The Ischnoceran genus Mulcticola Clay and Meinertzhagen, 1938, contains five forms found on the avian family Caprimulgidae. The known species, and type host, are: M. hypoleucus (Denny), 1842, found on Caprimulgus europaeus europaeus Linnaeus; M. macrocephalus (Kellogg), 1896, found on Chordeiles minor henryi Cassin; M. nacunda nacunda Carriker, 1945, found on Podager nacunda minor Cory; M. nacunda peruviana Carriker, 1945, type host is unknown (presumed to be a member of the Caprimulgidae); and M. tenuiceps Carriker, 1945, found on Podager nacunda nacunda (Vieillot). A new species is described from material collected by one of the authors while assigmed to the United States Operations Mission to Thailand. The other new species is described from material in the British Museum (Natural History), which was graciously loaned by Dr. Theresa Clay. Appreciation is also expressed to the United Staces National Museum and to the Snow Entomological Museum of Kansas University for the loan of specimens.