An Annotated Catalog of the Leiodidae (Coleoptera) of the Nearctic Region (Continental North America North of Mexico) Author Peck, Stewart B. Author Newton, Alfred F. text The Coleopterists Bulletin 2017 2017-06-27 71 2 211 258 http://dx.doi.org/10.1649/0010-065x-71.2.211 journal article 10.1649/0010-065X-71.2.211 1938-4394 5460664 Platypsyllidae Ritsema, 1869b :[38] [stem: Platypsyll -]. Type genus: Platypsyllus Ritsema, 1869 . Notes. Worldwide, the subfamily contains only four genera: Leptinus Müller with six Palearctic and three Nearctic species; Leptinillus Horn with two Nearctic species; Silphopsyllus Olsufiev with one Palearctic species; and Platypsyllus with one Holarctic species. The extreme flea- or louse-like modifications of Platypsyllus , for living in the fur of beaver, led to its original placement in a separate family and order. The platypsyllines may be allied with the Cholevinae and share derived family characters of Leiodidae , so they may be suitably placed as a subfamily of the Leiodidae (Lawrence and Newton 1982, 1995). The unusual biology and morphology of this small ectoparasitic subfamily has stimulated a disproportionate number of research publications. Distribution. Holarctic. = Leptinidae LeConte, 1872: 802 [stem: Leptin -]. Type genus: Leptinus Müller, 1817 . Comment. This family-group name has been attributed to LeConte (1866) in the literature. However, Leconte (1866) did not give a name to the implied new taxon, and therefore it is not available (Newton and Thayer (1992). =Achreioptera Westwood, 1869: 118 (as order; unavailable, not based on a genus; for Platypsyllus Westwood, 1869 , not Ritsema, 1869). = Platypsyllidae LeConte, 1872: 799 . Type genus: Platypsyllus Ritsema, 1869 .