the Sierra del Sur in Guerrero and Oaxaca.

_Specimens examined._--Total of 25, as follows: _Guerrero_: Acahuizotla,
USNM 46537; Chilpancingo, CNHM 38356-9, UIMNH 35000, UMMZ 85724-5;
Omiltemi, USNM 46462. _M['e]xico_: 40 km. N of Ciudad M['e]xico, UIMNH
36223. _Michoac['a]n_: Acuaro de las Lleguas, UMMZ 112565; Dos Aguas,
UMMZ 118786, 119567-8; 40 km. E of Morelia, UMMZ 101932; Tanc['i]taro,
CNHM 37126, 39069-72. _Morelos_: 1 km. W of Tepoztl['a]n, UMMZ 101931;
Tres Cumbres, UIMNH 35001. _Oaxaca_: 25 km. N of El Soledad, UIMNH 6210;
24 km. NW of Oaxaca, UMMZ 114668; San Pedro Quiechapa, USNM 110893.

=Pituophis lineaticollis gibsoni= Stuart, new combination

_Pituophis deppei gibsoni_ Stuart, Proc. Biol. Soc. Washington,
vol. 67, p. 172, August 5, 1954.

_Type._--University of Michigan Museum of Zoology No. 107060, obtained
by Colvin Gibson. Type locality: Yepocapa, Chimaltenango, Guatemala.

_Diagnosis._--This race is characterized by paired, elongated,
pale-centered, paravertebral spots on the anterior part of the body.
Posterior to the paired spots are 22 to 27 dorsal body-blotches; these
and the lateral intercalary spots have pale centers. There are 234 to
246 ventrals and 57 to 65 caudals.

_Variation._--The few specimens that are available from a small
geographic area do not permit a discussion of geographic variation at
this time. All of the specimens have the paired paravertebral spots and
blotches with light centers. In this respect the population of
_lineaticollis_ east of the Isthmus of Tehuantepec is noticeably
different from the nominal subspecies in the Mexican highlands. Smith
and Taylor (1945: 108) listed a specimen from San Cristobal, Chiapas. I
have not seen this specimen and so do not know to which subspecies it
belongs. On geographical grounds it probably is _gibsoni_.

_Distribution._--Guatemalan highlands and probably highlands of Chiapas.
Aside from the specimens examined, two others are known--one from
Volc['a]n Agua, Sacatepequez (Slevin, 1939: 400), and one from
Due[~n]as, Sacatepequez (Boulenger, 1894: 65); these localities are not
shown in figure 1.

_Specimens examined._--Eight, as follows: Guatemala: _Chimaltenango_:
Chichavac, CNHM 1927; Finca El Tesoro, 3 km. SE of Acatenango, UMMZ
107062-3; Finca Recreo, 4.5 km. SW of Yepocapa, UMMZ 107381; R['i]o Los
Positos, 5.5 km. NE of Yepocapa, UMMZ 107061; R['i]o Sobolopop, 8 km. W
of Patz['u]n, UMMZ 107064; Yepocapa, UMMZ 10