sis of this specimen,
Davis and Dixon suggested that _Salvadora bairdi_ and _S. lineata_ were
subspecifically related. The examination of the large number of
specimens from Michoacan has revealed this kind of coloration in only
one other specimen, an individual from Tacicuaro, in which the stripes
diverge, but do not extend through the eye onto the loreal. Data on
scutellation for the large series from Tancitaro were given by Schmidt
and Shannon (1947:78), and for the series from Tacicuaro by Smith
(1943:466).

~Salvadora mexicana~ (Dumeril, Bibron, and Dumeril)

_Zamenis mexicanus_ Dumeril, Bibron, and Dumeril,
Erpetologie generale, 7 (pt. 1), p. 695, 1854.--Cape
Corrientes, Jalisco, Mexico.

_Salvadora mexicana_ Guenther, Ann. Mag. Nat. Hist., ser. 3,
12:349, 1863.

Apatzingan (12); Capirio (2); El Sabino (5); Huetamo; La
Placita; La Playa (4); Lombardia; Nueva Italia; Ojos de Agua
de San Telmo; Oropeo; Rio Cancita, 14 km. E of Apatzingan;
Santa Ana.

This is one of the most abundant snakes in the arid lowlands of the
Tepalcatepec Valley; observations indicate that it probably is equally
abundant on the coastal lowlands. Near Apatzingan as many as five of
these snakes have been seen in one-half hour. The snakes seem to be
equally abundant and active in the dry season and in the rainy season.
Most individuals were seen on the ground, but two were found in low
trees. On several occasions _Salvadora mexicana_ was observed in pursuit
of lizards on the ground. Captured individuals regurgitated
_Cnemidophorus costatus zweifeli_, _Cnemidophorus deppei infernalis_,
_Sceloporus horridus oligoporus_, _Sceloporus pyrocephalus_, and
_Urosaurus gadowi_.

_Salvadora mexicana_ inhabits only the arid scrub forest at elevations
from sea level to about 1000 meters.

~Sibon nebulatus~ (Linnaeus)

_Coluber nebulatus_ Linnaeus, Systema naturae, ed. 10, 1, p.
222, 1758.--Africa (in error). Type locality restricted to
Jicaltepec, Veracruz, Mexico, by Smith and Taylor
(1950a:349).

_Sibon nebulatus_, Taylor, Univ. Kansas Sci. Bull., 26:473,
November 27, 1940.

Aquila.

The one specimen from Michoacan was collected by Peters (1954:30) in
tropical semi-deciduous forest on the coastal foothills of the Sierra de
Coalcoman. As presently known, the range of this species in western
Mexico extends from Chiapas to Nayarit. Throughout this region the