MSD Manual

Please confirm that you are a health care professional

honeypot link

Spider Flies/New Forest Flies


Charles M. Hendrix

, DVM, PhD, Department of Pathobiology, College of Veterinary Medicine, Auburn University

Last full review/revision Aug 2013 | Content last modified Aug 2013

The spider or new forest fly, Hippobosca equina, is widely distributed throughout Europe, Asia, and Africa. These winged keds parasitize horses and rarely cattle throughout the UK. Its bite is characterized as a nuisance and disturbance to large domestic animals. It has a predilection for feeding sites in the perineal region and between the hind legs.

The winged adult is ~10 mm long with a flattened, shriveled body. The life cycle is similar to that of Melophagus ovinus, in that the female produces one larva at a time, and at the time of maturity the larva falls away from the female fly and pupates in the soil.

Treatment is rarely indicated, but many of the repellents used for other blood-feeding periodic parasites may be used.

Others also read
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID

Test your knowledge

A client calls her veterinarian because she has found a tick on her dog and she is not sure how to remove it. Which of the following is the most appropriate instruction for tick removal?
Become a Pro at using our website 

Also of Interest

Become a Pro at using our website