Abstract
Two new species of the bristletail family Machilidae are described: Ditrigoniophthalmus ongudaensis sp. n. and Allopsontus altaicus sp. n. The former, D. ongudaensis sp. n., differs from the known species of the genus Ditrigoniophthalmus Kaplin 1979 by the club-shaped paired ocelli, the relative lengths of the abdominal styli and urocoxites VIII and IX, and the basal and terminal portions of the penis in the male. Allopsontus altaicus sp. n. belongs to the subgenus Anisopsontus Mendes 1990 and is especially similar to the following four consubgeners: A. ciliatus (Wygodzinsky 1970), A. tekelensis Kaplin 2015, A. lineatus Kaplin 2002 and A. zinchenkoi Kaplin 2019. Yet, A. altaicus sp. n. differs in the number of articles of the ovipositor, the number of digging spines on its anterior and posterior gonapophyses, the number of rosette-shaped sensilla on the anterior femora of the male, the width to length ratios of paired ocelli in both sexes, the length to width ratios of the last article of the labial palps.
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