Bug Blog

Giant Bugs Climbing Desert Trees

Giant Bugs Climbing Desert Trees

They only thrive on mesquite trees, and pass their time by munching on the tree’s tiny leaves.  Because they do their host no damage, and usually crawl on its tops, they are a lesser known insect: the mesquite bug.  Scientifically labeled as Thasus neocalifornicus, they live in New Mexico, mesquite-filled Arizona and, of course, California.


While large and beetle-like, they are not of the beetle family.  Known colloquially as the “giant mesquite bug” they are scaling tree trunks this time of year, so are more likely to be spotted by the layperson.  While they resemble beetles, they are in fact “true bugs.”

What the difference between a beetle and a bug, anyway?

Beetles are in the largest order of insects, Coleoptera, while true bugs are among one group of Hemipterans.

Structurally, beetles have compound eyes in the head, mouths made for chewing, and antenna with little branches called antennomeres – of which they have up to ten.  True bugs have four large antennomeres and their mouths don’t chew but pierce, or suck.  Beetles bodies are one hard shell, whereas bugs bodies are only hard in the front, where forewings are, then membrane-like near the tips.  Simply put, beetles have a single, rounded shell that is hard whereas bugs tend to look like they have separate parts in a clunkier, more cornered body shape.