Parin, N.V. and Abramov, A.A. (1986). [Two new species of benthopelagic fish of the genus Epigonus (Apogonidae) from the western tropical part of the Indian Ocean]. In Russian. Byulleten' Moskovskodo Obschestva Ispytatelei Prirody Otdel Biologicheskii 91(3): 53-57.[721]

Parker, H.W. (1938). A new Gecko from Socotra. Annals and Magazine of Natural History 11(1): 305-307.[722]

Parker, H.W. (1949). The snakes of Somaliland and the Sokotra islands. Zoologische Verhandelingen, Leiden 6: 1-115.[723]

Pax, F. and Hoffman, K. (1931). Euphorbiaceae. In Engler, A. and Prantl, K. (1891-1896). Die natürlichen Pflanzenfamilien nebst ihren Gattungen und wichtigeren Arten, insbesondere den Nutzpflanzen, unter Mitwirking zahlreicher hervorragender Fachgelehrten begrundet von A. Engler und K. Prantl Zweite Stark Vermehrte und Verbesserte Auflage H. Harms. Volume 19c: pp 11-233; figures 6-123. See pp 123 re Cephalocroton socotrana (Balf.f.) Pax. Leipzig: Wilhelm Engelmann.[725]

Pax, F. (1896). Euphorbiaceae. In Engler, A. and Prantl, K. (1891-1896). Die natürlichen Pflanzenfamilien nebst ihren Gattungen und wichtigeren Arten, insbesondere den Nutzpflanzen, unter Mitwirking zahlreicher hervorragender Fachgelehrten begrundet von A. Engler und K. Prantl fortgesetzt von A. Engler. Volume 3: Abteilung 5 (1896): pp 1-119; figures 1-75. See pp 75 re Cephalocroton socotranus Balf. Leipzig: Wilhelm Engelmann.[724]

Payne, W.J.A. (1964). The origin of domestic cattle in Africa. 4 figures; 14 photographs im 7 plates (Plates 5-11; Figure 11 is of the Socotran breed) Empire Journal of Experimental Agriculture 32(126): 97-113.[726]

Pelikan, A. (1907). Petrographische untersuchungen von gesteinen der Inseln Sokotra, Abd-el-Kûri und Semha. Denkschriften der Kaiserlichen Akademie der Wissenschaften in Wien. Mathematisch - Naturwissenschaftliche Klasse. Band 71(1): 63-91; 2 plates.[727]

Penrith, Mary-Louise (1983a). Revision of the Zophosini (Coleoptera: Tenebrionidae). Part 7. The African species of the subgenus Oculosis Penrith. 39 figures; 16 maps; Gazeteer on pages 358-367. Cimebasia. Journal of the State Museum, Windhoek, Series A - Natural Sciences 6(7): 291-367.[728]

Penrith, Mary-Louise (1983a). Revision of the Zophosini (Coleoptera: Tenebrionidae). Part 8. The palearctic species group of the subgenus Oculosis Penrith, the subgenus Cheirosis Deyrolle, and a monotypical subgenus from Socotra, South Yemen. 5 figures; 3 maps; Gazeteer on pages 382-384. Cimebasia. Journal of the State Museum, Windhoek, Series A - Natural Sciences 6(8): 369-384.[729]

Penrith, Mary-Lpuise (1986). Revision of the Zophosini (Coleoptera: Tenebrionidae). Part 10. Key to the subgenera, supplement, evolution and biogeography of the tribe, and catalogue. 8 figures; 29 maps. Cimebasia. Journal of the State Museum, Windhoek, Series A - Natural Sciences 6(10): 417-502.[730]

Perlo, B. van (1995). Birds of Eastern Africa. Collins Illustrated Checklist. ISBN 0-00-219937-8; 1,487 species illustrated in colour; 1,487 distribution maps. London: Harper Collins Publishers.[731]

Peters, W. (1882). Mittheilung uber die von Herrn Dr. E. Riebeck auf Socotra gesammelten Reptilien. Sitzungsber. Ges. naturforsch. Freunde Berlin 1882: 42-46.[1110]

Petit, S. (1850a). Notice sur le genre Cyclostoma, et catalogue des especes a ce genre.- J. de Conch., 1: 36-55, Paris.[1029]

Petit, S. (1850b). Notice sur les coquilles rapportees par M. Guillain, officier superieur de la marine, commandant le brick le Du Couedic.- J. de Conch., 1: 76-77, Paris.[1030]

Petit, S. (1853). Description de coquilles nouvelles.- Journal de Conch., 4: 360-369, Paris.[1031]

