This seems to be the case with the busy hymenopter generally in the highlands of Africa; the lowland swarms have been the terror of travellers from Mungo Park's day to that of the first East African Expedition.    From Wordnik.com.  [Two Trips to Gorilla Land and the Cataracts of the Congo Volume 2] Reference

This seems to be the case with the busy hymenopter generally in the highlands of Africa; the lowland swarms have been the terror of travellers from Mungo Park’s day to that of the first East African.    From Wordnik.com.  [Two Trips to Gorilla Land and the Cataracts of the Congo] Reference