_Distribution._--The southern part of the Mexican Plateau in the states of Michoacán, México, and Morelos, the Sierra de Coalcomán in southern Michoacán, and 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. _México_: 40 km. N of Ciudad México, UIMNH 36223. _Michoacán_: Acuaro de las Lleguas, UMMZ 112565; Dos Aguas, UMMZ 118786, 119567-8; 40 km. E of Morelia, UMMZ 101932; Tancítaro, CNHM 37126, 39069-72. _Morelos_: 1 km. W of Tepoztlán, 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 Volcán Agua, Sacatepequez (Slevin, 1939: 400), and one from Dueñas, 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; Río Los Positos, 5.5 km. NE of Yepocapa, UMMZ 107061; Río Sobolopop, 8 km. W of Patzún, UMMZ 107064; Yepocapa, UMMZ 107060. _El Quiche_: Nebaj, UMMZ 89202. LITERATURE CITED BOULENGER, G. A. 1894. Catalogue of the snakes in the British Museum (Natural History). London, 2:xi + 382 pp., pls. 1-20. COPE, E. D. 1860. Descriptions of reptiles from tropical America and Asia. Proc. Acad. Nat. Sci. Philadelphia, 1860:368-374.