LEPORIDA—LEPUS TROWBRIDGEL. 345 
The variations in size in Lepus trowbridgei are well indicated in the 
subjoined tables of measurements of the skulls and external dimensions. The 
extremes in a series of ten skulls are: length, 2.28 and 2.55; width, 1.15 and 
1.32; nasal bones (length), 0.90 and 1.17; lower jaw (length), 1.42 and 1.73. 
The length of the ear varies in different specimens from 2.28 to 3.05, the 
average being about 2.50 to 2.75. In specimens from the most southern 
localities, the ear averages considerably longer than in those from the north- 
ward, although the size of the animal, as indicated by measurements of the 
skull, is smaller at the southward. Thus the average length of four skulls 
from localities near San Francisco is 2.50 and the breadth 1.28; while the 
average length of the skull in four specimens from Cape Saint Lucas is 2.29, 
and of the breadth 1.17. 
The habitat of Lepus trowbridgei, as indicated by the specimens in the 
present collection, seems to be restricted to the region east of the Cascade 
range of mountains, and to extend along the coast from Fort Crook to Cape 
Saint Lucas. 
Lepus trowbridgei was first described by Professor Baird in 1855, and 
redescribed by him under the same name in 1857, by which appellation it 
has fortunately been always known. Very few original references have been 
made to the species aside from those in the various reports of the Pacific 
Railroad surveys and explorations. ; 
TaBLE XLII.— Measurements of L. TROWBRIDGEI. 
BK 
4 From tip of nose to— | Tail to end Length of— 
zl of— i$ 
S Bocnlite, =| ame eas oon] é Remarks. 
z, Locality. 2 3 3 s 
cl K 2 he 5 =| = z 2 = 2 
5 aja /a/S| &|/F lal é lal es 
310 | San Francisco or Monterey, Cal|..__| 1. 42 | 2.58 | 2.66 | 13.00 | 0.42 | 1.26 | 1.40 | 2.66 | 2.35 | From Baird. 
Sill|-- =. - isa see a s.r eke - | 1.25 | 2.42] 2.50] 1217] 0.50] .....| .... 2.75 | 2.35 | ...do. 
312 |-..... (0) 5 aay ene Soe 1.08 | 2.08 | 2.25 11. 00 | 0.42 | 0.84 |.-...- 2. 08 | -.do. 
1171 | San Francisco, Cal ........--- 15 40)'):2; 40" |) 2°80!) 19850) |-=---:})..-... 1,35 | 2.75 | 2 From a skin. 
phe 5} aes GOs joa cs a oocaecara ae 1.45 | 2.75 | %. 85 | 13. 25 | 1.00 1.80 | 1.45 | 2.75 | 2.55 | Fromaspecimenin 
| | | alcohol. 
ASGG:|.-2-:- GOs wsedacecccencecces cae 1.42 ..do. 
5a s80H seen TD) ScRoe bens sSseBeSteGneor Baer (Pb) 
669) Bodega, Cal:...............-- hae is oy From a skin. 
1183 | Santa Clara, Cal Ae |e Boe -.do. 
7A); botaluma; Cali cs-. 5. c2ccec. 32 .- 146 ..do. 
OID |e == 0D secepensesaeeneae a WAAL do. 
1590 | San Diego, Cal fs on Eee - do. 
1599) 5-- 5 =. Gt ageeere 9 | 1.35 . do. 
1503) 2. 2-2 doposeisacccsscses fay age ..do 
'3636 | Fort Tejon, Cal .........-..-- | Jo 11.25 - do. 
= —— 
* Specimens from Museum of Comparative Zodlogy, Cambridge, Mass. 
