House centipedes
Locusts
Siafu
Wasps
Giant hornet
I'm not sure what you are trying to ask but the most harmful insect would be the Asian Giant Hornet.
This giant hornet's venom can be detrimental to your red blood cells causing kidney failure and death. After being stung on both the head and legs during the summer, a victim suffered sting holes the size of quarters, and two months later, remains hospititalized.
The size of Asian Giant Hornet is comparable to a human thumb. The giant hornets are attracted to human sweat, alcohol, and sweet flavors and smells. Running only makes them want to chase you even more, so it's your best bet to keep it cool.
