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; not in contact behind with the 
- SKIL) « o'00n 0.010 0.00 0000010 celalbinelsislahjele 0 s(e/sle\se|sle cipiacsic o(s'ewis vessisiecwevensccccivesecccescccscace Lx 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 
distinet,) and bounding a small narrow foramen anteriorly........eeeseeeseeeecseccecessceees L, sylvalicus. 
bachmani. 
artemesia. 
kK. Similar to preceding ; the post-orbital process not in contact with the craniuM.....sssseeeeeeeeeees L. trowbridgii. 
auduboni. 
F, Skull and incisors very large and massive ; muzzle about as wideas high. Post-orbital process completely 
fused with the skull for its entire length, leaving neither foramen, notch, nor suture.........++++ L. aquaticus. 
palustris. 
Comparative measurements of skulls. 
Skull. Distance between— Nasal bones, | 
taken together. | 
oe tae eee eee 
5 Name of species. aie | er | Locality. 
= 85 |=26 aa ’ 
5 +] 8 iI FS 5 ‘S 
= Seales \aiee | ee 
2 Sve tbeay vais Sli Sips s8 leh Se (lyeed: al 
= i S fm 1390) 26 5 Ley il 
5 A =e [P| pata ier 4 | 
1857 L, timidus, Liesescssccccccccscccecesees | 4,03 1,97 1.60 63 2.50 1,75 -93 | Germany. 
1048 L. variahilis, var. borealis, Nilss.........| 3,61 1,81 1.36 64 2.07 1.34 .78 | Sweden. 
2277 L. glacialis, Leach. . se | 3.65 1.85 1.34 65 P30 1,48 -80 | Newfoundland, 
1670 L. americanus, Erxl.s, sessesesesecsees | 3,34 1.61 1.12 +48 2.01 1,35 -75 | New York. 
2158 E. cuniculus, Li sisvecescesccssccessceces| 340 1.62 1.01 45 2.04 1.55 -66 | Washington, D. C. 
3227 | L. californicus, Gray sere} 4,00 1.75 1.23 43 2.35 1,80 -87 | San Francisco, California. , 
1260 ZL. callotis? Wagl...cccccssesecscessees| 3.80 1.75 1.14 52 2.17 1.65 82 | Fort Conrad, New Mexico. 
1215 | L. callotis, var. flavigularis? Wagn.....| 3.75 1.75 |ecenvcee| 02 2.04 1,53 -85 | Western Texas. 
1352 L. campestris, Bach..cccccccseseeceevee| 3.07 1.76 1,22 -55 2.25 1.60 83 Fort Kearney, Nebraska. 
1223 | L. washingtonii, Baird......ececeeeesees| 2.93 1.50 94 48 1.67 1.15 66 | Washington Territory. 
595 L. cuniculus and sylvaticus, hybrid®..... 2.95 1.45 -90 50 1.71 1.20 -50 | Carlisle, Pennsylvania. 
2093 | L. sylvaticus, Bach....... 00-005 eee 2.95 1.44 -90 52 1.80 1.15 50 Do. 
2094 ee weceeeeecceses |osetenee 1.54 1,05 48 1.86 1,33 .65 | Fort Des Moines, Iowa, 
1232 | L. -| 2.60 1.35 +93 43 1.55 1,10 -55 | West of San Antonio, Texas, 
1193 | L. bachmani, Waterh...... 2.7 1,34 +95 43 1.70 1.15 -50 | Brownsville, Texas. 
2041 L. auduboni, Baird......c.ssseccceeceee| 2.66 1,34 90 -48 1.57 1.10 .55 | San Francisco, California. 
1871 L. trowbridgii, Baird........seeeeeeeeeee | 2.52 1,25 +70 44 1.50 1.12 44 Do. 
2089 L. palustris, Bach........0..0-- 3.20 1.50 Ue | paga sce, 1.98 1.20 .46 | Society Hill, South Carolina. 
1228 | L. aquaticus, Bach......... . 3.55 1.63 USUI Sse | be lvl 1.48 -65 | Caleasieu, Louisiana. 
1 
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. 
