Mac OS 10.12, AucTeX 11.91

Question

I'm using LaTeX extensively and would like to be able to define an environment "examples" that combines the advantages of providing a complete "itemize" environment, while at the same time also prompting for an optional label, and prefixing "ex:", if a label is given:

\begin{examples}
\label{ex:given_label}
\item [cursor here]
\end{examples}

I have tried adding LaTeX-add-environments in my .emacs file, and it seems that I can either get the itemize environment or the prompting for the label:

(add-hook
 'LaTeX-mode-hook
 (lambda ()
   (LaTeX-add-environments
        '("examples" LaTeX-env-label))
   (add-to-list 'LaTeX-label-alist '("exampples" . "ex:"))))


(add-hook
 'LaTeX-mode-hook
 (lambda ()
   (LaTeX-add-environments
    '("examples" LaTeX-env-item))))

But how can I combine both of these definitions? Any advice is greatly appreciated.