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— A new species of Suciobelba, S. tumulata, and a new genus and species, Parisuctobelba septenia, are described from collections of oribatids taken in coal strip-mining spoil banks near Hayden, Colorado. The new species are compared with members of the family from North America and Europe. The new genus is differentiated by a smooth, narrowed sensillum and seven pairs of genital setae. Taxonomic and ecological data are also discussed. Studies of oribatid mites taken from spoil banks in the Yampa Valley yielded some interesting forms not previously described in the literature. Among these representatives are two new mites in the family Suctobelbidae; one is a new genus and species, the other a new species of the genus Suctobelba. In a review of the literature of the family Suctobelbidae, we noted that one of the most recent citations concerning the North American forms of this family is the work of Jacot (1937). In Europe, Forsslund (1941) reviewed the Swedish species; Strenske (1951, 1955, 1963) summarized the north German species; and Willmann (1953) described a new genus. The later work of Moritz (1970a, 1970b, 1970c) involves revisional material on the genus Suctobelba, including a review of the type of the genus, Suctobelba trigona (Michael) Paoli, 1908, Suctobelbila (1974), and Suctobelbella (197gc). Balogh (1968) described a new species of Suctobelbila from New Guinea; Balogh and Mahunka (1974) described a new species of Suctobelbila from Cuba. Comparisons of the new species of Suctobelba with examples referred to in the above literature show that the new species differs in its larger size and morphology from species collected by Jacot (1937) in the United States and by Hammer (1952, 1955) in Canada and Alaska. This new species is also different from those European species reviewed by Moritz (1970a) as well as Milhelcic (1956), and from the Japanese species described bv Aoki (1961). The new species of Suctobelba resembles most closely the European typo, Suctobelba trigona (Michael) Paoli,' 1908, and S. punctata Hammer, 1955. The major differences are indicated in the diagnostic characteristics included below with the species description. Suctobelba tumulata, n. sp.

New species of oribatids from western Colorado (Acarina: Cryptostigmata, Suctobelbidae)