Pumping lemma problem
You are actually wrong. I'll give you a hint for the grammar of $L_1$. Rewrite it as $a^p b^r b^q c^{s-t} c^t d^t d^q e^r e^p$. Although I have no idea how the case $s = 0, q = 0$ (thus $q+t &lt; 0$) is supposed to work.

For $L_2$ there is an implicit comparison $r \leq q+r$. Take $p = q = 0$ so that the string is $b^rc^sd^re^s$. You should be able to apply the lemma here easily.