Abstract
Two new species of Alloscopus Börner (Orchesellidae: Heteromurinae) are discovered and described from southern Thailand. The first species, Alloscopussago Jantarit & Manee, sp. nov. was found in a sago palm forest (Metroxylonsagu Rottb.), a true sago palm species native to Southeast Asia and typically located in lowland freshwater swamps in Phatthalung Province. The second species, A.jantapasoae Jantarit, Nilsai & Manee, sp. nov. was sampled from a dark zone within a cave environment in Trang Province. Both species are characterized by the absence of eyes and mucronal spines, the presence of a PAO, two rows of smooth chaetae on the manubrium, and dental spines. However, they differ in several morphological features, including the number of macrochaetae on the 'A' series of the head, Th. II and Abd. IV; labial basis chaetotaxy; the presence of smooth chaetae on tibiotarsi; the number of chaetae on both the anterior and posterior ventral tube; and the number of the inter-teeth on the claw. The discovery of these two new species increases the total number of Alloscopus species recorded in Thailand to six species with a total of 17 recognized species globally. An updated key to the world species of Alloscopus is also provided.