Agkistrodon bilineatus bilineatus Günther
Ancisdrodon bilineatus Günther, Ann. Mag. Nat. Hist., ser. 3, 12:364, 1863.—Pacific coast of Guatemala.
Agkistrodon bilineatus bilineatus, Burger and Robertson, Univ. Kansas Sci. Bull., 34 (1):213, October 1, 1951.
Apatzingán; El Sabino; La Playa; Los Reyes.
All specimens from Michoacán are from inland localities between 300 and 1500 meters. The one from Los Reyes (USNM 46416) was collected by Nelson and Goldman on February 13, 1903. The elevation of Los Reyes (1500 meters) seems unusually high for this species, but otherwise there is no reason to doubt the authenticity of the record. Goldman (1951:192) in his description of Los Reyes stated: "Los Reyes is near the boundary between the Lower Austral and Arid Upper Tropical Zones but is preponderantly tropical in zonal character. The regular crops are mainly sugar cane, rice, and corn." Thus the biotic features of the area are not noticeably different from those at El Sabino and La Playa at lower elevations. The development of extensive agriculture through irrigation in the Tepalcatepec Valley and planting of rice and sugar-cane in that area may produce a more widespread habitat for this snake.
The absence of specimens from the coastal lowlands is due solely to inadequate collecting; the natives there know the snake and report that it is not uncommon in certain areas.
Crotalus basiliscus basiliscus (Cope)
Caudisonia basilisca Cope, Proc. Acad. Nat. Sci. Philadelphia, September 30, 1864.—Colima. Type locality restricted to Colima, Colima, México, by Smith and Taylor (1950a:328).
Crotalus basiliscus basiliscus, Gloyd, Nat. Hist. Misc., 17:1, April 23, 1948.
Apatzingán (4); Camachines; Coalcomán; El Ticuiz.