Petracek, K. (1968). Das Problem des Gain im Südsemitischen. Wiss. Z. Univ. Halle. 17(2-3): 139-145.[732]

Petrusson, L. and Thulin, M. (1996). Taxonomy and biogeography of Gymnocarpos (Caryphyllaceae). 8 line drawings, artist probably L. Petrusson; 2 SEM micro-photographs; 2 maps. See pp 7-10, 17-19, 20-22, figures 9, 11. Edinburgh Journal of Botany 53(1): 1-26.[733]

Peucker, Dr. (1899). The Austrian expedition to southern Arabia and Sokotra. The Geographical Journal 13(6): 638-640.[734]

Phillips, W.W.A. (1958). Petrels, Shearwaters and other oceanic birds in the north Indian Ocean. Journal of the Bombay Natural History Society 52(2 & 3): 334-348.[735]

Pichi-Sermolli, R.E.G. (1955). Tropical East Africa (Ethiopia, Somaliland, Kenya, Tanganyika). Plant Ecology. Arid Zone Research 6: 302-360. Paris: United Nations Educational, Scientific and Cultural Organisation (UNESCO).[736]

Pichi-Sermolli, R.E.G. (1956). Adumbratio Florae Aethiopicae. Part 4. Hymenophyllaceae, Negripteridaceae, Cyatheaceae. 1 figure; 1line drawing; 7 photographs (Tav. XLII-XLVI); 2 fold-out maps. Webbia 12(1): 121-146.[737]

Pichi-Sermolli, R.E.G. (1957a). Adumbratio Florae Aethiopicae. Part 5. Parkeriaceae, Adiantaceae, Vittariaceae 3 figures; 10 line drawings; 3 photographs (Tav. XCIX-C); 4 fold-out maps. Webbia 12(2): 645-703.[738]

Pichi-Sermolli, R.E.G. (1957b). Una carta geobotanica dell'Africa Orientale (Eritrea, Etiopea, Somalia). In Italian; Socotra is included in the 1:500,000 scale map of the vegetation of northeast Africa; 21 full plate photographs (Tav. I-XXI). Webbia 13(1): 15-132.[739]

Pichi-Sermolli, R.E.G. (1977). Novitates Pteridologicae Aethiopicae. 2 line drawings; 2 photographs of herbarium specimens. Webbia 32(1): 51-68.[740]

Pichi-Sermolli, R.E.G. (1978). Adumbratio Florae Aethiopicae. Part 32. Nephrolepidaceae. 3 line drawings; 3 fold out maps. Webbia 33(1): 115-136.[741]

Pietsch, Dana, (2006). Boeden der Trockentropen. Prozess- und Strukturindikatoren-gestuetzte Analyse geschichteter, polygenetischer und degradierter Boeden der Insel Socotra (Jemen). Jemen Studien 17. Ludwig-Reichert-Verlag Wiesbaden. 256 p. + 45 p. annex. Introduction and summary in English and Arabic. [1175]

Pietsch, D., Lucke, B. (20.03.2008) (2008): Soil substrate classification and the FAO and World Reference Base (WRB) systems: examples from Yemen and Jordan. ? In: European Journal of Soil Science doi: 10.1111/j.1365-2389.2008.01017.x [1181]

Pinhey, E.C.G. (1961). A Survey of the Dragonflies (Order Odonata) of Eastern Africa. pp vii + 214; London: British Museum.[1076]

Pinhey, E.C.G. (1970). Monographic Study of the Genus Trithemis Brauer (Odonata: Libellulidae). Memoirs of the entomological Society of southern Africa 11: 1-159.[1077]

Pinkerton, John (1811). A general collection of the best and most interesting voyages and travels in all parts of the world: many of which are now first translated into English. Digested on a new plan. 14 volumes. Illustrated with plates. Volume 8: 1-56. The journal of Sir Thomas Roe, Ambassador from his majesty King James the First of England, to Jehan Guire, the Mighty Emperor of India, commonly called the Great Mogol. Containing an account of his voyage to that country, and his observations there. Taken from his original manuscript. See pages 3-5. [Roe visited Socotra 24-31 August, probably in 1615]. London: Longman, Hurst, Rees, Orme and Brown.[742]

Piovano, G. (1954). Contributo alla conoscenza della flora dell'Africa Orientale. I. Compositae. See page 653. Webbia 10(2): 647-666.[743]

Pittino, R. (1984). Insects of Arabia. Coleoptera Scarabaeoidea: A revision of the family Aphodiidae. Fauna of Saudi Arabia 6: 267-360.[1096]

