Family ACARIDAE
Caloglyphus spinitarsus (Hermann)
Natural host.—Pycnoscelus surinamensis, Germany (Roeser, 1940): See notes following Histiostoma feroniarum above.
Caloglyphus sp.
Natural hosts.—Blattella germanica and Periplaneta americana, U.S.A. (Piquett and Fales, 1952): Mite feeds on organic matter but can reduce the vigor of a cockroach colony.
Tyrophagus lintneri (Osborne)
Common name.—Mushroom mite.
Associate.—Pycnoscelus surinamensis, U.S.A. (Roth and Willis, unpublished data, 1953): Mite determined by Dr. E. W. Baker (personal communication, 1953). Although this mite was found on the cockroach, it is a known pest in stored foods (Baker and Wharton, 1952) and probably was brought into the culture with food. Rau (1924) reported that the food of Blatta orientalis often became infested with this species, but it did not affect the health or mortality of the cockroaches in his culture.