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¹ Department of Wildlife and Fisheries Sciences, Texas A&M University, 2258 TAMU, College Station, Texas 77843, USA;
² Department of Entomology, Texas A&M University, 2475 TAMU, College Station, Texas 77843, USA
⁵ Corresponding author (email: glproudfoot{at}vassar.edu)

ABSTRACT:   While banding ferruginous pygmy-owls (Glaucidium brasilianum) and Eastern screech-owls (Megascops asio) in south Texas during 2004, we recorded Philornis mimicola (Diptera: Muscidae) and Ornithodoros concanensis (Acari: Argasidae) parasitizing nestlings. Inspection of nestlings revealed 54 P. mimicola and one O. concanensis. Inspection of nest material revealed 111 P. mimicola, including 57 puparia. The effect (e.g., blood loss, anemia) of these hematophagous parasites might have contributed to the demise of at least one Eastern screech-owl nestling. This is the first record of P. mimicola and O. concanensis parasitizing ferruginous pygmy-owls and Eastern screech-owls.
  Key words:  Glaucidium, Megascops, Ornithodoros, Philornis, pygmy-owl, screech-owl.

³ Current address: 124 Raymond Ave., Box 351, Vassar College, Poughkeepsie, New York 12604, USA

⁴ Current address: University of California at Riverside, Riverside, California 92521