the rather short muzzle and nasal bones, with the rounded and arched cranium proper of the latter, and the 
divergent and free post-orbital processes of the former. 