Plowes, D.C.H. (1979). The Stapeliads of North East Africa. Sketch map on page 52A; 40 small monochrome and 16 small colour photographs in 7 plates on pages 34, 36, 38, 40, 42, 45 and 46. Excelsa. The Aloe, Cactus and Succulent Society of Zimbabwe 9: 35-52.[744]

Pocock, R.I. Walker, R.I. and Scott, A. (1903). Arthropoda. Crustacea: Malacostraca. Crustaceans: 211. I. The decapods of Sokotra: 212:215. 1 figure. II. Decapod and sessile-eyed crustaceans from Abd-el-Kuri: 216- 229. By A.O. Walker and A. Scott. Plain Plate XIV A - Crustaceans from Abd-el-Kuri. Depicts 7 species; artist Andrew Scott. Plain Plate XIV B - Crustaceans from Abd-el-Kuri. Depicts 6 species; artist Andrew Scott. In Natural history of Sokotra and Abd-el-Kuri. Editor: Henry O. Forbes. Bulletin of the Liverpool Museums (Special Bulletin): 209-232.[752]

Pocock, R.I. (1888). Description of Scolopendra valida Lucas, with notes on allied species. Annals and Magazine of Natural History, 6th Series 1: 335-340.[745]

Pocock, R.I. (1889). Notes on some Buthidae, new and old. Annals and Magazine of Natural History, 6th Series 3: 334-351.[746]

Pocock, R.I. (1896). On the Arachnida and Myriopoda obtained by Dr. Anderson's collector during Mr. T. Bent's expedition to the Hadramaut, South Arabia, with a supplement upon the scorpions obtained by Dr. Anderson in Egypt and the Eastern Soudan. Journal of the Linnean Society (Zoology), London25: 292-316.[747]

Pocock, R.I. (1899a). The Expedition to Sokotra. III. Descriptions of the new species of scorpions, centipedes, and millipedes. Bulletin of the Liverpool Museums 2(1): 7-9.[748]

Pocock, R.I. (1899b). The Expedition to Sokotra. VII. Descriptions of one new genus and four new species of spiders. Bulletin of the Liverpool Museums 2(2): 40-42.[749]

Pocock, R.I. (1903a). Arthropoda. Arachnida. Scorpions and spiders: 177. [I]. The scorpions and spiders of Sokotra: 178-201. 2 figures. [II]. Scorpions and spiders of Abd-el-Kuri: 202-205. Colour Plate XIV - Spiders from Sokotra and Abd-el-Kuri. Depicts Monocentropus balfouri, Nephila sumtuosa, Argyope clarkii and Areneus cardioceros; artist F.O. Picard-Cambridge. Colour Plate XXIV - Centipedes and spiders from Socotra. In Natural history of Sokotra and Abd-el-Kuri. Editor: Henry O. Forbes. Bulletin of the Liverpool Museums (Special Bulletin): 175-208.[750]

Pocock, R.I. (1903b). Arthropoda. Myriapoda. The centipedes and millepedes of Sokotra and Abd-el-Kuri. Centipedes and millepedes: 429-430. I. The centipedes and millepedes of Sokotra: 430-438. II. The centipedes of Abd-el-Kuri: 439. Colour Plate XXVI - Centipedes and spiders from Sokotra; depicts 5 species including Scolopendra balfouri; artist F.O. Pickard - Cambridge; opposite p 208. In Natural history of Sokotra and Abd-el-Kuri. Editor: Henry O. Forbes. Bulletin of the Liverpool Museums (Special Bulletin): 427-439.[751]

Polhill, R.M. (1968). Miscellaneous notes on African species of Crotalaria L.: II. 31 figures; 28 line drawings, artists Mary A. Grierson and Roger Polhill; 4 maps; 4 tables. Kew Bulletin 22(2): 169-348.[754]

Pont, A.C. (1991). A review of the Fanniidae and Muscidae (Diptera) of the Arabian Peninsula. See pp 325, 329-330, 333-334, 337, 352-353, 358-359. Fauna of Saudi Arabia: 12: 312-365.[755]

Popescu-Gorj A. and Constantinescu, A. (1977). Revision of the genus Euclasta (Lepidoptera, Pyraustinae). A taxonomic and zoo-geographic study. Travaux de Museum d'Histoire Naturelle 'Grigore Antipa', Bucharest 18: 157-246.[756]

Popov, G.B. (1984). Insects of Saudi Arabia. Orthoptera: Fam. Stenopelmatidae and Gryllacrididae. Fauna of Saudi Arabia 6: 175-202.[1094]

