Isaac Dunbar Affleck, Texas Ranger and entomologist, son of Anna (Dunbar) and Thomas Affleck, was born on October 24, 1844, in Washington, Mississippi. He came to Texas with his parents in 1858 and spent most of his life at Glenblythe Plantation, near Brenham. He attended Bastrop Military Institute (see TEXAS MILITARY INSTITUTE, AUSTIN) from 1859 to 1861. During the Civil War he served in Terry's Texas Rangers (the Eighth Texas Cavalry). On December 26, 1876, he married Mary Foster Hunt of Kentucky (see AFFLECK, MARY HUNT). Affleck was a student of politics, science, and Texas history and contributed frequently to the press. He made intensive study of ants. Part of his findings on the Texas agricultural ant and the cutting ant are contained in H. M. McCook's The Natural History of the Agricultural Ant of Texas (1880). Affleck edited August Santleben's A Texas Pioneer in 1910. He died in Austin on April 18, 1919, and was buried at Brenham. Much of his Civil War correspondence has been edited and published.