Phthitia is a subgenus of flies belonging to the family Sphaeroceridae.
Species P. alexandri Richards, 1955 P. charpentieri Marshall & Smith, 1995 P. cortesi Marshall & Smith, 1995 P. gonzalezi Marshall & Smith, 1995 P. miradorensis Marshall & Smith, 1995 P. sanctaehelenae (Richards, 1951) P. selkirki (Enderlein, 1938) P. venosa Enderlein, 1938
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