| abstract | Two new species and one new genus of pilicolous hypopi (Glycyphagidae) are described in this paper: Xenoryctes latiporus sp. n. from Scalopus aquaticus (typical host) and Spermophilus tridecemlineatus and Scalopacarus obesus g. n., sp. n. from Scalopus aquaticuss. The number of phoretic hypopi known from North American nammals is now 18. Among these, three species are hypopi living in the hair follic1es; the fifteen others are pilicolous hypopi. Besides the two new species two forms of pilicolous hypopi are reported for the first time in North America, Marsupialichus brasiliensis on Didelphis marsupialis, and Labidophorus talpae on Parascalops breweri. Other pilicolous species known from North America are D. hypudaei, D. hylandi, D. newyorkensis, D. sciurimus, D. sylvilagi, D. mexicanus, D. tamiasciuri, D. ondatrae, Marsupialichus jolmstoni, Orycteroxenus soricis and O. canadensis. The three forms living in hair follic1es are Microlabidopus americanus, Aplodontopus latus and A. sciuricola. |