Could be 'Tantilla planiceps - Western Black-headed Snake'. They live mostly in California and are mildly venomous, about 3.5 - 15.5 inches long. Go to http://www.californiaherps.com/snakes/pages/t.planiceps.html
for pics.
I do not have the capability to display images. However, a black and white striped snake you may be referring to is the California kingsnake, which has distinct alternating black and white stripes along its body.
Based on your description, the snake you are referring to is likely the Eastern garter snake (Thamnophis sirtalis). This species is known for its tan body, black head, and thin yellow band around its head, making it easily recognizable.
Yes, the peak of their black body spectrum is in the UV band but to our eyes the color looks blue or blue white depending on how far into the UV band the black body peak is.
If the stripes are light in color, maybe even off white it could be a CA king snake.
The snake you are describing is likely the Eastern King Snake (Lampropeltis getula). This non-venomous snake is known for its distinctive black body and often has a white or cream-colored patch on its head. Eastern King Snakes are found in various habitats across the southeastern United States and are known for their ability to constrict and consume other snakes, including venomous species.
The Water moccasin has the alternative name of 'Cotton-mouth'. The inside of the snake's mouth is white, while the rest of its body is a mixture of dark green, brown, dark grey or yellow.
The pacific black dragon inhabits the area of the eastern pacific oceans. The pacific black dragon has a body similar to that of a snake. The snake is black outside and black on the inside of its body.
A Sinaloan milk snake has vibrant red, black, and white bands that run along the length of its body. They are nonvenomous and often mistaken for coral snakes, but can be distinguished by their red and black bands touching. They can grow to be around 2-3 feet long.
Eastern smooth green snake
probably a coral snake or something
Dratini looks like a small snake with a blue and white colored body along with black eyes a white nose and two small wings on it's head.
The Speckled King snake is a black snake with yellow or orange spots speckled over it's body. Another black snake with yellow spots would be Baby Eastern Black King Snake. Both are completely black with yellow speckles.