Enicocephalomorpha is an infraorder of the order Hemiptera

Hemiptera

Hemiptera is an order of insects most often known as the true bugs , comprising around 50,000–80,000 species of cicadas, aphids, planthoppers, leafhoppers, shield bugs, and others...

 ("true bugs"). The infraorder was formerly thought to be related to the Reduviidae

Reduviidae

Reduviidae is a large, cosmopolitan family of predatory insects in the suborder Heteroptera...

 because of similarities in head structure. Entomologists now believe it is different enough from other Hemiptera

Hemiptera

Hemiptera is an order of insects most often known as the true bugs , comprising around 50,000–80,000 species of cicadas, aphids, planthoppers, leafhoppers, shield bugs, and others...

to constitute a separate suborder and probably represents the sister group of the rest of the order.