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.
1861. Contributions to the ophiology of Lower California, Mexico, and Central America. Proc. Acad. Nat. Sci. Philadelphia, 1861:292-306.
1887. Catalogue of the batrachians and reptiles of Central America and Mexico. Bull. U. S. Natl. Mus., 32: 1-98.
Duméril, A. M. C.