CHAPTER VI.

PARASITES FREE DURING THEIR WHOLE LIFE.

Leeches--Vampires--Cylicobdellæ--Branchellions--Gnats-- Blackflies--Mosquitoes--Gnats in high Latitudes--Tsetse-- Ox-flies--Pteropti--Nycteribiæ--Bugs-- Lice--Fleas--Itch Insect--Acari on Beetles and Bees--Cheyletus eruditus 107