The Muscidae (Diptera) of Saudi Arabia, descriptions of two new species, new records and updated list of species Author Dawah, Hassan A. Centre for Environmental Research and Studies, Jazan University, P. O. Box 2095, Jazan, Kingdom of Saudi Arabia. Author Abdullah, Mohammed A. 0000-0002-3323-3623 Department of Biology, College of Science, King Khalid University, PO Box 9004, Abha- 61413, Kingdom of Saudi Arabia. mohd _ robiya @ hotmail. com; https: // orcid. org / 0000 - 0002 - 3323 - 3623 mohd_robiya@hotmail.com Author Deeming, John C. 0000-0002-6703-8180 National Museum of Wales, Department of Natural Sciences, Entomology Section, Cardiff, CF 10 3 NP, UK. john. deeming @ museumwales. ac. uk; https: // orcid. org / 0000 - 0002 - 6703 - 8180 john.deeming@museumwales.ac.uk text Zootaxa 2020 2020-10-30 4869 1 1 54 journal article 8861 10.11646/zootaxa.4869.1.1 c285848a-ccaf-4f48-8e05-7f9cf6acf225 1175-5326 4418246 C34E9D0C-336A-4F4B-A670-2F342470839D Passeromyia heterochaeta ( Villeneuve, 1915 ) ( Fig. 17 ) Muscina heterochaeta Villeneuve, 1915: 225 . Specimen examined. 1m , Jazan , Abu Aresh , Al-Mahdag Village , Malaise trap , 1.ii.–3.vi.2011 , H.A. Dawah ( RCES ); 1f, Asir , Abha, Hay Al-Menhel, 19.ii.2014 , sweeping, H.A. Dawah ( CERS ) Distribution. New to Saudi Arabia . It was described from Zambia . Biological remarks. The larvae of this species ingest the blood of living nestling birds and may cause their death if the infestation of the nests is heavy. The larva may penetrate the cavities of the bodies of the nestlings to get enough blood-supply for development ( Patton 1920 ). Zumpt (1965) summarized the existing knowledge on the biology and life cycle of P. heterochaeta .