_Type._--No type specimen is known. Cope (1861: 300 and 1887: 72) stated that the specimen was from the southern Mexican Plateau and that it was collected by Carlos Sartorius. Smith and Taylor (1945: 108 and 1950: 348) gave the type locality as Jalapa, Veracruz. Although this locality was the source of many specimens sent to the United States by Sartorius, it is not within the known range of _lineaticollis_, and therefore cannot appropriately be thought of as the type locality. In the absence of a type specimen and a justifiable type locality, I hereby designate as a neotype, University of Michigan Museum of Zoology, No. 114668. This specimen was collected 24 kilometers northwest of Ciudad Oaxaca, Oaxaca, on February 29, 1956, by William E. Duellman. It is an adult female having 229 ventrals, 67 caudals, and long black neck-stripes followed posteriorly by 23 light-centered dorsal body-blotches. _Diagnosis._--This subspecies is characterized by the presence of continuous dark paravertebral stripes on the anterior part of the body, and light-centered dorsal body-blotches and lateral intercalary spots (Pl. 45, Fig. 2). There are 229 to 258 ventrals, 54 to 72 caudals, and 23 to 45 dorsal body-blotches posterior to the neck-stripes. The young are colored like the adults. _Variation._--Specimens from the southern part of the range in Oaxaca have 229 to 245 ventrals (average 238.3); to the north on the Mexican Plateau in the state of Michoacán seven specimens have 231 to 243 (average 237.1) ventrals. In the relatively isolated mountain ranges of the Sierra del Sur in Guerrero and the Sierra de Coalcomán in southern Michoacán the ranges of variation and average numbers of ventrals are, respectively, 234 to 258 (245.8) and 236 to 246 (242.2). The longest neck-stripes are found in specimens from Oaxaca and Guerrero; nevertheless, some specimens from the Mexican Plateau in Michoacán and three of the four specimens from the Sierra de Coalcomán have neck-stripes equally long. One specimen from 40 kilometers north of Ciudad México and several from the vicinity of Tancítaro, Michoacán, have rather shorter neck-stripes. One specimen from Dos Aguas, Michoacán, has the neck-stripes partially fragmented into rows of spots as in _gibsoni_. On the basis of specimens from Tancítaro, Michoacán, Schmidt and Shannon (1947: 79) described the subspecies _brevilineata_, which they diagnosed as differing from _lineaticollis_ in having fewer ventrals and shorter neck-stripes. The present data suggest that the characters used to diagnose the subspecies are variable not only in Michoacán, but throughout the range of the species. Consequently, _Pituophis (deppei) brevilineata_ Schmidt and Shannon (1947) is placed in the synonymy of _Pituophis lineaticollis lineaticollis_ Cope (1861).