Not to nitpick, but the subspecies name is agalma, not algama. The Sierra San Pedro Martir locale would be the southern most locale and the Sierra Juarez are the northern locale for the subspecies.

The difference(generally speaking) between the two...the Juarez locale are larger and more robust with a wider head and the Martir locale have narrower head width and a little smaller in length and robustness.

Juarez Wonders