TYPES OF _Geophis aquilonaris_
NEW SPECIES.

====+======+========+======+========+==========+==========+==========+======
| | Sex |Dorsal|Ventrals|Subcaudals|Pale rings|Snout-vent|Length
| | |scale | | +----+-----+ length | of
| | |rows | | |Body|Tail | | tail
----+------+--------+------+--------+----------+----+-----+----------+------
UMMZ|111501|[Female]| 15 | 173 | 55 | 29 | 12 | 237 | 60
UMMZ|111502|[Female]| 15 | 181 | 58 | 34 | 14 | 355 | 88
UMMZ|117771|[Female]| 15 | 182 | 55 | 39 | 16 | 371 | 90
KU |44265 |[Female]| 15 | 183 | 63 | 38 | 17 | 327 | 93
KU |44266 |[Male] | 15 | 175 | 60 | 30 | 13 | 160 | 43
UMMZ|117770|[Male] | 15 | 174 | 64 | 34 | 15 | 245 | 74
----+------+--------+------+--------+----------+----+-----+----------+------

Considerably more variation occurs in color and in the arrangement
of markings than in squamation. The ground color of the two
specimens from Creel is black with little or no trace of brown, and
the rings are white. Ground color in the remaining paratypes ranges
from grayish black, with some brownishness on the belly, to dark
brown, the colors in one specimen approximating the range from Mummy
brown to Dresden brown, becoming paler posteriorly and ventrally.
The head is slate gray to blackish brown in all the specimens. Those
having a suggestion of brown on the head tend also to have more
brown on the body.

The dark band on the neck is complete in four of the paratypes and
incomplete (as in holotype) in one. Pale marks on the prefrontals
are lacking in three of the paratypes and the pale mark between the
parietals is lacking in two specimens (fused with white band on neck
of one specimen). Pale postnarial crescents are evident in three
paratypes.

As stated above, the rings on the holotype are mostly complete.
Exceptions occur between the 13th and 15th white rings where two
black rings are fused on the left side, rendering one black and one
white ring (the 14th) incomplete. Also, where the ninth and tenth
white rings fuse on the left side, they enclose a black ring and
render it incomplete. The markings of the three smaller paratypes
are substantially the same as those of the holotype--com