Elite

The Elites/Sangheili (Latin Macto cognatus, meaning "I honor my father's blood") are a reptilian (or theropodian) species of fierce, proud, strong, intelligent warriors and skilled combat tacticians. Sangheili are named after their home planet, Sanghelios. Known by most Humans as Elites, presumably due to their adeptness and their skills in combat, the Sangheili formed the military backbone of the Covenant for almost the entirety of its existence. They have an rivalry with the Brutes. The Elites and the Prophets found the Covenant after a war, centuries ago.

Pictures
http://images3.wikia.nocookie.net/halo/images/thumb/3/34/Sanghelios.jpg/300px-Sanghelios.jpg