what insect has the largest brain?

Answer 1

Probably Megasoma acteon or South American Longhorn beetle.

Answer 2

The insect with the biggest brain would have one of the biggest insects. Here is a quote from a website:

"For sheer length you can't beat a female Giant Walking Stick (Phobaeticus serratipes). Found in Malaysia and Singapore, looking like an assemblage of twigs, it is perfectly camouflaged among the branches where it lives. The longest specimen on record was an amazing 21.8" (55.5cm). Some people even keep these huge insects as pets.

The Giant Walking Stick may be long, but it doesn't have much mass. For that you have to turn to the giant scarab beetles. Among them, entomologists have settled on 5 contenders:

The South American Longhorn Beetle (Titanus giganteus) of French Guiana makes perhaps the most impressive showing with a body length over 6.5" (16.7cms).

A shorter but far thicker competitor is the Acteon Beetle (Megasoma acteon) of South America. Males can grow to 5.3" (13.5cms) long by 1.6" (4cms) thick.

The Elephant Beetle (Megasoma elephas) found in Mexico and Venezuela has a shorter body than the Aceton, but a longer snout, making its total recorded length 5.4" (13.7cms).

Bringing up the rear are two species of Goliathus: regius and goliatus, both measuring in at 4.3" (11cms)."
http://www.wisegeek.com/what-is-the-worlds-biggest-insect.htm

It would appear that beetles are the largest insects on the planet; this would give them the biggest brains.

If you are talking about the biggest brain:size ratio i cant find any information about that. It seems people usually dont care about how "smart" insects are

Answer 3

The insect with the largest brain in proportion to its size is the ant.

Answer 4

Insects don't have brains.
They have groups of nerve cells called ganglia that function in similar ways to brains, but they are not technically classified as brains.

Answer 5

The one with "Esquire" at the end of their name.