not a mexican black king or a black king. The "sock" head and pattern are dead giveaways.
Here are some pics of black kings and my splendida....
Black kings...



And my splendida (Desert king)...

She is a little brighter than yours, and that is just her coloration. Some of the splendida darken up, just as yours. This is common in some kings that come from locale animals that are not het for anything.
Here is an example, my pair of cal kings. The male is a plain old cal king het for nothing....

This is a pic from last year, and he has darkened up even since then.
Here is my female, and she is het albino....

Notice the color difference.
Hope this helps, and you cant always go by what a pet store tells you, as about 90% of the time they are way off mark!!!
Brian
>>Drat!
>>Now youv'e made me have to think!
>>I'm gonna have to check Conont and Collins - meanwhile, here's another pic of her cute little almost all black head!
>>
>>Thanks!
>>
>>John D
>>
>>
>>-----
>>0.1 Creamsicle Cornsake "Yolanda"
>>1.0 Bairds Ratsnake "Steely Dan"
-----
RATS
1.0 Corn snake "Warpath"(KY locale)
1.0 Black rat snake "Havok" (KY locale)
1.1 Black rat snakes "Reaper and Mystique" (MO locale)
1.0 Albino Black rat snake "Malakai" (Dwight Good stock)
1.0 Everglades rat snake "Deadpool" (Dwight Good stock)
0.1 Greenish rat snake "Rogue" (Dwight Good stock)
1.0 Great plains rat snake "Reign Fire" (TX locale)
1.0 Grey rat snake "Punisher" (White oak phase)(Dwight Good stock)
1.0 Yellow rat snake "Wolverine" (Dwight Good stock)
RACERS
1.0 Eastern Yellow Belly racer "Nightcrawler" (MO locale)
KINGS
1.1 California king snake "Bandit" & "Moonstar" (Coastal phase)
1.1 Prairie king snakes "Bishop" & "Askani" (KY locale)
1.0 Black king snake (KY locale)
0.1 Desert Kingsnake "Psylocke"
0.1 Florida Kingsnake "Shard"
0.1 Speckled Kingsnake "Haven" (MO locale)
2.0 Eastern kings
1.0 Arizona Mtn King
MILKS
2.0 Eastern/red Milk intergrade "Cable" and "Omega Red" (KY locale)
BULLS/GOPHERS/PINES
0.1 Sonoran Gopher "Husk"
1.0 Kankakee bull (Phil Peak stock)
Good luck and Happy Herping
Brian