ve premolars" is easily duplicated in
_Lepus_ but in _Sylvilagus_ the control points are difficult to
find. Two other persons and I obtained three different
measurements, all different from Nelson's measurements, and we
thought that Nelson would have obtained different measurements by
measuring the same specimen of _Sylvilagus_ at different times.

"Depth of rostrum in front of premolars" seems to have been taken
perpendicular to the inferior longitudinal line of the rostrum,
approximately one-half millimeter anterior to the alveolus of the
anteriormost cheek tooth.

"Interorbital breadth" was taken across the supraorbital processes,
at the narrowest place, but _not_ from the notches medial to the
antorbital projections of the supraorbital processes.

"Parietal breadth" is the breadth, across the braincase, taken
approximately half way between the squamosal root of the zygoma and
the external auditory meatus, where there is a lateral bulge in the
squamosal bone. On each side of the skull, the calipers rest on the
squamosal bone, not on the parietal bone.

"Diameter of bullae" excludes the paroccipital process and was
taken from the anteriormost part of a tympanic bulla,
posterolaterally to the part of that same bulla, that is exposed at
the lateral side of the base of the paroccipital process.

_Specimens examined._--Total, four, all from Tamaulipas, Mexico, as
follows: 88 mi. S and 10 mi. W Matamoros, 3; 90 mi. S and 10 mi. W
Matamoros, 1.

_Transmitted February 20, 1951._

23-7414

End of the Project Gutenberg EBook of Mammals Obtained by Dr. Curt von Wedel
from the Barrier Beach of Tamaulipas, Mexico, by E. Raymond Hall

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