Perkins R. C. L., 1914: New species of Paralastor, Sauss. (Hymenoptera, fam. Eumenidae). 6 pp. 

 Perkins R. C. L., 1914: On hawaiian Ophioninae (Hymenoptera, Fam. Ichneumonidae). 15 pp. 

 Perkins R. C. L., 1915: Andrena falsifica n. n. for A. moricella, nec. 2 pp. 

 Perkins R. C. L., 1915: Two hermaphroditic specimens of Andrena (A. dorsata K. and A. albicans L.). 2 pp. 

 Perkins R. C. L., 1916: Crabro pubescens, Shuck, and inermis, Thoms., with notes on other British Crabronidae. 3 pp. 

 Perkins R. C. L., 1917: Notes on Callimorpha dominula and Vespa austriaca. 4 pp. 

 Perkins R. C. L., 1917: On a new species of Psammochares (or Pompilus) in England. 2 pp. 

 Perkins R. C. L., 1918: Further notes on Stylops and stylopized bees. 15 pp. 

 Perkins R. C. L., 1918: Halictoxenus arnoldi, an undescribed British stylopid. 2 pp. 

 Perkins R. C. L., 1918: The synonymy of Andrena wilkella K., and its allies, with notes on habits, as confirming specific distinctions. 4 pp. 

 Perkins R. C. L., 1920: Notes on British Psammocharidae (Pompilidae). 7 pp. 

 Perkins R. C. L., 1921: Two new species of bees of the genus Sphecodes. 3 pp. 

 Perkins R. C. L., 1922: Halictus tumulorum L. and flavipes F. and some allied species. 3 pp. 

 Perkins R. C. L., 1922: Some instances of Hermaphoritism in bees and wasps. 6 pp. 

 Perkins R. C. L., 1922: Sphecodes scabricollis Wesm. in Somerset, and description of S. kershawi Perk. 3 pp. 

 Perkins R. C. L., 1929: Notes on some British aculeate Hymenoptera, including five species new to Britain. 5 pp. 

 Perkins R. C. L., 1930: A revision of the British species of Dolerus Jurine (Hymenoptera Phytophaga). 14 pp. 

 Perkins R. C. L., 1933: Further notes on some British species of Dolerus. 2 pp. 

 Perkins R. C. L., 1935: A note on some British species of Halictus. 3 pp. 

 Perkins R. C. L., : Insects at Kilauea, Hawaii. 10 pp. 

 Perkins R. C. L., : Sawflies, with a list of the Species that have occurred in Devonshire. 9 pp. 

 Perkins R. C. L., Sharp D., 1902: On the generic characters of Hawaiian Crabronidae; four new genera characterized. 4 pp. 

 Perna B., Piccioli M. T. M., Turillazzi S., 1978: Osservazioni sulla poliginia di Polistes foederatus (Kohl) (Hymenoptera, Vespidae) indotta in cattivita. 9 pp. 

 Perttunen V., 1955: Reactions of the carpenter ant, Camponotus herculeanus (Hym., Formicida), to air humidity. 8 pp. 

 Péru L., Plateaux L., Buschinger A., Douwes P., Perramon A., Quentin J. C., 1990: New record of Leptothorax ants with cysticercoids of the cestode, Choanotaenia unicoronata, and the rearing of the tapeworm in quails. 3 pp. (in English). Spixiana 13(2): 223-225.

 Péru L., Plateaux L., Buschinger A., Douwes P., Perramon A., Quentin J. C., 1990: New record of Leptothorax ants with cysticercoids of the cestode, Choanotaenia unicoronata, and the rearing of the tapeworm in quails. 3 pp. (in English). [HYM7483] Spixiana 13(2): 223-225.

 Peruquetti R. C., Campos L. A. O., 1997: Aspectos da biologia de Euplusia violacea (Blanchard) (Hymenoptera, Apidae, Euglossini). 8 pp. Revta bras. Zool. 14(1): 91-98.

 Peruquetti R. C., Campos L. A. O., Coelho C. D. P., Abrantes C. V. M., Lisboa L. C. O., 1999: Abelhas Euglossini (Apidae) de áreas de Mata Atlantica: abundancia, riqueza e aspectos biológicos. 18 pp. Revta bras. Zool. 16(Supl. 2): 101-118.

 Pesarini C., Pesarini F., 1992: Ametastegia lacteilabris (Costa), specie valida affine a glabrata (Fallén) (Hymenoptera Tenthredinidae). 6 pp. Bolletino della Societa Entomologica Italiana 124(1): 43-48.

 Pesarini F., 1998: Tenthredella nympha, new species from Italy related to cunyi (Konow, 1886) (Hymenoptera: Tenhredinidae). 7 pp. Annali del Museo Civico di Storia Naturale di Ferrara 1: 69-75.

