stable flies on cow leg Stable flies (Stomoxys calcitrans) are serious pests of livestock worldwide. Their painful bites agitate livestock, reduce weight gain, and, in extreme cases, can result in mortality. (Photo credit: David Taylor, Ph.D.) Leave a Reply Cancel reply This site uses Akismet to reduce spam. Learn how your comment data is processed. Search Search for... Search Subscribe to Entomology Today! Enter your email address to subscribe to Entomology Today. You'll receive notifications of new posts by email. Email Address Get Certified!