Blacklegged Tick Distribution Maps (IMAGE) Entomological Society of America Caption The map on top is from 1998, and the one below it is from 2015. Red indicates a county where I. scapularis is established, and blue indicates that it has been reported. Green indicates a county where I. pacificus is established, and yellow indicates that is has been reported. Credit Entomological Society of America. Usage Restrictions Credit Entomological Society of America. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.