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Ten genera with one new subgenus and 17 species from Yemen are described and illustrated. Thirteen of these species are new: Bryobia tuttlei, B. pseudorubrioculus, Pseudobryobia abbatielloi, Beerella yemenensis, Paraplonobia dactyloni, Neopetrobia hilariae, Eutetranychus prunL E. ricinus, E. sanaae, E. transverstriatus, Mixonychus neoacaciae, Oligonychus dacOdonL and O. oenotherae. Bryobia (Septobia) bakeri is newly recorded from this country. Four other undetermined species (all females) are described and figured: Eotetranychus sp. ex Hilaria sp., E. sp. ex Solanum elaeagnifolium Cav., Oligonychus sp. ex Convolvulus arvensis L., and O. sp. ex Hilaria sp. Four known species are briefly redescribed and illustrated in order to provide the first comprehensive report of the spider mite fauna of Yemen.

The generic characters for Ununguitarsonemw Beer tions and a redescription for this taxon are included, A and Nucifora are emended and U. peacocki n. sp. is dekey to species for this genus is included. New Pse~doscribed. Descriptions and illustrations for Neterotar-tarsonemoides spp. are : scolyti, americanus, and fechteri. sonenzus milleri and H. rcakaharai n. spp, are presented, The adult male of Tarsonenzus ips is described and illusas well as a key to species for this genus. trations for the pupa and immature stages are given. A lectotype is designated for Pseudotarsonemoides ec-New Tarsonentzrs spp. are: kenned~~i, krantzi, .re,ilkinsoni, co@togasteris Vitzthum, the type for the genus. Illustra-and szukii.

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