Although usually treated as unified subject, in many respects the two components of what is broadly described as 'medical and veterinary is usual, the term entomology is entomology' are clearly distinct. As used loosely here to refer to both insects and arachnids. In medical entomology blood-feeding Diptera are of paramount importance, primarily as vectors of pathogenic disease. Most existing textbooks reflect this bias. However, in veterinary entomology ectoparasites such as the mites, fleas or dipteran agents of myiasis assume far greater prominence and the most important effects of their...