For historical reasons, Frederick Gehlbach's 1967 listing of the mexicana complex has been presented. Under this classification, Gehlbach places Webb's (1961) "greeri" under L. m. mexicana , while Stejneger's (1917) L. alterna and Flury's (1950) L. blairi receive subspecific recognition under mexicana.
Lampropeltis m. alterna (Brown)
Type Locality: Davis Mountains, Texas
Holotype: Acad. Nat. Sci. Philadelphia 14977
Collector Meyenburg, E. 1902.
Description: Primary red and black markings take on the form of rings, numbering more than fifteen (15), ventrals 211-229
Lampropreltis m. blairi (Flury)
Type Locality: "8.8 mi. west of Dryden," Texas
Holotype: Univ. Texas Nat. Hist. Coll. T 4772
Collector Flury, A., and H. Phillips. 1938.
Description: Primary red and black markings take on the form of saddles, numbering thirteen (13) or fourteen (14), ventrals 208-229
Lampropeltis m. mexicana (Garman)
Type Locality: Vicinity of Cuidad San Luis Potosi, SLP, Mexico
Syntypes: Mus. Comp. Zool. 4652-3
Collector Palmer, E. 1879.
Description: Primary red and black markings take the form of blotches, numbering thirty to fourty-seven (30-47), ventrals 190-200
Lampropeltis m. thayeri (Loveridge)
Type Locality: Miquihuana, Tamaulipas, Mexico
Holotype: Mus. Comp. Zool. 19551
Collector Brown, W. 1924.
Description: Primary red and black markings take on the form of of rings, occasionally saddles or blotches, numbering twenty-four to twenty-eight (24-28), ventrals 196-212
Today, greeri has been recognized as its own subspecies; Tanzer (1970) cited evidence that blairi is a polymorphic phase of alterna. Both have since been removed from mexicana and synonymized as L. alterna. However, the entire complex may need revision upon the capture of more specimens throughout Mexico.
Lampropeltis m. greeri
Type Locality: "Rancho Santa Barbara," Durango, Mexico
Holotype: Michigan Sate Univ. 190
Collector Greer, J., and R. Webb. 1959.
Description: Primary red and black markings take on the form of blotches, numbering twenty-eight to thirty-six (28-36), ventrals 200-204