LEPORIDZ—GEOGRAPHICAL VARIATION, Del 
from Alaska and the northwestern portions of British America. This 
instance, however, forms the only actual exception to the general law of 
decrease in size southward. In all the other species, those from the more 
southern localities are the smaller. Thus, Georgia specimens of Lepus 
sylvaticus are appreciably smaller than those from about Washington; speci- 
mens of variety Nu¢talli from Western Texas are smaller than those of the 
same variety from Deer Creek, Nebraska; specimens of L. californicus from 
Cape Saint Lucas are also considerably smaller than those from about San 
Francisco; and the same is true of specimens of L. Trowbridges from these 
two localities. 
TaBLe I.— Measurements of skulls of American specics and varietics of LEPUS, showing variation in size, with 
locality. 
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Average size of 5 specimens |3. 79) 1. 72/0. 82|1. 56,0. 830. 7€| 1.20 | 1.55 |0. 34) 0.33 | 0.62 | 0.51 2.591 41} Vicinity of San Fran 
of Lepus californicus. cisco, Cal. 
Average size of 10 specimens |, 52 1. 58\0. 72/1. 42/0. 70/0. 68) 1.09 | 1.32 |0.40) 0.34 | 0.59 | 0.47 |2.29)1.45|;C ape Saint Lucas, 
of Lepus californicus. Lower California. 
Average size of 14specimens |3. 07/1. 55/0. 63/1, 26/0. 65/0. 54) 0.96 | 1.25 0.34 0.27 | 0.58 | 0.47 '2.14/1. 45) Oxford County, 
of Lepns americanus. Maine. 
Average size of 6 specimens |3, 23/1. 60/0. 69)1. 31/0. 62/0. 63) 0.99 | 1.30 (0.35) 0.30 | 0.63 | 0.49 |2. 22)1.53) New York and Penn- 
of Lepus americanus. sylvania. 
Average size of 26 specimens 3. 04/1. 52.0. 67/1, 21/0, 6210.54) 0.92 | 1.24 10.33) 0.26 | 0.58 | 0.45 2.1 |1.58) Alaska and British 
of Lepus americanus. Possessions. 
Lepus sylvaticus var. syl- |2. 83)/L. 43)0. 74/1. 21/0. 61)0. 50/ 0.90 | 1.23 0,3:| 0.25 | 0.54 | 0,44 |1. 97/131) Washington, D.C, 
vaticus. 
BO) eases accaccerecodas 2. 81/1. 37/0. 74/1. 190, 57/0. 49) 0.91 | 1.22 0.34) 0.26 | 0.52 | 0. 42 |1.9.|L. 32) Saint Simon’s Island, 
Georgia. 
Avornge size of 4 specimens |2. 75/1. 40|0. 69/1. 1¢/0. 52/0. 50) 0,90 | 1.16 0.34] 0.25 | 0.50 | 0.37 1.81 /1.35) Deer Creek, Nebr. 
of Lepus sylvaticus var. 
Nuttalli. 
Average s'zo of 7 specimens |2. 56/1. 2°|0. 65/1. 07/0. 52/0, 45 0.81 | 1.10 0.26) 0.22 | 0.45 | 0.36 1.7-|L. 24) Vicinity of Browne: 
of Lepus sylvaticus var. ville, Tex. 
Nuttalli. 
Average size of 4 specimens [2. 50/1. 2=|9, 57/1. 110. 47,0. 42) 0.79 | 1.04 0.2¢] 0.21 | 0.47 | 0,35 1.7!/1. 12 Vicinity of San Fran- 
of Lepus Trowbridgei. cisco, Cal. 
LD ERGE RS eeRCCOSeE Ome 2. 20) 1. 17/0. 59.0. 94.0 43.0. 32) 0.70 | 0.89 0.24) 0.18 | 0.42 | 0.36 1.4¢|1.04 Cape Saint Lucas, 
Lower Culifornia. 
While in the Lepus sylvaticus group, variety sylvaticus shades imper- 
ceptibly into variety Nuéta/li in passing from the wooded region westward 
to the treeless plains, and while Iowa specimens of sylvadicus are the largest 
) A s 
