I'd go with
Pantherophis even though it may confuse a few people and is not recognized by the EMBL Database or by the CNAH. Utiger and his buddies (2002) made a pretty good case in my opinion and Rodríguez-Robles & de Jesus-Escobar (1999) support a close relationship between Lampropeltinids (
Lampropeltis, Pituophis, Pantherophis, Rhincheilus and others). I'm no expert but I don't see how
Pantherophis can fall within one strongly supported group (Lampropeltini) and be placed in a genus with a bizillian snakes don't.
Elaphe's been considered polyphyletic for quite a while; eventually people will have to accept the new genera.
RODRIGUEZ-ROBLES and DE JESUS-ESCOBAR (1999)
UTIGER et al. (2002)
Cam