Exoprosopa jacchus is a species of 'bee flies' belonging to the family Bombyliidae subfamily Anthracinae. Commonly named 'Silvery bee-fly', this species is present in most of Europe. The average body length of the adults reaches 12 millimetres (0.47 in). The head and the thorax are dark-brown. The thorax is quite hairy and marked by silvery-white scales. The abdomen is blackish with a few silver hair stripes and it is hairy on the sides. The wings are mottled light and dark-brown, with hyaline patches on the front border cell (R1). The third segment of the antennae is longer than the fourth.