This may be a caterpillar known as “cara de nino” in Central Mexico
Mon, Jun 1, 2009 at 5:28 AM
I have been trying to find out more about this insect for quite a while, but don’t even know where to start. I only saw one of them while living in Guadalajara, Mexico. I have been told that it is a caterpillar that pests avocado trees. It is, well, avocado green with darker lines zigzagging its oval-shape body. Its head is eerily round and shiny. Some say it has a forked, red tongue, which comes out of its mannequin-looking mouth. They are called “cara de nino” (baby face) bugs.
Guadalajara, Mexico, for sure
This is some species of Swallowtail Caterpillar. Your photo does not have enough detail to allow for an exact species identification, but it is in the genus Papilio.
Update: Wed, Jun 3, 2009 at 8:15 PM
Sometimes when I log in, type a comment, and then click “Post”, a message states that my words are awaiting approval. More often, like today, I see no such affirmation, which leads me to suspect that my two comments went into a black hole. Thus, I’m also sending them to you directly – hope that’s OK.
The answer can be found here (from Guatemala) . . .
. . . and here (more specifically, Veracruz):