d into two groups (each group possibly amounting to something
more than a species and something less than a subgenus) on the basis of
a white rump and complex infolding of the enamel layer of the front of
the first upper incisor _versus_ a dark rump and simple infolding of the
mentioned layer of enamel. He placed _Lepus californicus merriami_
Mearns, among other subspecies, in a group different from the one in
which he placed several other subspecies of _Lepus californicus_.

Specimens (skulls with accompanying skins) of the species _Lepus
californicus_ in the Biological Surveys Collection of the United States
National Museum, representative of a gradual transition from the dark
rump and simple fold in the enamel to the white rump and complex fold in
the enamel are as follows: _L. c. deserticola_, No. 29733/41808,
Paharanagat Valley, Nevada; Nos. 117463 and 156744, Beals Spring,
Arizona. _L. c. texianus_, No. 24635/32031, Springerville, Arizona; No.
97453, Roswell, New Mexico; No. 118751, Toyah, Texas; No. 118749,
Valentine, Texas; and No. 108700, Terlingua Creek, Texas. In the
continuously distributed species _Lepus californicus_, along the
northwest to southeast line provided by the localities of occurrence
listed immediately above, there is a gradual transition from one kind of
fold to the other kind and from one color of rump to the other color.
It is clear that Shamel (_op. cit._) was in error in his conclusions;
the kinds of black-tailed jack rabbits to which Shamel (_op. cit._)
applied the name _Macrotolagus_ should stand as given below.

Correct names:

_Lepus alleni alleni_ Mearns
_Lepus alleni palitans_ Bangs
_Lepus alleni tiburonensis_ Townsend
_Lepus gaillardi gaillardi_ Mearns
_Lepus gaillardi battyi_ J.A. Allen
_Lepus callotis_ Wagler
_Lepus flavigularis_ Wagner
_Lepus californicus altamirae_ Nelson
_Lepus californicus melanotis_ Mearns
_Lepus californicus merriami_ Mearns
_Lepus californicus asellus_ Miller
_Lepus californicus festinus_ Nelson
_Lepus californicus texianus_ Waterhouse

MEASUREMENTS (IN MILLIMETERS) OF ADULTS OF TWO SUBSPECIES OF LEPUS
CALIFORNICUS

Key:
A Total length G Breadth of rostrum above premolars
B Tail-vertebrae H Depth of rostrum in front of premolars
C Hind foot I Interorbital breadth
D Ear from notch in dried skin J Parietal breadth
E Basilar length K Diameter of bulla
F