Wiktionary
hippo fly
n. A species of biting horsefly, found around southern Africa, (taxlink Tabanus biguttatus species noshow=1).
Usage examples of "hippo fly".
At the head of my gang of stalwarts, laden with food and equipment, feeling a little like Scott or bold Cortez, I led them towards the gap in the cliffs which had become our regular route to the top - and ten hours later, sweaty, bedraggled, scratched by thorns, stung by hippo fly and other insects, broiled by the sun and in a filthy temper, I led them down again.