A new species, Aleuropleurocelus sampsoni Sánchez-Flores & Carapia-Ruiz sp. nov. (Hemiptera: Aleyrodidae), from the state of Tamaulipas, Mexico, is described. It was collected on the underside of Karwinskia humboldtiana (Roemer & Schultes) Zucc. (Rhamnaceae) leaves, a common plant known as “tullidora” because it is toxic and can induce severe neurological damage in humans and animals that consume fruits, in Ciudad Victoria and Llera, Tamaulipas, Mexico. A key to species of the ceanothi group of the genus Aleuropleurocelus is proposed. Microphotographs of morphological structures of pupariae are provided; differences with Aleuropleurocelus granulata (Sampson & Drews) (Hemiptera: Aleyrodidae) and other related species is discussed.