Popov, G.B. (1997). Arabian grasshoppers (Orthoptera): Families Pamphagidae (Eumastacoidea) and Pyrgomorphidae (Acridoidea). Fauna of Saudi Arabia 16: 111-168.[1095]

Popov, G.B. (1957). The vegetation of Socotra. 18 habitat photographs on 5 plates (Plates 55-59); 1 map; 1 table; Plant species list by J.B. Gillett. Journal of the Linnean Society (Botany), London 55(362): 706-720.[757]

Popov, G.B. (1981). Insects of Saudi Arabia. Orthoptera: Fam. Tettigoniidae (Bush Crickets). 72 figures; 3 colour and 8 monochrome photographs; 1 map; 5 tables. See pages 120-135. Fauna of Saudi Arabia 3: 114-148.[758]

Porter, R.[F.] and Martins, R.[P.] (1993). OSME in southern Yemen and Socotra. Bulletin of the Ornithologists Society of the Middle-East. Autumn 1993 31: 1-4.[759]

Porter, R.F. and Martins, R.P. (Editors) (1996a). Southern Yemen and Socotra. The report of the OSME survey in spring 1993. With editorial assistance from Francine Stone, Ben Hoare, J.W. Spencer and Mark Boyd. Sandgrouse 17. Supported by Birdlife International. ISBN 0260-4736; pp 188; 2 figures: 38 colour photographs (Plates 1-38) of habitats and birds (Plates 9-14 show plants and habitats on Socotra, Plates 22-38 show Socotran birds); 3 maps; 3 tables. Sandy, Bedfourdshire: The Ornithological Society of the Midde East.[761]

Porter, R.F. and Martins, R.P. and Stone, Francine. (1996). The Ornithological Society of the Middle East's survey of southern Yemen and Socotra, March-May 1993: an introduction. 2 maps [1 of Socotra]; Sandgrouse 17: 5-14.[762]

Porter, R.F. and Martins, R.P. (1996). The Socotran Starling Onychognathus frater and Somali Starling O. blythii. 2 colour photographs (Plates 33 & 34). Sandgrouse 17: 151-154.[760]

Porter, R.F. and Stone, Francine. (1996). An introduction to Socotra and its birds. 1 map. Sandgrouse 17: 73-80.[763]

Porter, R.F., Christensen, C. and Schiermaker-Hansen, P. (1996). Field Guide to the Birds of the Middle East. London: Poyser.[1036]

Porter, R.F., Dymond, J.N., and Martins, R.P. (1996). Forbes-Watson's Swift Apus berliozi in Socotra. 2 colour photographs (Plates 25 & 26). Sandgrouse 17: 138-141.[764]

Powell, E.A. (1925). Beyond the utmost purple rim. pp xx + 431; 114 sepia photographs; 2 maps. See page 129, 321-322. London: John Long Ltd.[765]

Prestage, E. (1933). The Portuguese pioneers. pp xiv + 352. London: A. & C. Black Ltd.[766]

Price, A.R.G. (1982). Echinoderms of Saude Arabia. Comparison between Echinoderm faunas of Arabian Gulf, SE Arabia, Red Sea and Gulfs of Aquaba and Suez. 2 figures; 1 map; 3 tables Fauna of Saudi Arabia 4: 3-21.[767]

Printzen, C. and Mies, B. (1994). Impressions from a lichenological field-trip to Socotra. International Lichenology Newsletter, Berlin 27: 24-25.[768]

Prout, L.B. (1928). New Geometridae. Novitates Zoologicae. A Journal of Zoology in Connection with the Tring Museum 34(2): 53-70.[769]

Puff, C. (1988). Observations on Carphalea Juss. (Rubiaceae, Hedyotideae), with particular reference to the Madagascan taxa and its taxonomic position. 15 figures (45 photographs, 2 maps, 3 line drawings, 1 graph). Bulletin du Jardin botanique national de Belgique 58(3-4): 271-323.[770]

Pócs, T. (1982). Hepaticological exploration of Subsaharan Africa. 2 maps; 1 table. See maps 1 and 2; table 1. In Bryophyte taxonomy. Methods, practices and floristic exploration. Editors: Patricia Geissler and S.W. Greene. Proceedings of the International Association of Bryologists Taxonomic Workshop meeting, Geneve. 27 Aug. - 2 Sept. 1979. Nova Hedwigia. Zeitschrift für Kryptogamenkunde, Berlin 71: 495-500.[753]