 Pesarini F., 1999: Taxonomical remarks on the European species of Pleroneura Konow, 1897 (Hymenoptera, Symphyta, Xyelidae). 6 pp. [M44] Annali del Museo Civico di Storia Naturale di Ferrara 2: 69-74.

 Pesarini F., 2001: Imenotteri sinfiti raccolti in Sardegna e conservati nelle collezioni dell’Istituto di Entomologia Agraria dell’Universita di Sassari (Hymenoptera Symphyta). 13 pp. Ann. Mus. civ. St. nat. Ferrara 4: 117-129.

 Pesarini F., Turrisi G. F., 2001: Contributo alla conoscenza dei sinfiti di Sicilia (Hymenoptera Symphyta). 39 pp. Memorie della Societá Entomologica Italiana 80: 183-221.

 Pesenko Y. A., 2005: New data on the taxonomy and distribution of the Palaearctic halictids: genus Halictus Latreille (Hymenoptera: Halictidae). 36 pp. Entomofauna 26/18: 313-348.

 Pesenko Y. A., Astafurova Y. V., 2006: Contributions to the halictid fauna of the Eastern Palaearctic Region: subfamily Rophitinae (Hymenoptera: Halictidae). 40 pp.  Entomofauna 27/27: 317-356.

 Pesenko Yu. A., 1977: Pčelinye roda Nomioides Schenck (Hymenoptera, Halictidae) iz Mongolii. 3 pp. [HYM 3056] Nasekomye Mongolii 5: 583-585.

 Pesenko Yu. A., 1984: A subgeneric classification of bees of the genus Halictus Latreille sensu stricto (Hymenoptera, Halictidae). 18 pp. (in Russian). Entomologitsheskoe obozrenie 63(2): 340-357.

 Pesenko Yu. A., 1984: Pčely roda Halictus Latreille sensu stricto (Hymenoptera, Halictidae) Mongolii i Severo-zapadnogo Kitaja, s obzorom publikacij po Halictini etogo rajona i reviziej podroda Prohalictus v objeme mirovoj fauny. 36 pp. [51821] Nasekomye Mongolii 9: 446-481.

 Pesenko Yu. A., 1984: Pčely triby Nomioidini (Hymenoptera, Halictidae) fauny Mongolii: dopolnenija i utočnenija. 2 pp. [HYM 3057] Nasekomye Mongolii 9: 482-483.

 Pesenko Yu. A., 1986: Systematics of bees of the genus Halictus Latreille (Hymenoptera, Halictidae) with description of the 7th and 8th metasomal sterna of males. Subgenus Tytthalictus Pesenko. 15 pp. (in Russian). Entomologitsheskoe obozrenie 65(3): 618-632.

 Pesenko Yu. A., 1997: Nomenclatural and bibliographic corrections to A. Pauly’s monograph on African Nomiinae (Hymenoptera: Halictidae). 32 pp. Entomofauna 18/29: 477-508.

 Pesenko Yu. A., Banaszak J., Cierzniak T., 2002: Hymenoptera: Apidae: Halictinae. Klucze owadów Polski XXIV(68b). 111 pp.  Discount 50%!

 Pesenko Yu. A., Radchenko V. G., 1992: Application of bees (Hymenoptera, Apoidea) for alfalfa pollination: the main paths, complex of manners, methods for evaluation of populations of wild bees and pollinator efficiency. 18 pp. (in Russian). Entomologitsheskoe obozrenie 71(2): 249-266.

 Pesenko Yu. A., Radchenko V. G., Kaigorodova M. S., 1980: Pollination ecology of Strigosella grandiflora and Erysimum badghysi (Brassicaceae) by bees (Hymenoptera, Apoidea) in Badhyz: estimation of a degree of the competition relationships. 15 pp. (in Russian). Entomologitsheskoe obozrenie 59(4): 768-782.

 Petal J. M., 1963: Materialy do znajomosci mrówek (Formicidae, Hymenoptera) Lubelszczyzny (V – VI). 10 pp. Fragmenta Faunistica 10/31: 463-472.

 Petal J., 1961: Materialy do znajomosci mrówek (Formicidae) Lubelszczyzny (I-IV). 17 pp. Fragmenta Faunistica 9/12: 135-151.

 Peters D. S., 1968: Ein „gemischtes“ Wespennest. 8 pp. 

 Peters D. S., 1969: Phänokopierende Mißbildungen des Flügelgeäders bei akuleaten Hymenopteren. 8 pp. [HYM 3059] Deutsche Entomologische Zeitschrift (N.F.) 16: 367-374.

 Peters D. S., 1970: Die Stellung von Heriadopsis Cockerell 1931 (Insecta: Hymenoptera: Apoidea: Megachilidae). 5 pp. [HYM 6886] Senckenbergiana biologica 51(3/4): 199-203.

 Peters D. S., 1970: Merkmalswertung und Systematik. 8 pp. [HYM 6888] Entomologische Zeitschrift 80(5): 29-36.