i found these 2 bugs on my lychee leaves.
the first one, i see every year on my lychee leaves when I bring them indoors. i think they start off light green so they are barely distinguishable from the vein of the leaf, and then turn brown as they get bigger. they are always attached to the vein, on the underside of the leaf.
the second one, not sure if i have seen them before
bug 1
bug 2
bug 2 pic 2