Volume 22 contains a variety of papers on marine and terrestrial invertebrates.
Preface: H.R.H. Prince Saud bin Faisal bin Abdulaziz 1
Foreword: H.E. Dr Saleh bin Abdulrahman Al-Athel 3
Introduction: Editors 4
Bryozoans
AMUI, A.-M. & KASELOWSKY, J.: Bryozoa from the Gulf of Aden and the Red Sea, Part I (Collections from the 5th expedition of the R.V. Meteor) 7
Polychaetes
WEHE, T.: Revision of the scale worms (Polychaeta: Aphroditoidea) occurring in the seas surrounding the Arabian Peninsula. Part I. Polynoidae 23
Crustaceans
TÜRKAY, M. & SPIRIDONOV, V.A.: Deep water swimming crabs of the subgenus Charybdis (Goniohellenus) of the western Indian Ocean (Crustacea: Decapoda: Portunidae) 199
Arachnids
AL-KHALIFA, M.S., DIAB, F.M., AL-ASGAH, N.A., HUSSEIN, H.S. & KHALIL, G.A.: Ticks (Acari: Argasidae, Ixodidae) recorded on wild animals in Saudi Arabia 225
DIAB, F.M., AL-KHALIFA, M.S., AL-ASGAH, N.A., HUSSEIN, H.S. & KHALIL, G.A.:Ticks (Acari: Argasidae, Ixodidae) infesting livestock in Saudi Arabia 233
UECKERMANN, E.A., VAN HARTEN, A. & SMITH MEYER, K.P.: The mites and ticks (Acari) of Yemen: an annotated check-list 243
ROSS, E.S.: The insect order Embiidina of northeastern Africa and the Red Sea Region 287
BOHN, H. & VAN HARTEN, A.: Contribution to the cockroach fauna (Insecta: Blattoptera) of Yemen, with remarks on adjacent areas 345
SZIRÁKI, G. & VAN HARTEN, A.: The dusty lacewings (Neuroptera: Coniopterygidae) of the Arabian Peninsula 381
VIT, S.: Scydmaenini (Coleoptera: Scydmaenidae) of the Arabian Peninsula 435
VAN NOORT, S. & VAN HARTEN, A.: The species richness of fig wasps (Hymenoptera: Chalcidoidea: Agaonidae, Pteromalidae) in Yemen 449
DISNEY, R.H.L.: Scuttle Flies (Diptera: Phoridae) Part I: all genera except Megaselia 473